Decay of long-lived particles in the early universe

Details Decay of long-lived particles in the early universe Decay of long-lived particles in the early universe

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...269....1s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 269, June 1, 1983, p. 1-12.

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43

Big Bang Cosmology, Cosmic Rays, Elementary Particles, Radioactive Decay, Relic Radiation, Universe, Background Radiation, Bremsstrahlung, Compton Effect, Elementary Particle Interactions, Galactic Evolution, Neutrinos

Scientific paper

It is pointed out that radiative decay of massive fermions can distort the cosmic background radiation. The present investigation is concerned with a study of decay lifetimes in the range from 10 to 100,000 years. Attention is given to the physics involved in determining the effect of radiative decay of massive fermions on observed photon backgrounds. The case of particles which decoupled when the effective number of species in equilibrium was in the range from 50 to 100 is considered, and constraints on particle masses and lifetimes are placed on the basis of observed photon fluxes. This approach provides results with special applications to particles predicted by supersymmetry theories and to right-handed neutrinos. Implications for galaxy formation are also discussed.

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