366 relations: Abstract index notation, Acceleration, Accretion (astrophysics), Active galactic nucleus, ADM formalism, AdS/CFT correspondence, Albert Einstein, Alcubierre drive, Alexander Friedmann, Alternatives to general relativity, Angular momentum, Anisotropy, Anti-de Sitter space, Apparent horizon, Apsidal precession, Apsis, Arthur Eddington, Ashtekar variables, Astrophysical jet, Astrophysics, Atomic clock, Background independence, Baryon, Big Bang, Big Bang (book), Big Bang nucleosynthesis, Big Crunch, Binary black hole, Binary pulsar, Binary system, BKL singularity, Black hole thermodynamics, Blueshift, Brans–Dicke theory, Canonical quantization, Causal dynamical triangulation, Causal sets, Caustic (mathematics), Center of mass, Center of mass (relativistic), Charge (physics), Charged black hole, Classical limit, Classical mechanics, Classical physics, Closed timelike curve, Compactification (mathematics), Compactification (physics), Conformal geometry, Connection (mathematics), ..., Conservation of energy, Coordinate conditions, Coordinate system, Cosmic Background Explorer, Cosmic background radiation, Cosmic censorship hypothesis, Cosmic distance ladder, Cosmic string, Cosmological constant, Covariant derivative, Curvature, Curvature form, Dark energy, Dark matter, De Sitter universe, Density, Derivations of the Lorentz transformations, Differential geometry, Divergence, Double star, Eötvös experiment, Eddington luminosity, Edwin Hubble, Effective field theory, Ehrenfest paradox, Eikonal approximation, Einstein field equations, Einstein ring, Einstein tensor, Einstein's thought experiments, Einstein–Cartan theory, Einstein–Hilbert action, Electric charge, Electric field, Electricity, Electromagnetic radiation, Electromagnetic spectrum, Electromagnetism, Elementary particle, Ellipse, Energy, Energy condition, Energy density, Entropy, Equation of state, Equivalence principle, Ergosphere, Euclidean geometry, Euclidean space, Event (relativity), Event horizon, Exact solutions in general relativity, Existence theorem, Expansion of the universe, Experimental data, F(R) gravity, Field equation, Flatness problem, Force, Force carrier, Four-momentum, Fourier series, Frame of reference, Frame-dragging, Francis Bacon, Free fall, Friction, Friedmann–Lemaître–Robertson–Walker metric, Galaxy, Galilean invariance, Gauge fixing, Gödel metric, General covariance, General relativity, General Relativity (book), GEO600, Geodesic, Geodesics in general relativity, Geodetic effect, Geometry, Georges Lemaître, Geroch energy, Global Positioning System, Gowdy solution, Gradient, Gravitation (book), Gravitational constant, Gravitational lens, Gravitational microlensing, Gravitational potential, Gravitational redshift, Gravitational singularity, Gravitational time dilation, Gravitational wave, Gravitational-wave astronomy, Gravitational-wave observatory, Graviton, Gravity, Gravity Probe A, Gravity Probe B, Gravity well, Gyroscope, Hafele–Keating experiment, Hawking energy, Hawking radiation, Hertz, History of string theory, Homogeneity (physics), Hoop Conjecture, Horizon problem, Hubble's law, Hulse–Taylor binary, Inertia, Inertial frame of reference, Inflation (cosmology), Inflaton, Institut Henri Poincaré, Integrable system, Interferometric gravitational wave detector, Introduction to the mathematics of general relativity, Invariant (mathematics), Isolated system, Isotropy, John Archibald Wheeler, John C. Baez, Joseph Hooton Taylor Jr., Karl Schwarzschild, Kerr metric, Komar mass, Kurt Gödel, LAGEOS, Lagrangian (field theory), Lane P. Hughston, Laser Interferometer Space Antenna, Laws of thermodynamics, Leonard Susskind, Levi-Civita connection, Light-year, LIGO, Limiting case (philosophy of science), Linearized gravity, LISA Pathfinder, List of contributors to general relativity, List of gravitational wave observations, Living Reviews in Relativity, Local reference frame, Local spacetime structure, Loop quantum gravity, Loránd Eötvös, Lorentz covariance, Lunar Laser Ranging experiment, M-theory, Magnetic field, Manifold, Mars Global Surveyor, Mass, Matter, Max Planck Institute for Gravitational Physics, Mercury (planet), Metric tensor (general relativity), Microquasar, Milky Way, Millisecond pulsar, Minkowski diagram, Minkowski space, Modern physics, Momentum, Naked singularity, National Center for Supercomputing Applications, Negative mass, Neutron star, Newton's law of universal gravitation, Newton's laws of motion, Newton–Cartan theory, No-hair theorem, Nobel Prize, Nonlinear system, Normal mode, Numerical integration, Numerical relativity, Observational astronomy, Occam's razor, Orbit, Orbital eccentricity, Orbital period, Order of magnitude, Parallel transport, Parameterized post-Newtonian formalism, Partial differential equation, Particle horizon, Particle physics, Path integral formulation, Penrose diagram, Penrose process, Penrose–Hawking singularity theorems, Perturbation theory, Physical body, Physical cosmology, Physical law, Planck's law, Planet, Poincaré group, Point particle, Polarization (waves), Post-Newtonian expansion, Potential, Pound–Rebka experiment, Precession, Pressure, Principle of relativity, Proper time, Prussian Academy of Sciences, Pseudo-Riemannian manifold, PSR J0737-3039, Pulsar, Pulsar timing array, Quantum cosmology, Quantum field theory, Quantum gravity, Quantum mechanics, Quasar, Radiation, Raychaudhuri equation, Redshift, Regge calculus, Reissner–Nordström metric, Relativity priority dispute, Renormalization, Ricci calculus, Ricci curvature, Riemann curvature tensor, Rindler coordinates, Roger Penrose, Rose (mathematics), Russell Alan Hulse, Scalar curvature, Scalar field, Schrödinger equation, Schwarzschild metric, Schwarzschild radius, Science (journal), Scientific theory, Self-energy, Semi-major and semi-minor axes, Shapiro time delay, Solar eclipse of May 29, 1919, Solar mass, Solar System, Solid-state physics, Solutions of the Einstein field equations, Space, Spacecraft, Spacetime, Spacetime topology, Special relativity, Speed of light, Spin network, Stanford University, Star, Static spacetime, Stationary spacetime, Stellar black hole, Stellar collision, Stellar evolution, Stress (mechanics), Stress–energy tensor, String theory, Subrahmanyan Chandrasekhar, Sun, Supergravity, Superluminal motion, Supermassive black hole, Supernova, Superposition principle, Supersymmetry, Symmetry, TAMA 300, Taub–NUT space, Teleparallelism, Tensor, Test particle, Tests of general relativity, The Large Scale Structure of Space-Time, Theoretical physics, Theory of everything, Theory of relativity, Thermal radiation, Thought experiment, Tidal force, Time evolution, Time in physics, Time travel, Timeline of gravitational physics and relativity, Tipler cylinder, Torsion tensor, Trajectory, Transponder, Trapped surface, Twin Quasar, Twistor theory, Two-body problem in general relativity, Universe, Unruh effect, Urbain Le Verrier, Venus, Very-long-baseline interferometry, Virgo interferometer, Weak gravity conjecture, Wheeler–DeWitt equation, Whitehead's theory of gravitation, Wilkinson Microwave Anisotropy Probe, WKB approximation, World line, X-ray burster, X-ray pulsar, 1,000,000,000. Expand index (316 more) »

## Abstract index notation

Abstract index notation is a mathematical notation for tensors and spinors that uses indices to indicate their types, rather than their components in a particular basis.

New!!: General relativity and Abstract index notation · See more »

## Acceleration

In physics, acceleration is the rate of change of velocity of an object with respect to time.

New!!: General relativity and Acceleration · See more »

## Accretion (astrophysics)

In astrophysics, accretion is the accumulation of particles into a massive object by gravitationally attracting more matter, typically gaseous matter, in an accretion disk.

New!!: General relativity and Accretion (astrophysics) · See more »

## Active galactic nucleus

An active galactic nucleus (AGN) is a compact region at the center of a galaxy that has a much higher than normal luminosity over at least some portion—and possibly all—of the electromagnetic spectrum, with characteristics indicating that the excess luminosity is not produced by stars.

New!!: General relativity and Active galactic nucleus · See more »

## ADM formalism

The ADM formalism (named for its authors Richard Arnowitt, Stanley Deser and Charles W. Misner) is a Hamiltonian formulation of general relativity that plays an important role in canonical quantum gravity and numerical relativity.

New!!: General relativity and ADM formalism · See more »

## AdS/CFT correspondence

In theoretical physics, the anti-de Sitter/conformal field theory correspondence, sometimes called Maldacena duality or gauge/gravity duality, is a conjectured relationship between two kinds of physical theories.

New!!: General relativity and AdS/CFT correspondence · See more »

## Albert Einstein

Albert Einstein (14 March 1879 – 18 April 1955) was a German-born theoretical physicist who developed the theory of relativity, one of the two pillars of modern physics (alongside quantum mechanics).

New!!: General relativity and Albert Einstein · See more »

## Alcubierre drive

The Alcubierre drive or Alcubierre warp drive (or Alcubierre metric, referring to metric tensor) is a speculative idea based on a solution of Einstein's field equations in general relativity as proposed by Mexican theoretical physicist Miguel Alcubierre, by which a spacecraft could achieve apparent faster-than-light travel if a configurable energy-density field lower than that of vacuum (that is, negative mass) could be created.

New!!: General relativity and Alcubierre drive · See more »

## Alexander Friedmann

Alexander Alexandrovich Friedmann (also spelled Friedman or Fridman; Алекса́ндр Алекса́ндрович Фри́дман) (June 16, 1888 – September 16, 1925) was a Russian and Soviet physicist and mathematician.

New!!: General relativity and Alexander Friedmann · See more »

## Alternatives to general relativity

Alternatives to general relativity are physical theories that attempt to describe the phenomenon of gravitation in competition to Einstein's theory of general relativity.

New!!: General relativity and Alternatives to general relativity · See more »

## Angular momentum

In physics, angular momentum (rarely, moment of momentum or rotational momentum) is the rotational equivalent of linear momentum.

New!!: General relativity and Angular momentum · See more »

## Anisotropy

Anisotropy, is the property of being directionally dependent, which implies different properties in different directions, as opposed to isotropy.

New!!: General relativity and Anisotropy · See more »

## Anti-de Sitter space

In mathematics and physics, n-dimensional anti-de Sitter space (AdSn) is a maximally symmetric Lorentzian manifold with constant negative scalar curvature.

