The lifetime of a massive particle in a de Sitter universe
Abstract
We study particle decay in de Sitter spacetime as given by firstorder 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 spacetime do occur there. The lifetime of such a particle also turns out to be independent of its velocity when that lifetime is comparable with the 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.
 Publication:

Journal of Cosmology and Astroparticle Physics
 Pub Date:
 February 2008
 DOI:
 10.1088/14757516/2008/02/003
 arXiv:
 arXiv:hepth/0612184
 Bibcode:
 2008JCAP...02..003B
 Keywords:

 High Energy Physics  Theory
 EPrint:
 4 pages