Four-point functions in Keldysh basis

Details Four-point functions in Keldysh basis Four-point functions in Keldysh basis

2001-05-30

arxiv.org/abs/hep-ph/0105313v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

27 pages, 2 figures, latex2e

Scientific paper

The Keldysh three- and four-point functions are related to analytical
continuations of the Imaginary Time amplitudes,in momentum space. The relation
provides an interesting interpretation of the amplitudes that are specific to
the Keldysh basis, and of the Ward Identities they satisfy in QED. The
interpretation carries over to the (perturbative) non-equilibrium case.

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