Unstable Relics as a Source of Galactic Positrons

Details Unstable Relics as a Source of Galactic Positrons Unstable Relics as a Source of Galactic Positrons

2004-02-18

arxiv.org/abs/hep-ph/0402178v3

Phys.Lett. B605 (2005) 15-25

Physics

High Energy Physics

High Energy Physics - Phenomenology

Latex, 14 pages, 3 figures, Calculation of cosmological background is included

Scientific paper

10.1016/j.physletb.2004.11.025

We calculate the fluxes of 511 KeV photons from the Galactic bulge caused by positrons produced in the decays of relic particles with masses less than 100 MeV. In particular, we tighten the constraints on sterile neutrinos over a large domain of the mass--mixing angle parameter space, where the resulting photon flux would significantly exceed the experimental data. At the same time, the observed photon fluxes can be easily caused by decaying sterile neutrinos in the mass range 1 MeV < m_sterile < 50 MeV with the cosmological abundance typically within 10^{-9} < Omega_sterile < 10^{-5}, assuming that Omega_sterile comes entirely from the conversion of active neutrinos in the early Universe. Other candidates for decaying relics such as neutral (pseudo)scalar particles coupled to leptons with the gravitational strength can be compatible with the photon flux, and can constitute the main component of cold dark matter.

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