New!!: General relativity and Anti-de Sitter space · See more »

## Apparent horizon

In general relativity, an apparent horizon is a surface that is the boundary between light rays that are directed outwards and moving outwards, and those directed outward but moving inward.

New!!: General relativity and Apparent horizon · See more »

## Apsidal precession

In celestial mechanics, apsidal precession or orbital precession is the precession (rotation) of the orbit of a celestial body.

New!!: General relativity and Apsidal precession · See more »

## Apsis

An apsis (ἁψίς; plural apsides, Greek: ἁψῖδες) is an extreme point in the orbit of an object.

New!!: General relativity and Apsis · See more »

## Arthur Eddington

Sir Arthur Stanley Eddington (28 December 1882 – 22 November 1944) was an English astronomer, physicist, and mathematician of the early 20th century who did his greatest work in astrophysics.

New!!: General relativity and Arthur Eddington · See more »

## Ashtekar variables

In the ADM formulation of general relativity, spacetime is split into spatial slices and a time axis.

New!!: General relativity and Ashtekar variables · See more »

## Astrophysical jet

An astrophysical jet is an astronomical phenomenon where outflows of ionised matter are emitted as an extended beam along the axis of rotation.

New!!: General relativity and Astrophysical jet · See more »

## Astrophysics

Astrophysics is the branch of astronomy that employs the principles of physics and chemistry "to ascertain the nature of the astronomical objects, rather than their positions or motions in space".

New!!: General relativity and Astrophysics · See more »

## Atomic clock

An atomic clock is a clock device that uses an electron transition frequency in the microwave, optical, or ultraviolet region of the electromagnetic spectrum of atoms as a frequency standard for its timekeeping element.

New!!: General relativity and Atomic clock · See more »

## Background independence

Background independence is a condition in theoretical physics, that requires the defining equations of a theory to be independent of the actual shape of the spacetime and the value of various fields within the spacetime.

New!!: General relativity and Background independence · See more »

## Baryon

A baryon is a composite subatomic particle made up of three quarks (a triquark, as distinct from mesons, which are composed of one quark and one antiquark).

New!!: General relativity and Baryon · See more »

## Big Bang

The Big Bang theory is the prevailing cosmological model for the universe from the earliest known periods through its subsequent large-scale evolution.

New!!: General relativity and Big Bang · See more »

## Big Bang (book)

Big Bang: The most important scientific discovery of all time and why you need to know about it is a book written by Simon Singh and published in 2004 by Fourth Estate.

New!!: General relativity and Big Bang (book) · See more »

## Big Bang nucleosynthesis

In physical cosmology, Big Bang nucleosynthesis (abbreviated BBN, also known as primordial nucleosynthesis, arch(a)eonucleosynthesis, archonucleosynthesis, protonucleosynthesis and pal(a)eonucleosynthesis) refers to the production of nuclei other than those of the lightest isotope of hydrogen (hydrogen-1, 1H, having a single proton as a nucleus) during the early phases of the Universe.

New!!: General relativity and Big Bang nucleosynthesis · See more »

## Big Crunch

The Big Crunch is one possible scenario for the ultimate fate of the universe, in which the metric expansion of space eventually reverses and the universe recollapses, ultimately causing the cosmic scale factor to reach zero or causing a reformation of the universe starting with another Big Bang.

New!!: General relativity and Big Crunch · See more »

## Binary black hole

A binary black hole (BBH) is a system consisting of two black holes in close orbit around each other.

New!!: General relativity and Binary black hole · See more »

## Binary pulsar

A binary pulsar is a pulsar with a binary companion, often a white dwarf or neutron star.

New!!: General relativity and Binary pulsar · See more »

## Binary system

A binary system is a system of two astronomical bodies which are close enough that their gravitational attraction causes them to orbit each other around a barycenter (also see animated examples).

New!!: General relativity and Binary system · See more »

## BKL singularity

A Belinsky-Khalatnikov-Lifshitz (BKL) singularity is a model of the dynamic evolution of the Universe near the initial singularity, described by an anisotropic, homogeneous, chaotic solution to Einstein's field equations of gravitation.

New!!: General relativity and BKL singularity · See more »

## Black hole thermodynamics

In physics, black hole thermodynamics is the area of study that seeks to reconcile the laws of thermodynamics with the existence of black-hole event horizons.

New!!: General relativity and Black hole thermodynamics · See more »

## Blueshift

A blueshift is any decrease in wavelength, with a corresponding increase in frequency, of an electromagnetic wave; the opposite effect is referred to as redshift.

New!!: General relativity and Blueshift · See more »

## Brans–Dicke theory

In theoretical physics, the Brans–Dicke theory of gravitation (sometimes called the Jordan–Brans–Dicke theory) is a theoretical framework to explain gravitation.

New!!: General relativity and Brans–Dicke theory · See more »

## Canonical quantization

In physics, canonical quantization is a procedure for quantizing a classical theory, while attempting to preserve the formal structure, such as symmetries, of the classical theory, to the greatest extent possible.

New!!: General relativity and Canonical quantization · See more »

## Causal dynamical triangulation

Causal dynamical triangulation (abbreviated as CDT) theorized by Renate Loll, Jan Ambjørn and Jerzy Jurkiewicz, and popularized by Fotini Markopoulou and Lee Smolin, is an approach to quantum gravity that like loop quantum gravity is background independent.

New!!: General relativity and Causal dynamical triangulation · See more »

## Causal sets

The causal sets program is an approach to quantum gravity.

New!!: General relativity and Causal sets · See more »

## Caustic (mathematics)

In differential geometry and geometric optics, a caustic is the envelope of rays either reflected or refracted by a manifold.

New!!: General relativity and Caustic (mathematics) · See more »

## Center of mass

In physics, the center of mass of a distribution of mass in space is the unique point where the weighted relative position of the distributed mass sums to zero, or the point where if a force is applied it moves in the direction of the force without rotating.

New!!: General relativity and Center of mass · See more »

## Center of mass (relativistic)

In physics, relativistic center of mass refers to the mathematical and physical concepts that define the center of mass of a system of particles in relativistic mechanics and relativistic quantum mechanics.

New!!: General relativity and Center of mass (relativistic) · See more »

## Charge (physics)

In physics, a charge may refer to one of many different quantities, such as the electric charge in electromagnetism or the color charge in quantum chromodynamics.

New!!: General relativity and Charge (physics) · See more »

## Charged black hole

A charged black hole is a black hole that possesses electric charge.

New!!: General relativity and Charged black hole · See more »

## Classical limit

The classical limit or correspondence limit is the ability of a physical theory to approximate or "recover" classical mechanics when considered over special values of its parameters.

New!!: General relativity and Classical limit · See more »

## Classical mechanics

Classical mechanics describes the motion of macroscopic objects, from projectiles to parts of machinery, and astronomical objects, such as spacecraft, planets, stars and galaxies.

New!!: General relativity and Classical mechanics · See more »

## Classical physics

Classical physics refers to theories of physics that predate modern, more complete, or more widely applicable theories.

New!!: General relativity and Classical physics · See more »

## Closed timelike curve

In mathematical physics, a closed timelike curve (CTC) is a world line in a Lorentzian manifold, of a material particle in spacetime that is "closed", returning to its starting point.

New!!: General relativity and Closed timelike curve · See more »

## Compactification (mathematics)

In mathematics, in general topology, compactification is the process or result of making a topological space into a compact space.

New!!: General relativity and Compactification (mathematics) · See more »

## Compactification (physics)

In physics, compactification means changing a theory with respect to one of its space-time dimensions.

New!!: General relativity and Compactification (physics) · See more »

## Conformal geometry

In mathematics, conformal geometry is the study of the set of angle-preserving (conformal) transformations on a space.

New!!: General relativity and Conformal geometry · See more »

## Connection (mathematics)

In geometry, the notion of a connection makes precise the idea of transporting data along a curve or family of curves in a parallel and consistent manner.

New!!: General relativity and Connection (mathematics) · See more »

## Conservation of energy

In physics, the law of conservation of energy states that the total energy of an isolated system remains constant, it is said to be ''conserved'' over time.

New!!: General relativity and Conservation of energy · See more »

## Coordinate conditions

In general relativity, the laws of physics can be expressed in a generally covariant form.

New!!: General relativity and Coordinate conditions · See more »

## Coordinate system

In geometry, a coordinate system is a system which uses one or more numbers, or coordinates, to uniquely determine the position of the points or other geometric elements on a manifold such as Euclidean space.

New!!: General relativity and Coordinate system · See more »

## Cosmic Background Explorer

The Cosmic Background Explorer (COBE), also referred to as Explorer 66, was a satellite dedicated to cosmology, which operated from 1989 to 1993.

New!!: General relativity and Cosmic Background Explorer · See more »

## Cosmic background radiation

Cosmic background radiation is electromagnetic radiation from the big bang.

New!!: General relativity and Cosmic background radiation · See more »

## Cosmic censorship hypothesis

The weak and the strong cosmic censorship hypotheses are two mathematical conjectures about the structure of singularities arising in general relativity.

New!!: General relativity and Cosmic censorship hypothesis · See more »

## Cosmic distance ladder

The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects.

New!!: General relativity and Cosmic distance ladder · See more »

## Cosmic string

Cosmic strings are hypothetical 1-dimensional topological defects which may have formed during a symmetry breaking phase transition in the early universe when the topology of the vacuum manifold associated to this symmetry breaking was not simply connected.

New!!: General relativity and Cosmic string · See more »

## Cosmological constant

In cosmology, the cosmological constant (usually denoted by the Greek capital letter lambda: Λ) is the value of the energy density of the vacuum of space.

New!!: General relativity and Cosmological constant · See more »

## Covariant derivative

In mathematics, the covariant derivative is a way of specifying a derivative along tangent vectors of a manifold.

New!!: General relativity and Covariant derivative · See more »

## Curvature

In mathematics, curvature is any of a number of loosely related concepts in different areas of geometry.

New!!: General relativity and Curvature · See more »

## Curvature form

In differential geometry, the curvature form describes the curvature of a connection on a principal bundle.

New!!: General relativity and Curvature form · See more »

## Dark energy

In physical cosmology and astronomy, dark energy is an unknown form of energy which is hypothesized to permeate all of space, tending to accelerate the expansion of the universe.

New!!: General relativity and Dark energy · See more »

## Dark matter

Dark matter is a theorized form of matter that is thought to account for approximately 80% of the matter in the universe, and about a quarter of its total energy density.

New!!: General relativity and Dark matter · See more »

## De Sitter universe

A de Sitter universe is a cosmological solution to the Einstein field equations of general relativity, named after Willem de Sitter.

