Interacting Field Theories in de Sitter Space are Non-Unitary
High Energy Physics - Theory
2008-11-26 v2 General Relativity and Quantum Cosmology
High Energy Physics - Phenomenology
Abstract
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.
Keywords
Cite
@article{arxiv.0808.4106,
title = {Interacting Field Theories in de Sitter Space are Non-Unitary},
author = {Emil T. Akhmedov and P. V. Buividovich},
journal= {arXiv preprint arXiv:0808.4106},
year = {2008}
}
Comments
10 pages RevTeX, 1 figure. Additional arguments are given, statements are made more precise