irreducible Feynman diagram

См. также в других словарях:

• Feynman diagram — The Wick s expansion of the integrand gives (among others) the following termNarpsi(x)gamma^mupsi(x)arpsi(x )gamma^ upsi(x )underline{A mu(x)A u(x )};,whereunderline{A mu(x)A u(x )}=int{d^4pover(2pi)^4}{ig {mu u}over k^2+i0}e^{ k(x x )}is the… …   Wikipedia

• Feynman graph — A Feynman graph is a graph suitable to be a Feynman diagram in a particular application of quantum field theory. (The most common use is when each field has quanta (particles) associated with it as the quantum of the electromagnetic field is a… …   Wikipedia

• Dirac equation — Quantum field theory (Feynman diagram) …   Wikipedia

• Effective action — In quantum field theory, the effective action is a modified expression for the action, which takes into account quantum mechanical corrections, in the following sense: In classical mechanics, the equations of motion can be derived from the action …   Wikipedia

• Correlation function (quantum field theory) — For other uses, see Correlation function (disambiguation). Quantum field theory …   Wikipedia

• S-matrix — Scattering matrix redirects here. For the meaning in linear electrical networks, see scattering parameters. In physics, the scattering matrix (S matrix) relates the initial state and the final state for an interaction of particles. It is used in… …   Wikipedia

• Antiparticle — The laws of nature are very nearly symmetrical with respect to particles and antiparticles. For example, an antiproton and a positron can form an antihydrogen atom, which has almost exactly the same properties as a hydrogen atom. A physicist… …   Wikipedia