Mathematics – Logic
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993phrvd..48..562d&link_type=abstract
Physical Review D (Particles, Fields, Gravitation, and Cosmology), Volume 48, Issue 2, 15 July 1993, pp.562-566
Mathematics
Logic
4
Particle-Theory And Field-Theory Models Of The Early Universe, Origin, Formation, And Abundances Of The Elements
Scientific paper
We derive improved cosmological constraints on decaying particles which produce neutrinos but no electromagnetically or strongly interacting particles in their decay. The neutrinos produced in these decays can annihilate with cosmic background antineutrinos or antineutrinos produced in the decay to yield e+e- pairs which generate cascades of photons that fission light elements. Annihilation off of both background and decay neutrinos is included; we find that the latter is the dominant thermalization and photofission mechanism over most of the parameter range we have examined. Limits on the mass, abundance, and lifetime of neutrino-producing decaying particles are determined from the overproduction of D+3He from the fission of 4He. These are combined with limits on the present density of the relativistic decay products to yield lifetime-independent limits on the decaying particle abundance and mass. Results are applied to the specific example of a gravitino which decays into a neutrino and a sneutrino.
de Laix Andrew A.
Scherrer Robert J.
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