Impeded Dark Matter

Abstract

We consider dark matter models in which the mass splitting between the dark matter particles and their annihilation products is tiny. Compared to the previously proposed Forbidden Dark Matter scenario, the mass splittings we consider are much smaller, and are allowed to be either positive or negative. To emphasize this modification, we dub our scenario "Impeded Dark Matter". We demonstrate that Impeded Dark Matter can be easily realized without requiring tuning of model parameters. For negative mass splitting, we demonstrate that the annihilation cross-section for Impeded Dark Matter depends linearly on the dark matter velocity or may even be kinematically forbidden, making this scenario almost insensitive to constraints from the cosmic microwave background and from observations of dwarf galaxies. Accordingly, it may be possible for Impeded Dark Matter to yield observable signals in clusters or the Galactic center, with no corresponding signal in dwarfs. For positive mass splitting, we show that the annihilation cross-section is suppressed by the small mass splitting, which helps light dark matter to survive increasingly stringent constraints from indirect searches. As specific realizations for Impeded Dark Matter, we introduce a model of vector dark matter from a hidden $SU(2)$ sector, and a composite dark matter scenario based on a QCD-like dark sector.

26 pages, 4 figures, 3 tables; references added, v3: matched to Journal version; v4: corrected typos in Appendix B, numerical results are not affected;

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• Cosmological Bounds on Non-Abelian Dark Forces
• Concentrated Dark Matter: Enhanced Small-scale Structure from Co-Decaying Dark Matter
• Joint CMB and BBN Constraints on Light Dark Sectors with Dark Radiation
• Glueball scattering cross section in lattice SU(2) Yang-Mills theory
• Terrestrial and Martian Heat Flow Limits on Dark Matter
• A Tale of Two Portals: Testing Light, Hidden New Physics at Future $e^{+}{e}^{-}$ Colliders
• Light Dark Matter from Leptogenesis
• Les Houches Lectures on Indirect Detection of Dark Matter
• A Theory of Dark Pions
• Exchange driven freeze out of dark matter
• Feeble neutrino portal dark matter at neutrino detectors
• Cannibal domination and the matter power spectrum
• Light Dark Sectors through the Fermion Portal
• Non-Abelian Vector Boson Dark Matter, its Unified Route and signatures at the LHC
• Tests of Neutrino and Dark Radiation Models from Galaxy and CMB surveys
• Spin-dependent sub-GeV Inelastic Dark Matter-electron scattering and Migdal effect: (I). Velocity Independent Operator
• Examining the origin of dark matter mass at colliders
• Faint Dark Matter Annihilation Signals and the Milky Way's Supermassive Black Hole
• Scalar Co-SIMP Dark Matter: Models and Sensitivities
• Dark Freeze-out Cogenesis
• Accretion of Dissipative Dark Matter onto Active Galactic Nuclei
• Explanation of the 511 keV line: Cascade annihilating dark matter with the ${}^8$Be anomaly
• Interpretation of the gamma-ray excess and AMS-02 antiprotons: Velocity dependent dark matter annihilations
• Dark Matter as a remnant of SQCD Inflation
• Dark Matter in Very Supersymmetric Dark Sectors
• Searching for velocity-dependent dark matter annihilation signals from extragalactic halos
• Bouncing Dark Matter
• Final state Sommerfeld effect on dark matter relic abundance
• Optimal observing strategies for velocity-suppressed dark matter annihilation
• Velocity-dependent self-interacting dark matter from thermal freeze-out and tests in direct detections
• WIMP Dark Matter from a Natural Discrete Gauge Symmetry in the Standard Model
• Final bound-state formation effect on dark matter annihilation
• Phenomenology of the Hidden SU(2) Vector Dark Matter Model