New!!: General relativity and De Sitter universe · See more »

## Density

The density, or more precisely, the volumetric mass density, of a substance is its mass per unit volume.

New!!: General relativity and Density · See more »

## Derivations of the Lorentz transformations

There are many ways to derive the Lorentz transformations utilizing a variety of physical principles, ranging from Maxwell's equations to Einstein's postulates of special relativity, and mathematical tools, spanning from elementary algebra and hyperbolic functions, to linear algebra and group theory.

New!!: General relativity and Derivations of the Lorentz transformations · See more »

## Differential geometry

Differential geometry is a mathematical discipline that uses the techniques of differential calculus, integral calculus, linear algebra and multilinear algebra to study problems in geometry.

New!!: General relativity and Differential geometry · See more »

## Divergence

In vector calculus, divergence is a vector operator that produces a scalar field, giving the quantity of a vector field's source at each point.

New!!: General relativity and Divergence · See more »

## Double star

In observational astronomy, a double star or visual double is a pair of stars that appear close to each other in the sky as seen from Earth when viewed through an optical telescope.

New!!: General relativity and Double star · See more »

## Eötvös experiment

The Eötvös experiment was a famous physics experiment that measured the correlation between inertial mass and gravitational mass, demonstrating that the two were one and the same, something that had long been suspected but never demonstrated with the same accuracy.

New!!: General relativity and Eötvös experiment · See more »

## Eddington luminosity

The Eddington luminosity, also referred to as the Eddington limit, is the maximum luminosity a body (such as a star) can achieve when there is balance between the force of radiation acting outward and the gravitational force acting inward.

New!!: General relativity and Eddington luminosity · See more »

## Edwin Hubble

Edwin Powell Hubble (November 20, 1889 – September 28, 1953) was an American astronomer.

New!!: General relativity and Edwin Hubble · See more »

## Effective field theory

In physics, an effective field theory is a type of approximation, or effective theory, for an underlying physical theory, such as a quantum field theory or a statistical mechanics model.

New!!: General relativity and Effective field theory · See more »

## Ehrenfest paradox

The Ehrenfest paradox concerns the rotation of a "rigid" disc in the theory of relativity.

New!!: General relativity and Ehrenfest paradox · See more »

## Eikonal approximation

In theoretical physics, the eikonal approximation (Greek εἰκών for likeness, icon or image) is an approximative method useful in wave scattering equations which occur in optics, seismology, quantum mechanics, quantum electrodynamics, and partial wave expansion.

New!!: General relativity and Eikonal approximation · See more »

## Einstein field equations

The Einstein field equations (EFE; also known as Einstein's equations) comprise the set of 10 equations in Albert Einstein's general theory of relativity that describe the fundamental interaction of gravitation as a result of spacetime being curved by mass and energy.

New!!: General relativity and Einstein field equations · See more »

## Einstein ring

In observational astronomy an Einstein ring, also known as an Einstein–Chwolson ring or Chwolson ring, is the deformation of the light from a source (such as a galaxy or star) into a ring through gravitational lensing of the source's light by an object with an extremely large mass (such as another galaxy or a black hole).

New!!: General relativity and Einstein ring · See more »

## Einstein tensor

In differential geometry, the Einstein tensor (named after Albert Einstein; also known as the trace-reversed Ricci tensor) is used to express the curvature of a pseudo-Riemannian manifold.

New!!: General relativity and Einstein tensor · See more »

## Einstein's thought experiments

A hallmark of Albert Einstein's career was his use of visualized thought experiments (Gedankenexperiment) as a fundamental tool for understanding physical issues and for elucidating his concepts to others.

New!!: General relativity and Einstein's thought experiments · See more »

## Einstein–Cartan theory

In theoretical physics, the Einstein–Cartan theory, also known as the Einstein–Cartan–Sciama–Kibble theory, is a classical theory of gravitation similar to general relativity.

New!!: General relativity and Einstein–Cartan theory · See more »

## Einstein–Hilbert action

The Einstein–Hilbert action (also referred to as Hilbert action) in general relativity is the action that yields the Einstein field equations through the principle of least action.

New!!: General relativity and Einstein–Hilbert action · See more »

## Electric charge

Electric charge is the physical property of matter that causes it to experience a force when placed in an electromagnetic field.

New!!: General relativity and Electric charge · See more »

## Electric field

An electric field is a vector field surrounding an electric charge that exerts force on other charges, attracting or repelling them.

New!!: General relativity and Electric field · See more »

## Electricity

Electricity is the set of physical phenomena associated with the presence and motion of electric charge.

New!!: General relativity and Electricity · See more »

## Electromagnetic radiation

In physics, electromagnetic radiation (EM radiation or EMR) refers to the waves (or their quanta, photons) of the electromagnetic field, propagating (radiating) through space-time, carrying electromagnetic radiant energy.

New!!: General relativity and Electromagnetic radiation · See more »

## Electromagnetic spectrum

The electromagnetic spectrum is the range of frequencies (the spectrum) of electromagnetic radiation and their respective wavelengths and photon energies.

New!!: General relativity and Electromagnetic spectrum · See more »

## Electromagnetism

Electromagnetism is a branch of physics involving the study of the electromagnetic force, a type of physical interaction that occurs between electrically charged particles.

New!!: General relativity and Electromagnetism · See more »

## Elementary particle

In particle physics, an elementary particle or fundamental particle is a particle with no substructure, thus not composed of other particles.

New!!: General relativity and Elementary particle · See more »

## Ellipse

In mathematics, an ellipse is a curve in a plane surrounding two focal points such that the sum of the distances to the two focal points is constant for every point on the curve.

New!!: General relativity and Ellipse · See more »

## Energy

In physics, energy is the quantitative property that must be transferred to an object in order to perform work on, or to heat, the object.

New!!: General relativity and Energy · See more »

## Energy condition

In relativistic classical field theories of gravitation, particularly general relativity, an energy condition is one of various alternative conditions which can be applied to the matter content of the theory, when it is either not possible or desirable to specify this content explicitly.

New!!: General relativity and Energy condition · See more »

## Energy density

Energy density is the amount of energy stored in a given system or region of space per unit volume.

New!!: General relativity and Energy density · See more »

## Entropy

In statistical mechanics, entropy is an extensive property of a thermodynamic system.

New!!: General relativity and Entropy · See more »

## Equation of state

In physics and thermodynamics, an equation of state is a thermodynamic equation relating state variables which describe the state of matter under a given set of physical conditions, such as pressure, volume, temperature (PVT), or internal energy.

New!!: General relativity and Equation of state · See more »

## Equivalence principle

In the theory of general relativity, the equivalence principle is any of several related concepts dealing with the equivalence of gravitational and inertial mass, and to Albert Einstein's observation that the gravitational "force" as experienced locally while standing on a massive body (such as the Earth) is the same as the pseudo-force experienced by an observer in a non-inertial (accelerated) frame of reference.

New!!: General relativity and Equivalence principle · See more »

## Ergosphere

page.

New!!: General relativity and Ergosphere · See more »

## Euclidean geometry

Euclidean geometry is a mathematical system attributed to Alexandrian Greek mathematician Euclid, which he described in his textbook on geometry: the Elements.

New!!: General relativity and Euclidean geometry · See more »

## Euclidean space

In geometry, Euclidean space encompasses the two-dimensional Euclidean plane, the three-dimensional space of Euclidean geometry, and certain other spaces.

New!!: General relativity and Euclidean space · See more »

## Event (relativity)

In physics, and in particular relativity, an event is the instantaneous physical situation or occurrence associated with a point in spacetime (that is, a specific place and time).

New!!: General relativity and Event (relativity) · See more »

## Event horizon

In general relativity, an event horizon is a region in spacetime beyond which events cannot affect an outside observer.

New!!: General relativity and Event horizon · See more »

## Exact solutions in general relativity

In general relativity, an exact solution is a Lorentzian manifold equipped with tensor fields modeling states of ordinary matter, such as a fluid, or classical nongravitational fields such as the electromagnetic field.

New!!: General relativity and Exact solutions in general relativity · See more »

## Existence theorem

In mathematics, an existence theorem is a theorem with a statement beginning 'there exist(s)..', or more generally 'for all,,...

New!!: General relativity and Existence theorem · See more »

## Expansion of the universe

The expansion of the universe is the increase of the distance between two distant parts of the universe with time.

New!!: General relativity and Expansion of the universe · See more »

## Experimental data

Experimental data in science are data produced by a measurement, test method, experimental design or quasi-experimental design.

New!!: General relativity and Experimental data · See more »

## F(R) gravity

f(R) gravity is a type of modified gravity theory which generalizes Einstein's general relativity.

New!!: General relativity and F(R) gravity · See more »

## Field equation

In theoretical physics and applied mathematics, a field equation is a partial differential equation which determines the dynamics of a physical field, specifically the time evolution and spatial distribution of the field.

New!!: General relativity and Field equation · See more »

## Flatness problem

The flatness problem (also known as the oldness problem) is a cosmological fine-tuning problem within the Big Bang model of the universe.

New!!: General relativity and Flatness problem · See more »

## Force

In physics, a force is any interaction that, when unopposed, will change the motion of an object.

New!!: General relativity and Force · See more »

## Force carrier

In particle physics, force carriers or messenger particles or intermediate particles are particles that give rise to forces between other particles.

New!!: General relativity and Force carrier · See more »

## Four-momentum

In special relativity, four-momentum is the generalization of the classical three-dimensional momentum to four-dimensional spacetime.

New!!: General relativity and Four-momentum · See more »

## Fourier series

In mathematics, a Fourier series is a way to represent a function as the sum of simple sine waves.

New!!: General relativity and Fourier series · See more »

## Frame of reference

In physics, a frame of reference (or reference frame) consists of an abstract coordinate system and the set of physical reference points that uniquely fix (locate and orient) the coordinate system and standardize measurements.

New!!: General relativity and Frame of reference · See more »

## Frame-dragging

Frame-dragging is an effect on spacetime, predicted by Einstein's general theory of relativity, that is due to non-static stationary distributions of mass–energy.

New!!: General relativity and Frame-dragging · See more »

## Francis Bacon

Francis Bacon, 1st Viscount St Alban, (22 January 15619 April 1626) was an English philosopher, statesman, scientist, jurist, orator, and author.

New!!: General relativity and Francis Bacon · See more »

## Free fall

In Newtonian physics, free fall is any motion of a body where gravity is the only force acting upon it.

New!!: General relativity and Free fall · See more »

## Friction

Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.

New!!: General relativity and Friction · See more »

## Friedmann–Lemaître–Robertson–Walker metric

The Friedmann–Lemaître–Robertson–Walker (FLRW) metric is an exact solution of Einstein's field equations of general relativity; it describes a homogeneous, isotropic, expanding or contracting universe that is path connected, but not necessarily simply connected.

