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Unitarity constraints on asymmetric freeze-in
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This paper considers unitarity and CPT constraints on asymmetric freeze-in, the use of freeze-in to store baryon number in a dark sector. In this scenario, Sakharov's out of equilibrium condition is satisfied by placing the visible and hidden sectors at different temperatures while a net visible baryon number is produced by storing negative baryon number in a dark sector. It is shown that unitarity and CPT lead to unexpected cancellations. In particular, the transfer of baryon number cancels completely at leading order.
Forward citations
Cited by 2 Pith papers
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Asymmetric dark matter from semi-annihilation: unitarity constraints and long-lived final states
A published asymmetric dark matter mechanism from semi-annihilation is shown to violate unitarity; a corrected two-species model with long-lived final states can produce the observed relic density.
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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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