scholarly journals Limits on dark matter annihilation cross sections to gamma-ray lines with subhalo distributions in N -body simulations and Fermi LAT data

2017 ◽  
Vol 95 (6) ◽  
Author(s):  
Yun-Feng Liang ◽  
Zi-Qing Xia ◽  
Kai-Kai Duan ◽  
Zhao-Qiang Shen ◽  
Xiang Li ◽  
...  
Keyword(s):  
Dark Matter ◽  
Cross Sections ◽  
Gamma Ray ◽  
Dark Matter Annihilation

scholarly journals Gamma-Ray Effects of Dark Forces in Dark Matter Clumps

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
K. Belotsky ◽  
M. Khlopov ◽  
A. Kirillov
Keyword(s):  
Dark Matter ◽  
Cross Sections ◽  
Gamma Ray ◽  
Mass Density ◽  
Diffuse Radiation ◽  
Interaction Constant ◽  
Small Scale ◽  
Annihilation Rate ◽  
Dark Matter Annihilation ◽  
Ray Effects

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 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 velocitiesvof 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 diffuseγ-radiation. Both data on diffuse radiation and data on PGS put lower constraints on annihilation cross section at any dark interaction constant, where diffuse radiation provides stronger constraint at smaller clump mass. Density of annihilating DM particles is conventionally supposed to be defined by the frozen annihilation processes in early Universe.

scholarly journals Dark matter annihilation or unresolved astrophysical sources? Anisotropy probe of the origin of the cosmic gamma-ray background

2007 ◽  
Vol 75 (6) ◽  
Author(s):  
Shin’ichiro Ando ◽  
Eiichiro Komatsu ◽  
Takuro Narumoto ◽  
Tomonori Totani
Keyword(s):  
Dark Matter ◽  
Gamma Ray ◽  
Dark Matter Annihilation
Sign in / Sign up

Export Citation Format

Share Document