The Spectrum of Darkonium in the Sun

Abstract

Dark matter that gets captured in the Sun may form positronium-like bound states if it self-interacts via light dark photons. In this case, dark matter can either annihilate to dark photons or recombine in bound states which subsequently also decay to dark photons. The fraction of the dark photons that leave the Sun without decaying to Standard Model particles have a characteristic energy spectrum which is a mixture of the direct annihilation process, the decays of ortho- and para- bound states and the recombination process. The ultimate decay of these dark photons to positron-electron pairs (via kinetic mixing) outside the Sun creates a distinct signal that can either identify or set strict constraints on dark photon models.

24 pages, 7 figures

References in corpus (7)

• Too big to fail? The puzzling darkness of massive Milky Way subhaloes
• Secluded WIMP Dark Matter
• Bound-state formation for thermal relic dark matter and unitarity
• Dark matter constraints from box-shaped gamma-ray features
• Cosmological Constraints on Very Dark Photons
• Lepton Jets from Radiating Dark Matter
• Classical scattering in strongly attractive potentials

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• Solar Gamma Ray Constraints on Dark Matter Annihilation to Secluded Mediators
• Higgs-mediated bound states in dark-matter models
• Supernova Constraint on Self-Interacting Dark Sector Particles
• Jupiter missions as probes of dark matter
• Zero-Range Effective Field Theory for Resonant Wino Dark Matter I. Framework
• Neutron star mass in dark matter clumps
• Super-Kamiokande Strongly Constrains Leptophilic Dark Matter Capture in the Sun