New!!: General relativity and Friedmann–Lemaître–Robertson–Walker metric · See more »

## Galaxy

A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter.

New!!: General relativity and Galaxy · See more »

## Galilean invariance

Galilean invariance or Galilean relativity states that the laws of motion are the same in all inertial frames.

New!!: General relativity and Galilean invariance · See more »

## Gauge fixing

In the physics of gauge theories, gauge fixing (also called choosing a gauge) denotes a mathematical procedure for coping with redundant degrees of freedom in field variables.

New!!: General relativity and Gauge fixing · See more »

## Gödel metric

The Gödel metric is an exact solution of the Einstein field equations in which the stress–energy tensor contains two terms, the first representing the matter density of a homogeneous distribution of swirling dust particles (dust solution), and the second associated with a nonzero cosmological constant (see lambdavacuum solution).

New!!: General relativity and Gödel metric · See more »

## General covariance

In theoretical physics, general covariance, also known as diffeomorphism covariance or general invariance, consists of the invariance of the form of physical laws under arbitrary differentiable coordinate transformations.

New!!: General relativity and General covariance · See more »

## General relativity

General relativity (GR, also known as the general theory of relativity or GTR) is the geometric theory of gravitation published by Albert Einstein in 1915 and the current description of gravitation in modern physics.

New!!: General relativity and General relativity · See more »

## General Relativity (book)

General Relativity is a popular textbook on Einstein's theory of general relativity written by Robert Wald.

New!!: General relativity and General Relativity (book) · See more »

## GEO600

GEO600 is a gravitational wave detector located near Sarstedt in the South of Hanover, Germany.

New!!: General relativity and GEO600 · See more »

## Geodesic

In differential geometry, a geodesic is a generalization of the notion of a "straight line" to "curved spaces".

New!!: General relativity and Geodesic · See more »

## Geodesics in general relativity

In general relativity, a geodesic generalizes the notion of a "straight line" to curved spacetime.

New!!: General relativity and Geodesics in general relativity · See more »

## Geodetic effect

The geodetic effect (also known as geodetic precession, de Sitter precession or de Sitter effect) represents the effect of the curvature of spacetime, predicted by general relativity, on a vector carried along with an orbiting body.

New!!: General relativity and Geodetic effect · See more »

## Geometry

Geometry (from the γεωμετρία; geo- "earth", -metron "measurement") is a branch of mathematics concerned with questions of shape, size, relative position of figures, and the properties of space.

New!!: General relativity and Geometry · See more »

## Georges Lemaître

Georges Henri Joseph Édouard Lemaître, RAS Associate (17 July 1894 – 20 June 1966) was a Belgian Catholic Priest, astronomer and professor of physics at the Catholic University of Leuven.

New!!: General relativity and Georges Lemaître · See more »

## Geroch energy

The Geroch energy or Geroch mass is one of the possible definitions of mass in general relativity.

New!!: General relativity and Geroch energy · See more »

## Global Positioning System

The Global Positioning System (GPS), originally Navstar GPS, is a satellite-based radionavigation system owned by the United States government and operated by the United States Air Force.

New!!: General relativity and Global Positioning System · See more »

## Gowdy solution

Gowdy universes or, alternatively, Gowdy solutions of Einstein's equations are simple model spacetimes in general relativity which represent an expanding universe filled with a regular pattern of gravitational waves.

New!!: General relativity and Gowdy solution · See more »

## Gradient

In mathematics, the gradient is a multi-variable generalization of the derivative.

New!!: General relativity and Gradient · See more »

## Gravitation (book)

Gravitation is a physics book on Einstein's theory of gravity, written by Charles W. Misner, Kip S. Thorne, and John Archibald Wheeler and originally published by W. H. Freeman and Company in 1973.

New!!: General relativity and Gravitation (book) · See more »

## Gravitational constant

The gravitational constant (also known as the "universal gravitational constant", the "Newtonian constant of gravitation", or the "Cavendish gravitational constant"), denoted by the letter, is an empirical physical constant involved in the calculation of gravitational effects in Sir Isaac Newton's law of universal gravitation and in Albert Einstein's general theory of relativity.

New!!: General relativity and Gravitational constant · See more »

## Gravitational lens

A gravitational lens is a distribution of matter (such as a cluster of galaxies) between a distant light source and an observer, that is capable of bending the light from the source as the light travels towards the observer.

New!!: General relativity and Gravitational lens · See more »

## Gravitational microlensing

Gravitational microlensing is an astronomical phenomenon due to the gravitational lens effect.

New!!: General relativity and Gravitational microlensing · See more »

## Gravitational potential

In classical mechanics, the gravitational potential at a location is equal to the work (energy transferred) per unit mass that would be needed to move the object from a fixed reference location to the location of the object.

New!!: General relativity and Gravitational potential · See more »

## Gravitational redshift

In astrophysics, gravitational redshift or Einstein shift is the process by which electromagnetic radiation originating from a source that is in a gravitational field is reduced in frequency, or redshifted, when observed in a region at a higher gravitational potential.

New!!: General relativity and Gravitational redshift · See more »

## Gravitational singularity

A gravitational singularity or spacetime singularity is a location in spacetime where the gravitational field of a celestial body becomes infinite in a way that does not depend on the coordinate system.

New!!: General relativity and Gravitational singularity · See more »

## Gravitational time dilation

Gravitational time dilation is a form of time dilation, an actual difference of elapsed time between two events as measured by observers situated at varying distances from a gravitating mass.

New!!: General relativity and Gravitational time dilation · See more »

## Gravitational wave

Gravitational waves are the disturbance in the fabric ("curvature") of spacetime generated by accelerated masses and propagate as waves outward from their source at the speed of light.

New!!: General relativity and Gravitational wave · See more »

## Gravitational-wave astronomy

Gravitational-wave astronomy is an emerging branch of observational astronomy which aims to use gravitational waves (minute distortions of spacetime predicted by Einstein's theory of general relativity) to collect observational data about objects such as neutron stars and black holes, events such as supernovae, and processes including those of the early universe shortly after the Big Bang.

New!!: General relativity and Gravitational-wave astronomy · See more »

## Gravitational-wave observatory

A gravitational-wave observatory (or gravitational-wave detector) is any device designed to measure gravitational waves, tiny distortions of spacetime that were first predicted by Einstein in 1916.

New!!: General relativity and Gravitational-wave observatory · See more »

## Graviton

In theories of quantum gravity, the graviton is the hypothetical elementary particle that mediates the force of gravity.

New!!: General relativity and Graviton · See more »

## Gravity

Gravity, or gravitation, is a natural phenomenon by which all things with mass or energy—including planets, stars, galaxies, and even light—are brought toward (or gravitate toward) one another.

New!!: General relativity and Gravity · See more »

## Gravity Probe A

Gravity Probe A (GP-A) was a space-based experiment to test the equivalence principle, a feature of Einstein's theory of relativity.

New!!: General relativity and Gravity Probe A · See more »

## Gravity Probe B

Gravity Probe B (GP-B) was a satellite-based mission which launched on 20 April 2004 on a Delta II rocket.

New!!: General relativity and Gravity Probe B · See more »

## Gravity well

A gravity well or gravitational well is a conceptual model of the gravitational field surrounding a body in space – the more massive the body, the deeper and more extensive the gravity well associated with it.

New!!: General relativity and Gravity well · See more »

## Gyroscope

A gyroscope (from Ancient Greek γῦρος gûros, "circle" and σκοπέω skopéō, "to look") is a device used for measuring or maintaining orientation and angular velocity.

New!!: General relativity and Gyroscope · See more »

## Hafele–Keating experiment

The Hafele–Keating experiment was a test of the theory of relativity.

New!!: General relativity and Hafele–Keating experiment · See more »

## Hawking energy

The Hawking energy or Hawking mass is one of the possible definitions of mass in general relativity.

New!!: General relativity and Hawking energy · See more »

## Hawking radiation

Hawking radiation is blackbody radiation that is predicted to be released by black holes, due to quantum effects near the event horizon.

New!!: General relativity and Hawking radiation · See more »

## Hertz

The hertz (symbol: Hz) is the derived unit of frequency in the International System of Units (SI) and is defined as one cycle per second.

New!!: General relativity and Hertz · See more »

## History of string theory

The history of string theory spans several decades of intense research including two superstring revolutions.

New!!: General relativity and History of string theory · See more »

## Homogeneity (physics)

In physics, a homogeneous material or system has the same properties at every point; it is uniform without irregularities.

New!!: General relativity and Homogeneity (physics) · See more »

## Hoop Conjecture

The hoop conjecture, proposed by Kip Thorne in 1972, states that an imploding object forms a black hole when, and only when, a circular hoop with a specific critical circumference could be placed around the object and rotated.

New!!: General relativity and Hoop Conjecture · See more »

## Horizon problem

The horizon problem (also known as the homogeneity problem) is a cosmological fine-tuning problem within the Big Bang model of the universe.

New!!: General relativity and Horizon problem · See more »

## Hubble's law

Hubble's law is the name for the observation in physical cosmology that.

New!!: General relativity and Hubble's law · See more »

## Hulse–Taylor binary

PSR B1913+16 (also known as PSR J1915+1606, PSR 1913+16, and the Hulse–Taylor binary after its discoverers) is a pulsar (a radiating neutron star) which together with another neutron star is in orbit around a common center of mass, thus forming a binary star system.

New!!: General relativity and Hulse–Taylor binary · See more »

## Inertia

Inertia is the resistance of any physical object to any change in its position and state of motion.

New!!: General relativity and Inertia · See more »

## Inertial frame of reference

An inertial frame of reference in classical physics and special relativity is a frame of reference in which a body with zero net force acting upon it is not accelerating; that is, such a body is at rest or it is moving at a constant speed in a straight line.

New!!: General relativity and Inertial frame of reference · See more »

## Inflation (cosmology)

In physical cosmology, cosmic inflation, cosmological inflation, or just inflation, is a theory of exponential expansion of space in the early universe.

New!!: General relativity and Inflation (cosmology) · See more »

## Inflaton

The inflaton field is a hypothetical scalar field that is theorized to drive cosmic inflation in the very early universe.

New!!: General relativity and Inflaton · See more »

## Institut Henri Poincaré

The Henri Poincaré Institute (or IHP for Institut Henri Poincaré) is a mathematics research institute part of Sorbonne University, in association with the Centre national de la recherche scientifique (CNRS).

New!!: General relativity and Institut Henri Poincaré · See more »

## Integrable system

In the context of differential equations to integrate an equation means to solve it from initial conditions.

