Nonequilibrium Quantum Scalar Fields in Cosmology

Abstract

We elaborate further the functional Schrödinger-picture approach to the quantum field in curved spacetimes using the generalized invariant method and construct explicitly the Fock space, which we relate with the thermal field theory. We apply the method to a free massive scalar field in the de Sitter spacetime, and find the exact quantum states, construct the Fock space, and evaluate the two-point function and correlation function.

10 pages of Latex file to appear in the Proceedings of the Fourth International Workshop on Thermal Field Theories and Their Applications, Dalian China, 1995