Wick's Theorem at Finite Temperature

Details Wick's Theorem at Finite Temperature Wick's Theorem at Finite Temperature

1996-01-15

arxiv.org/abs/hep-ph/9601268v1

Nucl.Phys. B474 (1996) 481-496

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, LaTeX (no figures), available through anonymous ftp as LaTeX from ftp://euclid.tp.ph.ic.ac.uk/papers/95-6_18.tex or

Scientific paper

10.1016/0550-3213(96)00286-6

We consider Wick's Theorem for finite temperature and finite volume systems. Working at an operator level with a path ordered approach, we show that contrary to claims in the literature, expectation values of normal ordered products can be chosen to be zero and that results obtained are independent of volume. Thus the path integral and operator approaches to finite temperature and finite volume quantum field theories are indeed seen to be identical. The conditions under which normal ordered products have simple symmetry properties are also considered.

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