Séminaire de Physique Théorique
Interacting Field Theories in de Sitter Space are Non-UnitaryEmil Akhmedov (ITEP, Moscow)
Friday 12 December 2008 14:00 - Tours - Salle 1180 (Bât E2)
Résumé :
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 not happen in de Sitter space. Based on: arXiv:0808.4106v2 [hep-th]
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