Self-interacting freeze-in dark matter in a singlet doublet scenario

Abstract

We examine the non-thermal production of dark matter in a scalar extended singlet doublet fermion model where the lightest admixture of the fermions constitutes a suitable dark matter candidate. The dark sector is non-minimal with the MeV scale singlet scalar, which is stable in the Universe lifetime and can mediate the self-interaction for the multi-GeV fermion dark matter mitigating the small scale structure anomalies of the Universe. If the dark sector is strongly coupled, it undergoes internal dark thermal equilibrium after freeze-in production, and we end up with suppressed relic abundance for the fermion dark matter in a radiation dominated Universe. In contrast, the presence of a modified cosmological phase in the early era drives the fermion dark matter to satisfy nearly the whole amount of observed relic. It also turns out that the assumption of an unconventional cosmological history can allow the GeV scale dark matter to be probed at LHC from displaced vertex signature with improved sensitivity.

9 figures, 23 pages, comments are welcome

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• CMB signature of non-thermal Dark Matter produced from self-interacting dark sector
• Thermally corrected masses and freeze-in dark matter: a case study
• Jet substructure probe to unfold singlet-doublet dark matter in the presence of non-standard cosmology
• Anatomy of singlet-doublet dark matter relic: annihilation, co-annihilation, co-scattering, and freeze-in
• Dynamics of the pseudo-FIMP in presence of a thermal Dark Matter
• Collider fingerprints of freeze-in dark matter produced during the fast expansion phase of Universe
• Feebly-interacting dark matter
• Distinguishing thermal histories of dark matter from structure formation
• Light Thermal Self-Interacting Dark Matter in the Shadow of Non-Standard Cosmology
• Darker matter generating from the dark
• Gravitational Wave Probe of Singlet-Doublet Dark Matter Induced Radiative Neutrino Mass