MeV gamma-ray constraints for light dark matter from semi-annihilation

Exploring the realm of Dark Matter research, Light DM, which has a mass in the range of 1 MeV to 1 GeV, is a fascinating topic both theoretically and experimentally. We assume that the light dark matter is composed of complex scalars and produced from semi-annihilation, which is close to the scale of the MeV Gamma-ray satellite, allowing us to explore the implications of this hypothesis. The experimental data we used to constrain the scenario is from five different sources: the COMPTEL, EGRET, INTEGRAL, Fermi Gamma-ray Space Telescope, and the e-ASTROGAM future reach. We use the analytical formula to measure the X-ray spectra allowing us to determine the annihilation cross-section bounds from 10-28 cm3/s to 10-22 cm3/s for different combinations of dark matter and mediator masses. We found that the MeV gamma-ray provides valuable insight into the structure of the semi-annihilation dark matter, where EGRET contributes to the stringent constraint to the semi-annihilation, and the eASTROGAM future reach could probe the whole parameter space of the model.(c) 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons .org /licenses /by /4 .0/). Funded by SCOAP3.

Automated summary

Light DM with a mass in the range of 1 MeV to 1 GeV is a fascinating topic in Dark Matter research. The study assumes that light dark matter is composed of complex scalars and produced from semi-annihilation. Experimental data from different sources is used to constrain the scenario, and the X-ray spectra are analyzed to determine the annihilation cross-section bounds for different combinations of dark matter and mediator masses. MeV gamma-ray provides valuable insight into the structure of semi-annihilation dark matter, and EGRET contributes to the stringent constraint on semi-annihilation.