http://arxiv.org/abs/2301.00209
Elastic collisions with relativistic electrons from the blazar’s jet can accelerate dark matter (DM) particles in the DM spike surrounding the supermassive black hole at its center. This can allow one to set limits on the DM-electron scattering cross section ($\bar{\sigma}_{e\chi}$) for DM masses less than 100 MeV, which has been found to be orders of magnitude stronger than the equivalent results from cosmic rays for energy-independent cross-section (by Granelli et al. (2022)). We also consider DM particles boosted by energetic electrons in the jets of the blazars TXS 0506+056 and BL Lacertae. In this study, we consider both vector and scalar mediators for the scattering of electron and electrophilic fermionic DM. We highlight that the ensuing energy dependency of the S-matrix for the corresponding Lorentz structure of the vertex significantly modifies the constraints. We found that the revised exclusion limits are atleast three orders of magnitude stronger than the conclusions drawn from the simple constant crosssection assumption. Our limits are also assessed for the less cuspy spike.
S. Bhowmick, D. Ghosh and D. Sachdeva
Tue, 3 Jan 23
35/49
Comments: 11 pages, 7 figures
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