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arxiv: hep-th/0209159 · v2 · submitted 2002-09-19 · ✦ hep-th · astro-ph· gr-qc

Interacting Quantum Field Theory in de Sitter Vacua

Martin B. Einhorn , Finn Larsen This is my paper
classification ✦ hep-th astro-phgr-qc
keywords theoryfieldquantumsitterinteractingspacevacuumambiguity
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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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