Neutrino-Lasing in The Early Universe

Details Neutrino-Lasing in The Early Universe Neutrino-Lasing in The Early Universe

1993-02-15

arxiv.org/abs/hep-ph/9302261v2

Phys.Rev.Lett. 71 (1993) 1128-1131

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages, 3 figures included as uuencoded file, CITA/93/7

Scientific paper

10.1103/PhysRevLett.71.1128

Recently, Madsen has argued that relativistic decays of massive neutrinos into lighter fermions and bosons may lead, via thermalization, to the formation of a Bose condensate. If correct, this could generate mixed hot and cold dark matter, with important consequences for structure formation. From a detailed study of such decays, we arrive at substantially different conclusions; for a wide range of masses and decay times, we find that stimulated emission of bosons dominates the decay. This phenomenon can best be described as a neutrino laser, pumped by the QCD phase transition. We discuss the implications for structure formation and the dark-matter problem.

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