Causal signal transmission by quantum fields. IV: The causal Wick theorem

Details Causal signal transmission by quantum fields. IV: The causal Wick theorem Causal signal transmission by quantum fields. IV: The causal Wick theorem

2011-04-19

arxiv.org/abs/1104.3764v2

Physics

Quantum Physics

Final version, to appear in Phys Rev D

Scientific paper

Wick's theorem in the Schwinger-Perel-Keldysh closed-time-loop formalism is
written in a form where the place of contractions is taken by the linear
response function of the field. This result demonstrates that the physical
information supplied by Wick's theorem for operators is propagation of the free
field in space and time.

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