Simply split SIMPs

Abstract

Dark Matter which interacts strongly with itself, but only feebly with the Standard Model is a possibility that has been entertained to solve apparent small-scale structure problems that are pertinent to the non-interacting cold Dark Matter paradigm. In this paper, we study the simple case in which the self-scattering rate today is regulated by kinematics and/or the abundance ratio, through the mass-splitting of nearly degenerate pseudo-Dirac fermions ${\chi }_1$ and ${\chi }_2$ or real scalars ${\varphi }_1$ and ${\varphi }_2$. We calculate the relic density of these states in a scenario where self-scattering proceeds through off-diagonal couplings with a vector particle $V$ (Dark Photon) and where the abundance is set through number-depleting 4-to-2 reactions in the hidden sector, or, alternatively, via freeze-in. We study the implications of the considered models and their prospect of solving astrophysical small-scale structure problems. We also show how the introduction of the (meta-)stable heavier state may be probed in future dark matter searches.

Minor changes, references added, to match the published version

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• Exploring New Physics with O(keV) Electron Recoils in Direct Detection Experiments
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• Cosmic abundances of SIMP dark matter
• Hidden Inflaton Dark Matter
• Enabling Forbidden Dark Matter
• Scalar singlet dark matter in non-standard cosmologies
• Phenomenology of Self-Interacting Dark Matter in a Matter-Dominated Universe
• WIMP miracle of the second kind
• Joint CMB and BBN Constraints on Light Dark Sectors with Dark Radiation
• Glueball scattering cross section in lattice SU(2) Yang-Mills theory
• Long-lived Dark Higgs and Inelastic Dark Matter at Belle II
• UV Freeze-in in Starobinsky Inflation
• Absorption of Sub-MeV Fermionic Dark Matter by Electron Targets
• Cannibal Dark Matter and Large Scale Structure
• Lattice studies of the $Sp(4)$ gauge theory with two fundamental and three antisymmetric Dirac fermions
• A novel way to determine the scale of inflation
• Boosting Freeze-in through Thermalization
• Non-thermal production of Dark Matter after Inflation
• Kaluza-Klein FIMP Dark Matter in Warped Extra-Dimensions
• Prospects for indirect detection of frozen-in dark matter
• Non-minimally Coupled Vector Boson Dark Matter
• Hot Leptogenesis from Thermal Dark Matter
• $Sp(2N)$ Yang-Mills theories on the lattice: scale setting and topology
• SIMPler realisation of Scalar Dark Matter
• A new mechanism of sterile neutrino dark matter production
• Unitarity Bound on Dark Matter in Low-temperature Reheating Scenarios
• FIMP Dark Matter in Clockwork/Linear Dilaton Extra-Dimensions
• Enhanced n-body annihilation of dark matter and its indirect signatures
• Exothermic dark mesons in light of electron recoil excess at XENON1T
• Boosting Assisted Annihilation for a Cosmologically Safe MeV Scale Dark Matter
• Dark Matter Freeze-out via Catalyzed Annihilation
• Dark Freeze-out Cogenesis
• Sub-MeV Self Interacting Dark Matter
• Resonant Assisted Annihilation
• Vector dark matter production from catalyzed annihilation
• Boosted dark matter from semi-annihilations in the galactic center
• MeV scale model of SIMP dark matter, neutrino mass and leptogenesis
• A model of light pseudoscalar dark matter
• Gravitational SIMPs
• Strong isospin breaking in Sp(4) gauge theory
• Extragalactic Searches for Dark Matter Annihilation
• Dark Matter Energy Deposition and Production from the Table-Top to the Cosmos
• Testing Inflationary Cosmology