Eternal annihilations: New constraints on long-lived particles from big-bang nucleosynthesis

Details Eternal annihilations: New constraints on long-lived particles from big-bang nucleosynthesis Eternal annihilations: New constraints on long-lived particles from big-bang nucleosynthesis

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990phrvd..41.3080f&link_type=abstract

Physical Review D (Particles and Fields), Volume 41, Issue 10, 15 May 1990, pp.3080-3085

Physics

23

Scientific paper

In the early Universe, the relative abundance of a massive weakly interacting particle species ``freezes out'' when the annihilation rate becomes less than the expansion rate. Although ineffective in reducing the total number of the species, occasional annihilations still occur after freeze-out. The residual annihilations of massive particles (10 MeV<~mX<~1 GeV) after primordial nucleosynthesis can strongly alter the light-element abundances through photodissociation. For particles with typical weak-interaction cross sections and lifetimes τX>~5×106 sec, we find that the mass range mX<~1 GeV is ruled out, independent of how they subsequently decay.

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