Lifetime of a massive particle in a de Sitter universe

Details Lifetime of a massive particle in a de Sitter universe Lifetime of a massive particle in a de Sitter universe

2006-12-18

arxiv.org/abs/hep-th/0612184v2

JCAP0802:003,2008

Physics

High Energy Physics

High Energy Physics - Theory

4 pages

Scientific paper

10.1088/1475-7516/2008/02/003

We study particle decay in de Sitter space-time as given by first order perturbation theory in an interacting quantum field theory. We show that for fields with masses above a critical mass $m_c$ there is no such thing as particle stability, so that decays forbidden in flat space-time do occur there. The lifetime of such a particle also turns out to be independent of its velocity when that lifetime is comparable with de Sitter radius. Particles with lower mass are even stranger: The masses of their decay products must obey quantification rules, and their lifetime is zero.

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