Fingerprints of freeze-in dark matter in an early matter-dominated era
Avik Banerjee, Debtosh Chowdhury
SciPost Phys. 13, 022 (2022) · published 16 August 2022
- doi: 10.21468/SciPostPhys.13.2.022
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Abstract
We study the impact of an alternate cosmological history with an early matter-dominated epoch on the freeze-in production of dark matter. Such early matter domination is triggered by a meta-stable matter field dissipating into radiation. In general, the dissipation rate has a non-trivial temperature and scale factor dependence. Compared to the usual case of dark matter production via the freeze-in mechanism in a radiation-dominated universe, in this scenario, orders of magnitude larger coupling between the visible and the dark sector can be accommodated. Finally, as a proof of principle, we consider a specific model where the dark matter is produced by a sub-GeV dark photon having a kinetic mixing with the Standard Model photon. We point out that the parameter space of this model can be probed by the experiments in the presence of an early matter-dominated era.
Cited by 12
Authors / Affiliations: mappings to Contributors and Organizations
See all Organizations.- 1 Chalmers Tekniska Högskola / Chalmers University of Technology
- 2 भारतीय प्रौद्योगिकी संस्थान कानपुर / Indian Institute of Technology Kanpur [IITK]
- Indian Institute of Technology Kanpur
- Knut och Alice Wallenbergs Stiftelse (Knut and Alice Wallenberg Foundation) (through Organization: Knut och Alice Wallenbergs Stiftelse / Knut and Alice Wallenberg Foundation)
- Science and Engineering Research Board [SERB]