Coscattering in next-to-minimal dark matter and split supersymmetry

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 $\mu$.

arXiv comment17 pages, 4 figures; v2: references added, matches journal version

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• micrOMEGAs 6.0: N-component dark matter
• DRAKE: Dark matter Relic Abundance beyond Kinetic Equilibrium
• Bound-state effects on dark matter coannihilation: Pushing the boundaries of conversion-driven freeze-out
• Co-scattering in micrOMEGAs: a case study for the singlet-triplet dark matter model
• Forbidden dark matter annihilation into leptons with full collision terms
• Early kinetic decoupling effect on the forbidden dark matter annihilations into standard model particles
• Langevin simulation of dark matter kinetic equilibration
• Resonant ALP-Portal Dark Matter Annihilation as a Solution to the $B^{\pm }\to K^{\pm }\nu \bar{\nu }$ Excess
• Illuminating Scalar Dark Matter Co-Scattering in EFT with Monophoton Signatures
• Reviving $Z^{\prime }$ Portal Dark Matter with Conversion Mechanism