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Infrared divergence

Index Infrared divergence

In physics, an infrared divergence (also IR divergence or infrared catastrophe) is a situation in which an integral, for example a Feynman diagram, diverges because of contributions of objects with very small energy approaching zero, or, equivalently, because of physical phenomena at very long distances. [1]

20 relations: BPST instanton, Catastrophe, Cutoff (physics), Divergence (disambiguation), Gross–Neveu model, Index of physics articles (I), Infraparticle, Infrared safety (particle physics), John Clayton Taylor, Kinoshita-Lee-Nauenberg theorem, List of infrared articles, List of mathematical topics in quantum theory, Mihai Gavrilă, One-loop Feynman diagram, QCD vacuum, Renormalization, Soft photon, Soft-collinear effective theory, Steven Frautschi, Ultraviolet divergence.

BPST instanton

In theoretical physics, the BPST instanton is the instanton with winding number 1 found by Alexander Belavin, Alexander Polyakov, Albert Schwarz and Yu. S. Tyupkin.

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Catastrophe

Catastrophe or catastrophic comes from the Greek κατά (kata).

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Cutoff (physics)

In theoretical physics, cutoff is an arbitrary maximal or minimal value of energy, momentum, or length, used in order that objects with larger or smaller values than these physical quantities are ignored in some calculation.

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Divergence (disambiguation)

Divergence is a function that associates a scalar with every point of a vector field.

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Gross–Neveu model

The Gross–Neveu model is a quantum field theory model of Dirac fermions interacting via four fermion interactions in 1 spatial and 1 time dimension.

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Index of physics articles (I)

The index of physics articles is split into multiple pages due to its size.

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Infraparticle

An infraparticle is an electrically charged particle and its surrounding cloud of soft photons—of which there are infinite number, by virtue of the infrared divergence of quantum electrodynamics.

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Infrared safety (particle physics)

In particle physics, and especially asymptotically free quantum field theories, an observable is infrared safe if it does not depend on the low energy/long distance physics of the theory.

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John Clayton Taylor

John Clayton Taylor (born 4 August 1930) is a British mathematical physicist.

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Kinoshita-Lee-Nauenberg theorem

The Kinoshita–Lee–Nauenberg theorem or KLN theorem states that perturbatively the standard model as a whole is infrared (IR) finite.

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List of infrared articles

This is a list of Infrared topics.

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List of mathematical topics in quantum theory

This is a list of mathematical topics in quantum theory, by Wikipedia page.

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Mihai Gavrilă

Mihai Gavrilă (b. October 16, 1929, Cluj) is a Romanian quantum physicist, member of the Romanian Academy since 1974.

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One-loop Feynman diagram

In physics, a one-loop Feynman diagram is a connected Feynman diagram with only one cycle (unicyclic).

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QCD vacuum

Th Quantum Chromodynamic Vacuum or QCD vacuum is the vacuum state of quantum chromodynamics (QCD).

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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.

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Soft photon

In particle physics, soft photons are photons with energies much smaller than the energies of the particles participating in a particular scattering process, and they are not energetic enough to be detected.

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Soft-collinear effective theory

In quantum field theory, soft-collinear effective theory (or SCET) is a theoretical framework for doing calculations that involve interacting particles carrying widely different energies.

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Steven Frautschi

Steven C. Frautschi (born December 6, 1933) is an American theoretical physicist, currently professor of physics emeritus at the California Institute of Technology (Caltech).

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Ultraviolet divergence

In physics, an ultraviolet divergence or UV divergence is a situation in which an integral, for example a Feynman diagram, diverges because of contributions of objects with unbounded energy, or, equivalently, because of physical phenomena at infinitesimal distances.

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Redirects here:

IR divergence, Infrared catastrophe, Infrared divergences.

References

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

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