Interacting Field Theories in de Sitter Space are Non-Unitary

Details Interacting Field Theories in de Sitter Space are Non-Unitary Interacting Field Theories in de Sitter Space are Non-Unitary

2008-08-29

arxiv.org/abs/0808.4106v2

Phys.Rev.D78:104005,2008

Physics

High Energy Physics

High Energy Physics - Theory

10 pages RevTeX, 1 figure. Additional arguments are given, statements are made more precise

Scientific paper

10.1103/PhysRevD.78.104005

It is well known that there should be a total cancellation of the IR divergences in unitary interacting field theories, such as QED and gravity. The cancellation should be at all orders between loop and tree level contributions to cross--sections. This is the crucial fact related to the unitarity of the evolution operator (S--matrix) of the underlying interacting field theory. In this note we show that such a cancellation does {\it not} happen in de Sitter space.

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