New!!: General relativity and Integrable system · See more »

## Interferometric gravitational wave detector

An interferometric gravitational wave detector is a gravitational wave detector that uses laser interferometry to detect the influence of gravitational waves on light that is moving back and forth between test masses.

New!!: General relativity and Interferometric gravitational wave detector · See more »

## Introduction to the mathematics of general relativity

The mathematics of general relativity is complex.

New!!: General relativity and Introduction to the mathematics of general relativity · See more »

## Invariant (mathematics)

In mathematics, an invariant is a property, held by a class of mathematical objects, which remains unchanged when transformations of a certain type are applied to the objects.

New!!: General relativity and Invariant (mathematics) · See more »

## Isolated system

In physical science, an isolated system is either of the following.

New!!: General relativity and Isolated system · See more »

## Isotropy

Isotropy is uniformity in all orientations; it is derived from the Greek isos (ἴσος, "equal") and tropos (τρόπος, "way").

New!!: General relativity and Isotropy · See more »

## John Archibald Wheeler

John Archibald Wheeler (July 9, 1911 – April 13, 2008) was an American theoretical physicist.

New!!: General relativity and John Archibald Wheeler · See more »

## John C. Baez

John Carlos Baez (born June 12, 1961) is an American mathematical physicist and a professor of mathematics at the University of California, Riverside (UCR) in Riverside, California.

New!!: General relativity and John C. Baez · See more »

## Joseph Hooton Taylor Jr.

Joseph Hooton Taylor Jr. (born March 29, 1941) is an American astrophysicist and Nobel Prize in Physics laureate for his discovery with Russell Alan Hulse of a "new type of pulsar, a discovery that has opened up new possibilities for the study of gravitation.".

New!!: General relativity and Joseph Hooton Taylor Jr. · See more »

## Karl Schwarzschild

Karl Schwarzschild (October 9, 1873 – May 11, 1916) was a German physicist and astronomer.

New!!: General relativity and Karl Schwarzschild · See more »

## Kerr metric

The Kerr metric or Kerr geometry describes the geometry of empty spacetime around a rotating uncharged axially-symmetric black hole with a spherical event horizon.

New!!: General relativity and Kerr metric · See more »

## Komar mass

The Komar mass (named after Arthur Komar) of a system is one of several formal concepts of mass that are used in general relativity.

New!!: General relativity and Komar mass · See more »

## Kurt Gödel

Kurt Friedrich Gödel (April 28, 1906 – January 14, 1978) was an Austrian, and later American, logician, mathematician, and philosopher.

New!!: General relativity and Kurt Gödel · See more »

## LAGEOS

LAGEOS, Laser Geodynamics Satellite or Laser Geometric Environmental Observation Survey, are a series of two scientific research satellites designed to provide an orbiting laser ranging benchmark for geodynamical studies of the Earth.

New!!: General relativity and LAGEOS · See more »

## Lagrangian (field theory)

Lagrangian field theory is a formalism in classical field theory.

New!!: General relativity and Lagrangian (field theory) · See more »

## Lane P. Hughston

Lane P. Hughston (born 24 December 1951) is an American mathematician.

New!!: General relativity and Lane P. Hughston · See more »

## Laser Interferometer Space Antenna

The Laser Interferometer Space Antenna (LISA) is a European Space Agency mission designed to detect and accurately measure gravitational waves—tiny ripples in the fabric of space-time—from astronomical sources.

New!!: General relativity and Laser Interferometer Space Antenna · See more »

## Laws of thermodynamics

The four laws of thermodynamics define fundamental physical quantities (temperature, energy, and entropy) that characterize thermodynamic systems at thermal equilibrium.

New!!: General relativity and Laws of thermodynamics · See more »

## Leonard Susskind

Leonard Susskind (born 1940)his 60th birthday was celebrated with a special symposium at Stanford University.

New!!: General relativity and Leonard Susskind · See more »

## Levi-Civita connection

In Riemannian geometry, the Levi-Civita connection is a specific connection on the tangent bundle of a manifold.

New!!: General relativity and Levi-Civita connection · See more »

## Light-year

The light-year is a unit of length used to express astronomical distances and measures about 9.5 trillion kilometres or 5.9 trillion miles.

New!!: General relativity and Light-year · See more »

## LIGO

The Laser Interferometer Gravitational-Wave Observatory (LIGO) is a large-scale physics experiment and observatory to detect cosmic gravitational waves and to develop gravitational-wave observations as an astronomical tool.

New!!: General relativity and LIGO · See more »

## Limiting case (philosophy of science)

In the philosophy of science, under the correspondence principle, a limiting case theory is an earlier theory which becomes incorporated into a later, usually broader theory; that is to say, the earlier (limiting case) theory proves to be a special or limited case of the later theory.

New!!: General relativity and Limiting case (philosophy of science) · See more »

## Linearized gravity

Linearized gravity is an approximation scheme in general relativity in which the nonlinear contributions from the spacetime metric are ignored, simplifying the study of many problems while still producing useful approximate results.

New!!: General relativity and Linearized gravity · See more »

## LISA Pathfinder

LISA Pathfinder, formerly Small Missions for Advanced Research in Technology-2 (SMART-2), was an ESA spacecraft that was launched on 3 December 2015.

New!!: General relativity and LISA Pathfinder · See more »

## List of contributors to general relativity

This is a partial list of persons who have made major contributions to the development of standard mainstream general relativity.

New!!: General relativity and List of contributors to general relativity · See more »

## List of gravitational wave observations

This is a list of observed gravitational wave events.

New!!: General relativity and List of gravitational wave observations · See more »

## Living Reviews in Relativity

Living Reviews in Relativity is a peer-reviewed open-access scientific journal publishing reviews on relativity in the areas of physics and astrophysics.

New!!: General relativity and Living Reviews in Relativity · See more »

## Local reference frame

In theoretical physics, a local reference frame (local frame) refers to a coordinate system or frame of reference that is only expected to function over a small region or a restricted region of space or spacetime.

New!!: General relativity and Local reference frame · See more »

## Local spacetime structure

Local spacetime structure refers to the structure of spacetime on a local level, i.e. only considering those points in an open region of a point.

New!!: General relativity and Local spacetime structure · See more »

## Loop quantum gravity

Loop quantum gravity (LQG) is a theory of quantum gravity, merging quantum mechanics and general relativity.

New!!: General relativity and Loop quantum gravity · See more »

## Loránd Eötvös

Baron Loránd Eötvös de Vásárosnamény (vásárosnaményi báró Eötvös Loránd Ágoston or Loránd Eötvös,; 27 July 1848 – 8 April 1919), more commonly called Baron Roland von Eötvös in English literature, was an Austro-Hungarian physicist of ethnic Hungarian origin.

New!!: General relativity and Loránd Eötvös · See more »

## Lorentz covariance

In relativistic physics, Lorentz symmetry, named for Hendrik Lorentz, is an equivalence of observation or observational symmetry due to special relativity implying that the laws of physics stay the same for all observers that are moving with respect to one another within an inertial frame.

New!!: General relativity and Lorentz covariance · See more »

## Lunar Laser Ranging experiment

The ongoing Lunar Laser Ranging experiment measures the distance between Earth and the Moon using laser ranging.

New!!: General relativity and Lunar Laser Ranging experiment · See more »

## M-theory

M-theory is a theory in physics that unifies all consistent versions of superstring theory.

New!!: General relativity and M-theory · See more »

## Magnetic field

A magnetic field is a vector field that describes the magnetic influence of electrical currents and magnetized materials.

New!!: General relativity and Magnetic field · See more »

## Manifold

In mathematics, a manifold is a topological space that locally resembles Euclidean space near each point.

New!!: General relativity and Manifold · See more »

## Mars Global Surveyor

Mars Global Surveyor (MGS) was an American robotic spacecraft developed by NASA's Jet Propulsion Laboratory and launched November 1996.

New!!: General relativity and Mars Global Surveyor · See more »

## Mass

Mass is both a property of a physical body and a measure of its resistance to acceleration (a change in its state of motion) when a net force is applied.

New!!: General relativity and Mass · See more »

## Matter

In the classical physics observed in everyday life, matter is any substance that has mass and takes up space by having volume.

New!!: General relativity and Matter · See more »

## Max Planck Institute for Gravitational Physics

The Max Planck Institute for Gravitational Physics (Albert Einstein Institute) is a Max Planck Institute whose research is aimed at investigating Einstein’s theory of relativity and beyond: Mathematics, quantum gravity, astrophysical relativity, and gravitational wave astronomy.

New!!: General relativity and Max Planck Institute for Gravitational Physics · See more »

## Mercury (planet)

Mercury is the smallest and innermost planet in the Solar System.

New!!: General relativity and Mercury (planet) · See more »

## Metric tensor (general relativity)

In general relativity, the metric tensor (in this context often abbreviated to simply the metric) is the fundamental object of study.

New!!: General relativity and Metric tensor (general relativity) · See more »

## Microquasar

A microquasar, the smaller version of a quasar, is a compact region surrounding a black hole with a mass several times that of our sun, and its companion star.

New!!: General relativity and Microquasar · See more »

## Milky Way

The Milky Way is the galaxy that contains our Solar System.

New!!: General relativity and Milky Way · See more »

## Millisecond pulsar

A millisecond pulsar (MSP) is a pulsar with a rotational period in the range of about 1–10 milliseconds.

New!!: General relativity and Millisecond pulsar · See more »

## Minkowski diagram

The Minkowski diagram, also known as a spacetime diagram, was developed in 1908 by Hermann Minkowski and provides an illustration of the properties of space and time in the special theory of relativity.

New!!: General relativity and Minkowski diagram · See more »

## Minkowski space

In mathematical physics, Minkowski space (or Minkowski spacetime) is a combining of three-dimensional Euclidean space and time into a four-dimensional manifold where the spacetime interval between any two events is independent of the inertial frame of reference in which they are recorded.

New!!: General relativity and Minkowski space · See more »

## Modern physics

Modern physics is the post-Newtonian conception of physics.

New!!: General relativity and Modern physics · See more »

## Momentum

In Newtonian mechanics, linear momentum, translational momentum, or simply momentum (pl. momenta) is the product of the mass and velocity of an object.

New!!: General relativity and Momentum · See more »

## Naked singularity

In general relativity, a naked singularity is a gravitational singularity without an event horizon.

New!!: General relativity and Naked singularity · See more »

## National Center for Supercomputing Applications

The National Center for Supercomputing Applications (NCSA) is a state-federal partnership to develop and deploy national-scale cyberinfrastructure that advances research, science and engineering based in the United States of America.

New!!: General relativity and National Center for Supercomputing Applications · See more »

## Negative mass

In theoretical physics, negative mass is matter whose mass is of opposite sign to the mass of normal matter, e.g. −1 kg.

