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 8
Authors / Affiliations: mappings to Contributors and OrganizationsSee 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]