http://arxiv.org/abs/2211.15703
A GeV scale self-interacting dark matter (SIDM) with a light mediator is a promising scenario to alleviate the small-scale problems of the cold dark matter (CDM) paradigm while being consistent with the latter at large scales, as suggested by astrophysical observations. Conventionally such a scenario leads to an under-abundant SIDM thermal relic due to large annihilation rates of SIDM into mediator particles. In this letter, we propose a minimal realisation of GeV scale SIDM with correct thermal relic, where one of the three singlet fermions, responsible for seesaw origin of light neutrino masses, assists in generating correct SIDM relic density via freeze-out. The singlet fermion, having mass close to but greater than that of SIDM, can lead to efficient annihilation rate into dark matter, thus compensating for the latter’s depletion due to annihilation into light mediators. In addition to providing a thermal relic generation mechanism of such light SIDM, there exist exciting discovery prospects at direct search, cosmology and dark photon search experiments. Connection to the origin of light neutrino masses also opens up indirect detection prospects due to long-lived nature of DM.
D. Borah, S. Mahapatra and N. Sahu
Wed, 30 Nov 22
1/81
Comments: 6 pages, 5 captioned figures
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