New!!: General relativity and Negative mass · See more »

## Neutron star

A neutron star is the collapsed core of a large star which before collapse had a total of between 10 and 29 solar masses.

New!!: General relativity and Neutron star · See more »

## Newton's law of universal gravitation

Newton's law of universal gravitation states that a particle attracts every other particle in the universe with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.

New!!: General relativity and Newton's law of universal gravitation · See more »

## Newton's laws of motion

Newton's laws of motion are three physical laws that, together, laid the foundation for classical mechanics.

New!!: General relativity and Newton's laws of motion · See more »

## Newton–Cartan theory

Newton–Cartan theory (or geometrized Newtonian gravitation) is a geometrical re-formulation, as well as a generalization, of Newtonian gravity first introduced by Élie Cartan and Kurt Friedrichs and later developed by Dautcourt, Dixon, Dombrowski and Horneffer, Ehlers, Havas, Künzle, Lottermoser, Trautman, and others.

New!!: General relativity and Newton–Cartan theory · See more »

## No-hair theorem

The no-hair theorem postulates that all black hole solutions of the Einstein-Maxwell equations of gravitation and electromagnetism in general relativity can be completely characterized by only three externally observable classical parameters: mass, electric charge, and angular momentum.

New!!: General relativity and No-hair theorem · See more »

## Nobel Prize

The Nobel Prize (Swedish definite form, singular: Nobelpriset; Nobelprisen) is a set of six annual international awards bestowed in several categories by Swedish and Norwegian institutions in recognition of academic, cultural, or scientific advances.

New!!: General relativity and Nobel Prize · See more »

## Nonlinear system

In mathematics and science, a nonlinear system is a system in which the change of the output is not proportional to the change of the input.

New!!: General relativity and Nonlinear system · See more »

## Normal mode

A normal mode of an oscillating system is a pattern of motion in which all parts of the system move sinusoidally with the same frequency and with a fixed phase relation.

New!!: General relativity and Normal mode · See more »

## Numerical integration

In numerical analysis, numerical integration constitutes a broad family of algorithms for calculating the numerical value of a definite integral, and by extension, the term is also sometimes used to describe the numerical solution of differential equations.

New!!: General relativity and Numerical integration · See more »

## Numerical relativity

Numerical relativity is one of the branches of general relativity that uses numerical methods and algorithms to solve and analyze problems.

New!!: General relativity and Numerical relativity · See more »

## Observational astronomy

Observational astronomy is a division of astronomy that is concerned with recording data about the observable universe, in contrast with theoretical astronomy, which is mainly concerned with calculating the measurable implications of physical models.

New!!: General relativity and Observational astronomy · See more »

## Occam's razor

Occam's razor (also Ockham's razor or Ocham's razor; Latin: lex parsimoniae "law of parsimony") is the problem-solving principle that, the simplest explanation tends to be the right one.

New!!: General relativity and Occam's razor · See more »

## Orbit

In physics, an orbit is the gravitationally curved trajectory of an object, such as the trajectory of a planet around a star or a natural satellite around a planet.

New!!: General relativity and Orbit · See more »

## Orbital eccentricity

The orbital eccentricity of an astronomical object is a parameter that determines the amount by which its orbit around another body deviates from a perfect circle.

New!!: General relativity and Orbital eccentricity · See more »

## Orbital period

The orbital period is the time a given astronomical object takes to complete one orbit around another object, and applies in astronomy usually to planets or asteroids orbiting the Sun, moons orbiting planets, exoplanets orbiting other stars, or binary stars.

New!!: General relativity and Orbital period · See more »

## Order of magnitude

An order of magnitude is an approximate measure of the number of digits that a number has in the commonly-used base-ten number system.

New!!: General relativity and Order of magnitude · See more »

## Parallel transport

In geometry, parallel transport is a way of transporting geometrical data along smooth curves in a manifold.

New!!: General relativity and Parallel transport · See more »

## Parameterized post-Newtonian formalism

Post-Newtonian formalism is a calculational tool that expresses Einstein's (nonlinear) equations of gravity in terms of the lowest-order deviations from Newton's law of universal gravitation.

New!!: General relativity and Parameterized post-Newtonian formalism · See more »

## Partial differential equation

In mathematics, a partial differential equation (PDE) is a differential equation that contains unknown multivariable functions and their partial derivatives.

New!!: General relativity and Partial differential equation · See more »

## Particle horizon

The particle horizon (also called the cosmological horizon, the comoving horizon (in Dodelson's text), or the cosmic light horizon) is the maximum distance from which particles could have traveled to the observer in the age of the universe.

New!!: General relativity and Particle horizon · See more »

## Particle physics

Particle physics (also high energy physics) is the branch of physics that studies the nature of the particles that constitute matter and radiation.

New!!: General relativity and Particle physics · See more »

## Path integral formulation

The path integral formulation of quantum mechanics is a description of quantum theory that generalizes the action principle of classical mechanics.

New!!: General relativity and Path integral formulation · See more »

## Penrose diagram

In theoretical physics, a Penrose diagram (named after mathematical physicist Roger Penrose) is a two-dimensional diagram capturing the causal relations between different points in spacetime.

New!!: General relativity and Penrose diagram · See more »

## Penrose process

The Penrose process (also called Penrose mechanism) is a process theorised by Roger Penrose wherein energy can be extracted from a rotating black hole.

New!!: General relativity and Penrose process · See more »

## Penrose–Hawking singularity theorems

The Penrose–Hawking singularity theorems are a set of results in general relativity that attempt to answer the question of when gravitation produces singularities.

New!!: General relativity and Penrose–Hawking singularity theorems · See more »

## Perturbation theory

Perturbation theory comprises mathematical methods for finding an approximate solution to a problem, by starting from the exact solution of a related, simpler problem.

New!!: General relativity and Perturbation theory · See more »

## Physical body

In physics, a physical body or physical object (or simply a body or object) is an identifiable collection of matter, which may be constrained by an identifiable boundary, and may move as a unit by translation or rotation, in 3-dimensional space.

New!!: General relativity and Physical body · See more »

## Physical cosmology

Physical cosmology is the study of the largest-scale structures and dynamics of the Universe and is concerned with fundamental questions about its origin, structure, evolution, and ultimate fate.

New!!: General relativity and Physical cosmology · See more »

## Physical law

A physical law or scientific law is a theoretical statement "inferred from particular facts, applicable to a defined group or class of phenomena, and expressible by the statement that a particular phenomenon always occurs if certain conditions be present." Physical laws are typically conclusions based on repeated scientific experiments and observations over many years and which have become accepted universally within the scientific community.

New!!: General relativity and Physical law · See more »

## Planck's law

Planck's law describes the spectral density of electromagnetic radiation emitted by a black body in thermal equilibrium at a given temperature T. The law is named after Max Planck, who proposed it in 1900.

New!!: General relativity and Planck's law · See more »

## Planet

A planet is an astronomical body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of planetesimals.

New!!: General relativity and Planet · See more »

## Poincaré group

The Poincaré group, named after Henri Poincaré (1906), was first defined by Minkowski (1908) as the group of Minkowski spacetime isometries.

New!!: General relativity and Poincaré group · See more »

## Point particle

A point particle (ideal particle or point-like particle, often spelled pointlike particle) is an idealization of particles heavily used in physics.

New!!: General relativity and Point particle · See more »

## Polarization (waves)

Polarization (also polarisation) is a property applying to transverse waves that specifies the geometrical orientation of the oscillations.

New!!: General relativity and Polarization (waves) · See more »

## Post-Newtonian expansion

Post-Newtonian expansions in general relativity are used for finding an approximate solution of the Einstein field equations for the metric tensor.

New!!: General relativity and Post-Newtonian expansion · See more »

## Potential

Potential generally refers to a currently unrealized ability.

New!!: General relativity and Potential · See more »

## Pound–Rebka experiment

The Pound–Rebka experiment is a well known experiment to test Albert Einstein's theory of general relativity.

New!!: General relativity and Pound–Rebka experiment · See more »

## Precession

Precession is a change in the orientation of the rotational axis of a rotating body.

New!!: General relativity and Precession · See more »

## Pressure

Pressure (symbol: p or P) is the force applied perpendicular to the surface of an object per unit area over which that force is distributed.

New!!: General relativity and Pressure · See more »

## Principle of relativity

In physics, the principle of relativity is the requirement that the equations describing the laws of physics have the same form in all admissible frames of reference.

New!!: General relativity and Principle of relativity · See more »

## Proper time

In relativity, proper time along a timelike world line is defined as the time as measured by a clock following that line.

New!!: General relativity and Proper time · See more »

## Prussian Academy of Sciences

The Royal Prussian Academy of Sciences (Königlich-Preußische Akademie der Wissenschaften) was an academy established in Berlin, Germany on 11 July 1700, four years after the Akademie der Künste, or "Arts Academy," to which "Berlin Academy" may also refer.

New!!: General relativity and Prussian Academy of Sciences · See more »

## Pseudo-Riemannian manifold

In differential geometry, a pseudo-Riemannian manifold (also called a semi-Riemannian manifold) is a generalization of a Riemannian manifold in which the metric tensor need not be positive-definite, but need only be a non-degenerate bilinear form, which is a weaker condition.

New!!: General relativity and Pseudo-Riemannian manifold · See more »

## PSR J0737-3039

PSR J0737−3039 is the only known double pulsar.

New!!: General relativity and PSR J0737-3039 · See more »

## Pulsar

A pulsar (from pulse and -ar as in quasar) is a highly magnetized rotating neutron star or white dwarf that emits a beam of electromagnetic radiation.

New!!: General relativity and Pulsar · See more »

## Pulsar timing array

A pulsar timing array (PTA) is a set of pulsars which is analyzed to search for correlated signatures in the pulse arrival times.

New!!: General relativity and Pulsar timing array · See more »

## Quantum cosmology

Quantum cosmology is the attempt in theoretical physics to develop a quantum theory of the Universe.

New!!: General relativity and Quantum cosmology · See more »

## Quantum field theory

In theoretical physics, quantum field theory (QFT) is the theoretical framework for constructing quantum mechanical models of subatomic particles in particle physics and quasiparticles in condensed matter physics.

New!!: General relativity and Quantum field theory · See more »

## Quantum gravity

Quantum gravity (QG) is a field of theoretical physics that seeks to describe gravity according to the principles of quantum mechanics, and where quantum effects cannot be ignored, such as near compact astrophysical objects where the effects of gravity are strong.

