Gravitational contact terms
id:
gravitational-contact-terms-238-2433701
title:
Gravitational contact terms
text:
In quantum field theory, a contact term is a radiatively induced point-like interaction. These typically occur when the vertex for the emission of a massless particle such as a photon, a graviton, or a gluon, is proportional to q 2 .
This factor cancels the 1 / q 2 of the Feynman propagator, and causes the exchange of the massless particle to produce a point-like δ -function effective interaction, rather than the usual ∼ 1 / r long-range potential. A notable example occurs in the weak interactio
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wiki
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encyclopedia
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original url:
https://en.wikipedia.org/wiki/Gravitational_contact_terms
date created:
date modified:
2023-11-06T15:47:21Z
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13
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