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Exchange driven freeze out of dark matter
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We introduce a novel mechanism where processes that preserve the number density of the dark sector set the relic density of a thermal particulate dark matter. In a relatively degenerate multipartite dark sector if there is a considerable time lapse between the freeze out of various species then a process like exchange between dark sector constituents can play the pivotal role of driving freeze out and setting dark matter relic density. As a proof of principle, we present simple scalar models with viable dark matter in the GeV scale to demonstrate this phenomenon.
Forward citations
Cited by 3 Pith papers
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Conversions in two-component dark sectors: a phase space level analysis
In the double Coy dark matter model, full phase-space Boltzmann evolution with conversions changes relic abundances by up to an order of magnitude per component and by more than 100% for the total in some parameter regions.
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In the inverse scotogenic model, nearly degenerate Z2-odd scalars φ1 and φ2 produce the observed dark matter relic density via coscattering through either the Higgs portal or Yukawa portal, with long-lived φ2 decays g...
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Reviving $Z^\prime$ Portal Dark Matter with Conversion Mechanism
In a U(1)_{B-L} Z' portal model with two nearly degenerate dark fermions, the conversion mechanism can produce the observed dark matter relic density while evading current collider and direct-detection constraints.
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