New!!: General relativity and Quantum gravity · See more »

## Quantum mechanics

Quantum mechanics (QM; also known as quantum physics, quantum theory, the wave mechanical model, or matrix mechanics), including quantum field theory, is a fundamental theory in physics which describes nature at the smallest scales of energy levels of atoms and subatomic particles.

New!!: General relativity and Quantum mechanics · See more »

## Quasar

A quasar (also known as a QSO or quasi-stellar object) is an extremely luminous active galactic nucleus (AGN).

New!!: General relativity and Quasar · See more »

## Radiation

In physics, radiation is the emission or transmission of energy in the form of waves or particles through space or through a material medium.

New!!: General relativity and Radiation · See more »

## Raychaudhuri equation

In general relativity, the Raychaudhuri equation, or Landau–Raychaudhuri equation, is a fundamental result describing the motion of nearby bits of matter.

New!!: General relativity and Raychaudhuri equation · See more »

## Redshift

In physics, redshift happens when light or other electromagnetic radiation from an object is increased in wavelength, or shifted to the red end of the spectrum.

New!!: General relativity and Redshift · See more »

## Regge calculus

In general relativity, Regge calculus is a formalism for producing simplicial approximations of spacetimes that are solutions to the Einstein field equation.

New!!: General relativity and Regge calculus · See more »

## Reissner–Nordström metric

In physics and astronomy, the Reissner–Nordström metric is a static solution to the Einstein-Maxwell field equations, which corresponds to the gravitational field of a charged, non-rotating, spherically symmetric body of mass M. The metric was discovered by Hans Reissner, Hermann Weyl, Gunnar Nordström and G. B. Jeffery.

New!!: General relativity and Reissner–Nordström metric · See more »

## Relativity priority dispute

Albert Einstein presented the theories of special relativity and general relativity in publications that either contained no formal references to previous literature, or referred only to a small number of his predecessors for fundamental results on which he based his theories, most notably to the work of Hendrik Lorentz for special relativity, and to the work of Carl F. Gauss, Bernhard Riemann, and Ernst Mach for general relativity.

New!!: General relativity and Relativity priority dispute · See more »

## Renormalization

Renormalization is a collection of techniques in quantum field theory, the statistical mechanics of fields, and the theory of self-similar geometric structures, that are used to treat infinities arising in calculated quantities by altering values of quantities to compensate for effects of their self-interactions.

New!!: General relativity and Renormalization · See more »

## Ricci calculus

In mathematics, Ricci calculus constitutes the rules of index notation and manipulation for tensors and tensor fields.

New!!: General relativity and Ricci calculus · See more »

## Ricci curvature

In differential geometry, the Ricci curvature tensor, named after Gregorio Ricci-Curbastro, represents the amount by which the volume of a small wedge of a geodesic ball in a curved Riemannian manifold deviates from that of the standard ball in Euclidean space.

New!!: General relativity and Ricci curvature · See more »

## Riemann curvature tensor

In the mathematical field of differential geometry, the Riemann curvature tensor or Riemann–Christoffel tensor (after Bernhard Riemann and Elwin Bruno Christoffel) is the most common method used to express the curvature of Riemannian manifolds.

New!!: General relativity and Riemann curvature tensor · See more »

## Rindler coordinates

In relativistic physics, the coordinates of a hyperbolically accelerated reference frame constitute an important and useful coordinate chart representing part of flat Minkowski spacetime.

New!!: General relativity and Rindler coordinates · See more »

## Roger Penrose

Sir Roger Penrose (born 8 August 1931) is an English mathematical physicist, mathematician and philosopher of science.

New!!: General relativity and Roger Penrose · See more »

## Rose (mathematics)

In mathematics, a rose or rhodonea curve is a sinusoid plotted in polar coordinates.

New!!: General relativity and Rose (mathematics) · See more »

## Russell Alan Hulse

Russell Alan Hulse (born November 28, 1950) is an American physicist and winner of the Nobel Prize in Physics, shared with his thesis advisor Joseph Hooton Taylor Jr., "for the discovery of a new type of pulsar, a discovery that has opened up new possibilities for the study of gravitation".

New!!: General relativity and Russell Alan Hulse · See more »

## Scalar curvature

In Riemannian geometry, the scalar curvature (or the Ricci scalar) is the simplest curvature invariant of a Riemannian manifold.

New!!: General relativity and Scalar curvature · See more »

## Scalar field

In mathematics and physics, a scalar field associates a scalar value to every point in a space – possibly physical space.

New!!: General relativity and Scalar field · See more »

## Schrödinger equation

In quantum mechanics, the Schrödinger equation is a mathematical equation that describes the changes over time of a physical system in which quantum effects, such as wave–particle duality, are significant.

New!!: General relativity and Schrödinger equation · See more »

## Schwarzschild metric

In Einstein's theory of general relativity, the Schwarzschild metric (also known as the Schwarzschild vacuum or Schwarzschild solution) is the solution to the Einstein field equations that describes the gravitational field outside a spherical mass, on the assumption that the electric charge of the mass, angular momentum of the mass, and universal cosmological constant are all zero.

New!!: General relativity and Schwarzschild metric · See more »

## Schwarzschild radius

The Schwarzschild radius (sometimes historically referred to as the gravitational radius) is a physical parameter that shows up in the Schwarzschild solution to Einstein's field equations, corresponding to the radius defining the event horizon of a Schwarzschild black hole.

New!!: General relativity and Schwarzschild radius · See more »

## Science (journal)

Science, also widely referred to as Science Magazine, is the peer-reviewed academic journal of the American Association for the Advancement of Science (AAAS) and one of the world's top academic journals.

New!!: General relativity and Science (journal) · See more »

## Scientific theory

A scientific theory is an explanation of an aspect of the natural world that can be repeatedly tested, in accordance with the scientific method, using a predefined protocol of observation and experiment.

New!!: General relativity and Scientific theory · See more »

## Self-energy

In most theoretical physics such as quantum field theory, the energy that a particle has as a result of changes that it itself causes in its environment defines self-energy \Sigma, and represents the contribution to the particle's energy, or effective mass, due to interactions between the particle and its system.

New!!: General relativity and Self-energy · See more »

## Semi-major and semi-minor axes

In geometry, the major axis of an ellipse is its longest diameter: a line segment that runs through the center and both foci, with ends at the widest points of the perimeter.

New!!: General relativity and Semi-major and semi-minor axes · See more »

## Shapiro time delay

The Shapiro time delay effect, or gravitational time delay effect, is one of the four classic solar-system tests of general relativity.

New!!: General relativity and Shapiro time delay · See more »

## Solar eclipse of May 29, 1919

A total solar eclipse occurred on May 29, 1919.

New!!: General relativity and Solar eclipse of May 29, 1919 · See more »

## Solar mass

The solar mass is a standard unit of mass in astronomy, equal to approximately.

New!!: General relativity and Solar mass · See more »

## Solar System

The Solar SystemCapitalization of the name varies.

New!!: General relativity and Solar System · See more »

## Solid-state physics

Solid-state physics is the study of rigid matter, or solids, through methods such as quantum mechanics, crystallography, electromagnetism, and metallurgy.

New!!: General relativity and Solid-state physics · See more »

## Solutions of the Einstein field equations

Solutions of the Einstein field equations are spacetimes that result from solving the Einstein field equations (EFE) of general relativity.

New!!: General relativity and Solutions of the Einstein field equations · See more »

## Space

Space is the boundless three-dimensional extent in which objects and events have relative position and direction.

New!!: General relativity and Space · See more »

## Spacecraft

A spacecraft is a vehicle or machine designed to fly in outer space.

New!!: General relativity and Spacecraft · See more »

## Spacetime

In physics, spacetime is any mathematical model that fuses the three dimensions of space and the one dimension of time into a single four-dimensional continuum.

New!!: General relativity and Spacetime · See more »

## Spacetime topology

Spacetime topology is the topological structure of spacetime, a topic studied primarily in general relativity.

New!!: General relativity and Spacetime topology · See more »

## Special relativity

In physics, special relativity (SR, also known as the special theory of relativity or STR) is the generally accepted and experimentally well-confirmed physical theory regarding the relationship between space and time.

New!!: General relativity and Special relativity · See more »

## Speed of light

The speed of light in vacuum, commonly denoted, is a universal physical constant important in many areas of physics.

New!!: General relativity and Speed of light · See more »

## Spin network

In physics, a spin network is a type of diagram which can be used to represent states and interactions between particles and fields in quantum mechanics.

New!!: General relativity and Spin network · See more »

## Stanford University

Stanford University (officially Leland Stanford Junior University, colloquially the Farm) is a private research university in Stanford, California.

New!!: General relativity and Stanford University · See more »

## Star

A star is type of astronomical object consisting of a luminous spheroid of plasma held together by its own gravity.

New!!: General relativity and Star · See more »

## Static spacetime

In general relativity, a spacetime is said to be static if it does not change over time and is also irrotational.

New!!: General relativity and Static spacetime · See more »

## Stationary spacetime

In general relativity, specifically in the Einstein field equations, a spacetime is said to be stationary if it admits a Killing vector that is asymptotically timelike.

New!!: General relativity and Stationary spacetime · See more »

## Stellar black hole

A stellar black hole (or stellar-mass black hole) is a black hole formed by the gravitational collapse of a massive star.

New!!: General relativity and Stellar black hole · See more »

## Stellar collision

A stellar collision is the coming together of two stars caused by gravity, gravitational radiation, or other mechanisms not well understood.

New!!: General relativity and Stellar collision · See more »

## Stellar evolution

Stellar evolution is the process by which a star changes over the course of time.

New!!: General relativity and Stellar evolution · See more »

## Stress (mechanics)

In continuum mechanics, stress is a physical quantity that expresses the internal forces that neighboring particles of a continuous material exert on each other, while strain is the measure of the deformation of the material.

New!!: General relativity and Stress (mechanics) · See more »

## Stress–energy tensor

The stress–energy tensor (sometimes stress–energy–momentum tensor or energy–momentum tensor) is a tensor quantity in physics that describes the density and flux of energy and momentum in spacetime, generalizing the stress tensor of Newtonian physics.

New!!: General relativity and Stress–energy tensor · See more »

## String theory

In physics, string theory is a theoretical framework in which the point-like particles of particle physics are replaced by one-dimensional objects called strings.

New!!: General relativity and String theory · See more »

## Subrahmanyan Chandrasekhar

Subrahmanyan Chandrasekhar FRS (19 October 1910 – 21 August 1995) was an Indian American astrophysicist who spent his professional life in the United States.

New!!: General relativity and Subrahmanyan Chandrasekhar · See more »

## Sun

The Sun is the star at the center of the Solar System.

