Towards Cogenesis via Asymmetric Freeze-in: The $\chi$ Who Came-in from the Cold

Abstract

In models of freeze-in the dark matter (DM) is decoupled from the visible sector and initially has a depleted number density. The hidden and visible sectors are connected only via a feeble portal interaction by which DM can be produced. Asymmetric freeze-in (AFI) combines this scenario with ideas from asymmetric DM and provides a potential cogenesis mechanism. However, it has been argued that existing AFI models do not produce suitably large particle asymmetries due to cancellations which arises because the mediator state remains in thermal equilibrium. We examine AFI via an out-of-equilibrium mediator and using a simple scalar model show that in this case sizeable asymmetries may be generated.

18 pages

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• Unified origin of baryons and dark matter
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Cited by in corpus (9)

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• Mechanism for baryogenesis via feebly interacting massive particles
• Ultraviolet freeze-in baryogenesis
• Asymmetries in Extended Dark Sectors: A Cogenesis Scenario
• Genesis of baryon and dark matter asymmetries through ultraviolet scattering freeze-in
• Oscillation Baryogenesis via Ultraviolet Dark Matter Freeze-In
• Freeze-in Leptogenesis via Dark-Matter Oscillations