Interacting Quantum Field Theory in de Sitter Vacua

Details Interacting Quantum Field Theory in de Sitter Vacua Interacting Quantum Field Theory in de Sitter Vacua

2002-09-19

arxiv.org/abs/hep-th/0209159v2

Phys.Rev. D67 (2003) 024001

Physics

High Energy Physics

High Energy Physics - Theory

34 pages including 5 figures

Scientific paper

10.1103/PhysRevD.67.024001

We discuss interacting quantum field theory in de Sitter space and argue that the Mottola-Allen vacuum ambiguity is an artifact of free field theory. The nature of the nonthermality of the MA-vacua is also clarified. We propose analyticity of correlation functions as a fundamental requirement of quantum field theory in curved spacetimes. In de Sitter space, this principle determines the vacuum unambiguously and facilitates the systematic development of perturbation theory.

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