New!!: General relativity and Sun · See more »

## Supergravity

In theoretical physics, supergravity (supergravity theory; SUGRA for short) is a modern field theory that combines the principles of supersymmetry and general relativity where supersymmetry obeys locality; in contrast to non-gravitational supersymmetric theories such as the Minimal Supersymmetric Standard Model.

New!!: General relativity and Supergravity · See more »

## Superluminal motion

In astronomy, superluminal motion is the apparently faster-than-light motion seen in some radio galaxies, BL Lac objects, quasars and recently also in some galactic sources called microquasars.

New!!: General relativity and Superluminal motion · See more »

## Supermassive black hole

A supermassive black hole (SMBH or SBH) is the largest type of black hole, on the order of hundreds of thousands to billions of solar masses, and is found in the centre of almost all currently known massive galaxies.

New!!: General relativity and Supermassive black hole · See more »

## Supernova

A supernova (plural: supernovae or supernovas, abbreviations: SN and SNe) is a transient astronomical event that occurs during the last stellar evolutionary stages of a star's life, either a massive star or a white dwarf, whose destruction is marked by one final, titanic explosion.

New!!: General relativity and Supernova · See more »

## Superposition principle

In physics and systems theory, the superposition principle, also known as superposition property, states that, for all linear systems, the net response caused by two or more stimuli is the sum of the responses that would have been caused by each stimulus individually.

New!!: General relativity and Superposition principle · See more »

## Supersymmetry

In particle physics, supersymmetry (SUSY) is a theory that proposes a relationship between two basic classes of elementary particles: bosons, which have an integer-valued spin, and fermions, which have a half-integer spin.

New!!: General relativity and Supersymmetry · See more »

## Symmetry

Symmetry (from Greek συμμετρία symmetria "agreement in dimensions, due proportion, arrangement") in everyday language refers to a sense of harmonious and beautiful proportion and balance.

New!!: General relativity and Symmetry · See more »

## TAMA 300

TAMA 300 was a gravitational wave detector located at the Mitaka campus of the National Astronomical Observatory of Japan.

New!!: General relativity and TAMA 300 · See more »

## Taub–NUT space

The Taub–NUT metric is an exact solution to Einstein's equations.

New!!: General relativity and Taub–NUT space · See more »

## Teleparallelism

Teleparallelism (also called teleparallel gravity), was an attempt by Albert Einstein to base a unified theory of electromagnetism and gravity on the mathematical structure of distant parallelism, also referred to as absolute or teleparallelism.

New!!: General relativity and Teleparallelism · See more »

## Tensor

In mathematics, tensors are geometric objects that describe linear relations between geometric vectors, scalars, and other tensors.

New!!: General relativity and Tensor · See more »

## Test particle

In physical theories, a test particle is an idealized model of an object whose physical properties (usually mass, charge, or size) are assumed to be negligible except for the property being studied, which is considered to be insufficient to alter the behavior of the rest of the system.

New!!: General relativity and Test particle · See more »

## Tests of general relativity

Tests of general relativity serve to establish observational evidence for the theory of general relativity.

New!!: General relativity and Tests of general relativity · See more »

## The Large Scale Structure of Space-Time

The Large Scale Structure of Space-Time is 1973 book by Stephen Hawking and George Ellis on the theoretical physics of spacetime.

New!!: General relativity and The Large Scale Structure of Space-Time · See more »

## Theoretical physics

Theoretical physics is a branch of physics that employs mathematical models and abstractions of physical objects and systems to rationalize, explain and predict natural phenomena.

New!!: General relativity and Theoretical physics · See more »

## Theory of everything

A theory of everything (ToE), final theory, ultimate theory, or master theory is a hypothetical single, all-encompassing, coherent theoretical framework of physics that fully explains and links together all physical aspects of the universe.

New!!: General relativity and Theory of everything · See more »

## Theory of relativity

The theory of relativity usually encompasses two interrelated theories by Albert Einstein: special relativity and general relativity.

New!!: General relativity and Theory of relativity · See more »

## Thermal radiation

Thermal radiation is electromagnetic radiation generated by the thermal motion of charged particles in matter.

New!!: General relativity and Thermal radiation · See more »

## Thought experiment

A thought experiment (Gedankenexperiment, Gedanken-Experiment or Gedankenerfahrung) considers some hypothesis, theory, or principle for the purpose of thinking through its consequences.

New!!: General relativity and Thought experiment · See more »

## Tidal force

The tidal force is an apparent force that stretches a body towards the center of mass of another body due to a gradient (difference in strength) in gravitational field from the other body; it is responsible for the diverse phenomena, including tides, tidal locking, breaking apart of celestial bodies and formation of ring systems within Roche limit, and in extreme cases, spaghettification of objects.

New!!: General relativity and Tidal force · See more »

## Time evolution

Time evolution is the change of state brought about by the passage of time, applicable to systems with internal state (also called stateful systems).

New!!: General relativity and Time evolution · See more »

## Time in physics

Time in physics is defined by its measurement: time is what a clock reads.

New!!: General relativity and Time in physics · See more »

## Time travel

Time travel is the concept of movement between certain points in time, analogous to movement between different points in space by an object or a person, typically using a hypothetical device known as a time machine.

New!!: General relativity and Time travel · See more »

## Timeline of gravitational physics and relativity

Timeline of gravitational physics and general relativity.

New!!: General relativity and Timeline of gravitational physics and relativity · See more »

## Tipler cylinder

A Tipler cylinder, also called a Tipler time machine, is a hypothetical object theorized to be a potential mode of time travel—although results have shown that a Tipler cylinder could only allow time travel if its length were infinite or with the existence of negative energy.

New!!: General relativity and Tipler cylinder · See more »

## Torsion tensor

In differential geometry, the notion of torsion is a manner of characterizing a twist or screw of a moving frame around a curve.

New!!: General relativity and Torsion tensor · See more »

## Trajectory

A trajectory or flight path is the path that a massive object in motion follows through space as a function of time.

New!!: General relativity and Trajectory · See more »

## Transponder

In telecommunication, a transponder can be one of two types of devices.

New!!: General relativity and Transponder · See more »

## Trapped surface

Closed trapped surfaces are a concept used in black hole solutions of general relativity which describe the inner region of an event horizon.

New!!: General relativity and Trapped surface · See more »

## Twin Quasar

The Twin Quasar (also known as Twin QSO, Double Quasar, SBS 0957+561, TXS 0957+561, Q0957+561 or QSO 0957+561 A/B), was discovered in 1979 and was the first identified gravitationally lensed object.

New!!: General relativity and Twin Quasar · See more »

## Twistor theory

Twistor theory was proposed by Roger Penrose in 1967 as a possible path to quantum gravity and has evolved into a branch of theoretical and mathematical physics.

New!!: General relativity and Twistor theory · See more »

## Two-body problem in general relativity

The two-body problem (or Kepler problem) in general relativity is the determination of the motion and gravitational field of two bodies as described by the field equations of general relativity.

New!!: General relativity and Two-body problem in general relativity · See more »

## Universe

The Universe is all of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy.

New!!: General relativity and Universe · See more »

## Unruh effect

The Unruh effect (or sometimes Fulling–Davies–Unruh effect) is the prediction that an accelerating observer will observe blackbody radiation where an inertial observer would observe none.

New!!: General relativity and Unruh effect · See more »

## Urbain Le Verrier

Urbain Jean Joseph Le Verrier (11 March 1811 – 23 September 1877) was a French mathematician who specialized in celestial mechanics and is best known for predicting the existence and position of Neptune using only mathematics.

New!!: General relativity and Urbain Le Verrier · See more »

## Venus

Venus is the second planet from the Sun, orbiting it every 224.7 Earth days.

New!!: General relativity and Venus · See more »

## Very-long-baseline interferometry

Very-long-baseline interferometry (VLBI) is a type of astronomical interferometry used in radio astronomy.

New!!: General relativity and Very-long-baseline interferometry · See more »

## Virgo interferometer

The Virgo interferometer is a large interferometer designed to detect gravitational waves predicted by the general theory of relativity.

New!!: General relativity and Virgo interferometer · See more »

## Weak gravity conjecture

The weak gravity conjecture (WGC) is a conjecture regarding the strength gravity can have in a theory of quantum gravity relative to the gauge forces in that theory.

New!!: General relativity and Weak gravity conjecture · See more »

## Wheeler–DeWitt equation

The Wheeler–DeWitt equation is a field equation.

New!!: General relativity and Wheeler–DeWitt equation · See more »

## Whitehead's theory of gravitation

In theoretical physics, Whitehead's theory of gravitation was introduced by the mathematician and philosopher Alfred North Whitehead in 1922.

New!!: General relativity and Whitehead's theory of gravitation · See more »

## Wilkinson Microwave Anisotropy Probe

The Wilkinson Microwave Anisotropy Probe (WMAP), originally known as the Microwave Anisotropy Probe (MAP), was a spacecraft operating from 2001 to 2010 which measured temperature differences across the sky in the cosmic microwave background (CMB) – the radiant heat remaining from the Big Bang.

New!!: General relativity and Wilkinson Microwave Anisotropy Probe · See more »

## WKB approximation

In mathematical physics, the WKB approximation or WKB method is a method for finding approximate solutions to linear differential equations with spatially varying coefficients.

New!!: General relativity and WKB approximation · See more »

## World line

The world line (or worldline) of an object is the path that object traces in -dimensional spacetime.

New!!: General relativity and World line · See more »

## X-ray burster

X-ray bursters are one class of X-ray binary stars exhibiting periodic and rapid increases in luminosity (typically a factor of 10 or greater) that peak in the X-ray regime of the electromagnetic spectrum.

New!!: General relativity and X-ray burster · See more »

## X-ray pulsar

X-ray pulsars or accretion-powered pulsars are a class of astronomical objects that are X-ray sources displaying strict periodic variations in X-ray intensity.

New!!: General relativity and X-ray pulsar · See more »

## 1,000,000,000

1,000,000,000 (one billion, short scale; one thousand million or milliard, yard, long scale) is the natural number following 999,999,999 and preceding 1,000,000,001.

New!!: General relativity and 1,000,000,000 · See more »

## Redirects here:

Curvature of space time, Curvature of space-time, Curvature of spacetime, Curved space time, Einstein's elevator experiment, Einstein's general relativity, Einstein's general theory of relativity, General Relativity, General Relativity Theory, General Theory Of Relativity, General Theory of Relativity, General relativity resources, General relativity theory, General theory of relativity, Objections to general relativity, Space curvature, Space time curvature, Space-time curvature, Spacetime curvature, Spatial curvature, Theory of General Relativity, Theory of general relativity, Warped spacetime, Warping of space by gravity, Warping spacetime.

## References

[1] https://en.wikipedia.org/wiki/General_relativity