Gamma-ray effects of dark forces in dark matter clumps

Abstract

Existence of new gauge U(1) symmetry possessed by dark matter (DM) particles implies the existence of a new Coulomb-like interaction, which leads to Sommerfeld-Gamow-Sakharov enhancement of dark matter annihilation at low relative velocities. We discuss a possibility to put constraints on the such dark forces of dark matter from the observational data on the gamma radiation in our Galaxy. Gamma-rays are supposed to originate from annihilation of DM particles in the small scale clumps, in which annihilation rate is supposed to be enhanced, besides higher density, due to smaller relative velocities $v$ of DM particles. For possible cross sections, mass of annihilating particles, masses of clumps and the contribution of annihilating particles in the total DM density we constrain the strength of new dark long range forces from comparison of predicted gamma ray signal with Fermi/LAT data on unidentified point-like gamma-ray sources (PGS) as well as on diffuse $\gamma$-radiation.

Accepted to Advances in High Energy Physics. arXiv admin note: text overlap with arXiv:1212.6087

References in corpus (12)

• The Cosmology of Atomic Dark Matter
• Early supersymmetric cold dark matter substructure
• Dark Matter Annihilation in Substructures Revised
• Unidentified sources in the Fermi-LAT second source catalog: the case for DM subhalos
• Proper motion of gamma-rays from microhalo sources
• The cosmic X-ray and gamma-ray background from dark matter annihilation
• The 130 GeV gamma-ray line and Sommerfeld enhancements
• Gamma-ray evidences of the dark matter clumps
• Clusters of Black Holes as Point-Like Gamma-ray Sources
• Composite Dark Matter and its Charged Constituents
• Effects of new long-range interaction: Recombination of relic Heavy neutrinos and antineutrinos
• Structure Formation Constraints on Sommerfeld-Enhanced Dark Matter Annihilation

Cited by in corpus (1)

• Hadronic and hadron-like physics of Dark Matter