Some Comments on an MeV Cold Dark Matter Scenario

Abstract

We discuss several aspects of astroparticle physics pertaining to a new model with MeV cold dark matter particles, which annihilate to electron-positron pairs in a manner yielding the correct CDM density required today, and explaining the enhanced electron-positron annihilation line from the center of the Galaxy. We note that the mass of the vector meson mediating the annihilations, should exceed the mass of CDM particle, and comment on possible enhancement due to CDM clustering, on the detectability of the new CDM, and on particle physics models incorporating this scenario.

13 pages, 2 figures. v2 - Added some remarks regarding a more stringent mass bound. References added, some typos corrected. v3 - Added a comment regarding the invalidity of perturbative calculation in the case of a very small coupling g'. Removed the comment regarding the smallness of the angular width of the 511 keV line

References in corpus (4)

• Stringent Constraint on Galactic Positron Production
• Constraints on Light Dark Matter and U bosons, from psi, Upsilon, K+, pi0, eta and eta' decays
• Constraints on Light Dark Matter From Core-Collapse Supernovae
• Continuum gamma-ray emission from light dark matter positrons and electrons

Cited by in corpus (9)

• First results from DAMA/LIBRA and the combined results with DAMA/NaI
• The DAMA/LIBRA apparatus
• Investigating electron interacting dark matter
• MeV Dark Matter and Small Scale Structure
• Metastable dark matter mechanisms for INTEGRAL 511 keV $\gamma$ rays and DAMA/CoGeNT events
• Exciting dark matter in the galactic center
• Invisible Upsilon decays into Light Dark Matter
• Effects of the U-boson on the inner edge of neutron star crusts
• Asymmetric dark matter and effective number of neutrinos