Abstract
We study particle decay in de Sitter spacetime as given by first-order perturbation theory in aninteracting quantum field theory. We show that for fields with masses above a critical massmc there is no such thing as particle stability, so that decays forbidden in flat spacetime dooccur there. The lifetime of such a particle also turns out to be independent of its velocitywhen that lifetime is comparable with the de Sitter radius. Particles with lower mass areeven stranger: the masses of their decay products must obey quantification rules, and theirlifetime is zero.
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