de Sitter Vacua, Renormalization and Locality

Details de Sitter Vacua, Renormalization and Locality de Sitter Vacua, Renormalization and Locality

2002-09-13

arxiv.org/abs/hep-th/0209113v2

Phys.Rev. D67 (2003) 065009

Physics

High Energy Physics

High Energy Physics - Theory

JHEP Latex, 13 pages, v2. references added

Scientific paper

10.1103/PhysRevD.67.065009

We analyze the renormalization properties of quantum field theories in de Sitter space and show that only two of the maximally invariant vacuum states of free fields lead to consistent perturbation expansions. One is the Euclidean vacuum, and the other can be viewed as an analytic continuation of Euclidean functional integrals on $RP^d$. The corresponding Lorentzian manifold is the future half of global de Sitter space with boundary conditions on fields at the origin of time. We argue that the perturbation series in this case has divergences at the origin, which render the future evolution of the system indeterminate without a better understanding of high energy physics.

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