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Towards Cogenesis via Asymmetric Freeze-in: The chi Who Came-in from the Cold
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Towards Cogenesis via Asymmetric Freeze-in: The chi Who Came-in from the Cold
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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.
Forward citations
Cited by 1 Pith paper
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Sterile Neutrino as an Asymmetric Dark Matter
A model for asymmetric freeze-in production of Dirac sterile neutrino dark matter is proposed, but the relic density calculation ignores the symmetric component and assumes an equilibrium mediator abundance.
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