Causal signal transmission by quantum fields. IV: The causal Wick theorem
Quantum Physics
2015-03-19 v2 Statistical Mechanics
High Energy Physics - Theory
Mathematical Physics
math.MP
Abstract
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.
Cite
@article{arxiv.1104.3764,
title = {Causal signal transmission by quantum fields. IV: The causal Wick theorem},
author = {L. I. Plimak and S. Stenholm},
journal= {arXiv preprint arXiv:1104.3764},
year = {2015}
}
Comments
Final version, to appear in Phys Rev D