Astrophysical Signatures of Secluded Dark Matter

Abstract

We analyze the indirect astrophysical signatures of secluded models of WIMP dark matter, characterized by a weak-scale rate for annihilation into light MeV-scale mediators which are metastable to decay into Standard Model states. Such scenarios allow a significant enhancement of the annihilation cross section in the galactic halo relative to its value at freeze-out, particularly when the mediator is light enough for this process to proceed through radiative capture to a metastable `WIMP-onium' bound state. For MeV-scale vector mediators charged under a hidden U(1)' gauge group, the enhanced annihilation rate leads predominantly to a sizable excess positron flux, even in the absence of astrophysical boost factors.

15 pages, 2 figures; v2: references added

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• Towards a precision calculation of $N_{\mathrm{eff}}$ in the Standard Model IV: Estimating the impact of positronium formation
• Possible spectral irregularities in the AMS-02 positron spectrum
• Dark matter annihilation and non-thermal Sunyaev-Zel'dovich effect: II. dwarf spheroidal galaxy
• Illuminating long-lived dark vector bosons via exotic Higgs decays at $\sqrt{s}=13\text{TeV}$
• Fundamental fields around compact objects: Massive spin-2 fields, Superradiant instabilities and Stars with dark matter cores
• Searching for dark matter annihilating into light long-lived mediators from stars inside dwarf spheroidal galaxies
• The Dark Photon: a 2026 Perspective
• Light dark forces at flavor factories
• Afterpulse prediction for SUBMET experiment
• Can local White Dwarfs constrain Dark Matter interactions?
• The SuperB Physics Programme
• Vector Portal Pseudo-Goldstone Dark Matter
• Fingerprints of freeze-in dark matter in an early matter-dominated era
• Generalized Dirac duality and CP violation in a two photon theory
• Cosmological Kinetic Mixing
• Higgs Model Coupled to Dark Photons
• Electroweak Physics with Polarized Electron Beams in a SuperKEKB Upgrade
• Dark Matter Energy Deposition and Production from the Table-Top to the Cosmos
• Pulsars in a Bubble? Following Electron Diffusion in the Galaxy with TeV Gamma Rays
• Indirect Searches for Secluded Dark Matter