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Interacting Field Theories in de Sitter Space are Non-Unitary · Around

2008

Interacting Field Theories in de Sitter Space are Non-Unitary

Akhmedov, Emil T., Buividovich, P. V.

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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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