Neutrino astronomy and massive long-lived particles from the big bang

Details Neutrino astronomy and massive long-lived particles from the big bang Neutrino astronomy and massive long-lived particles from the big bang

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992nuphb.380..478b&link_type=abstract

Nuclear Physics B, Volume 380, Issue 3, p. 478-506.

Physics

Nuclear Physics

25

Scientific paper

We consider the neutrino flux from the decay of long-lived big-bang particles. The red-shift ztr at which the neutrino transparency of the universe sets in is calculated as a function of neutrino energy: ztr ≅ 1 × 105 for TeV neutrinos and ztr ≅ 3 × 106 for 10 MeV neutrinos. One might expect the production of detectable neutrino flux at z <~ ztr, but, as demonstrated in this paper, the various upper limits, most notably due to nucleosynthesis and diffuse X- and gamma-rays, preclude this possibility. Unless the particle decay is strongly dominated by the pure neutrino channel, observable neutrino flux can be produced only at the current epoch, corresponding to red-shift z ~ 0. For the thermal relics which annihilate through the gauge bosons of SU(3)×SU(2)×U(1) group, the neutrino flux can be marginally detectable at 0.1 < Ev < 10 TeV. As an example of non-thermal relics we consider gravitinos. If gravitinos are the lightest supersymmetric particles (LSP) they can produce the detectable neutrino flux in the form of a neutrino line with energy Ev = 1/2MG, where MG is the gravitino mass. The flux strongly depends on the mechanisms of R-parity violation. It is shown that heavy gravitinos (MG <~ 100 GeV) can make up the dark matter in the universe.

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