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Coscattering in next-to-minimal dark matter and split supersymmetry
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abstract
In some models of thermal relic dark matter, the relic abundance may be set by inelastic scattering processes (rather than annihilations) becoming inefficient as the universe cools down. This effect has been called coscattering. We present a procedure to numerically solve the full momentum-dependent Boltzmann equations in coscattering, which allows for a precise calculation of the dark matter relic density including the effects of early kinetic decoupling. We apply our method to a simple model, containing a fermionic SU(2) triplet and a fermionic singlet with electroweak-scale masses, at small triplet-singlet mixing. The relic density can be set by either coannihilation or, at values of the mixing angle $\theta\lesssim 10^{-5}$, by coscattering. We identify the parameter ranges which give rise to the observed relic abundance. As a special case, we study bino-like dark matter in split supersymmetry at large $\mu$.
Forward citations
Cited by 3 Pith papers
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Coscattering Dark Matter in the Inverse Scotogenic Models
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
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