The Contour Time Path
نویسنده
چکیده
In this report various aspects of Finite Temperature and Density Quantum Field Theory are discussed. The main point being the calculation of Green’s functions in this context, in which pertubation theory is used. The motivation for calculating Green’s functions comes from their wide application in modern Physics. The techniques that are presented here are used in such areas as condensed matter, super conductors and super fluidity, nuclear and elementary particle physics. 1 The Initial Problem The initial situation is a non-relativistic many body problem in the Heisenberg picture. For this the Hamitonian Operator in the second quantisation is used:
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