Galactic Origin of Relativistic Bosons and XENON1T Excess

Abstract

We entertain the exotic possibility that dark matter (DM) decays or annihilations taking place in our galaxy may produce a flux of relativistic very weakly-coupled bosons, axions or dark photons. We show that there exist several upper bounds for this flux on Earth assuming generic minimal requirements for DM, such as a lifetime longer than the age of the Universe or an annihilation rate that leaves unaffected the background evolution during matter domination. These bounds do not depend on the identity or the couplings of the bosons. We then show that this new flux cannot be large enough to explain the recent XENON1T excess, while assuming that the bosons' couplings to the Standard Model are consistent with all current experimental and observational constraints. We also discuss a possible caveat to these bounds and a route to explain the excess.

arXiv comment12 pages, 1 figure. Version accepted for publication

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• New limits on dark photons from solar emission and keV scale dark matter
• Direct detection of dark energy: the XENON1T excess and future prospects
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• An Active-to-Sterile Neutrino Transition Dipole Moment and the XENON1T Excess
• Probing the relaxed relaxion and Higgs-portal with S1 & S2
• On-shell mediator dark matter models and the Xenon1T anomaly
• Exothermic Dark Matter for XENON1T Excess
• Collider Constraints on a Dark Matter Interpretation of the XENON1T Excess
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• Deep learning the astrometric signature of dark matter substructure
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• Explorations of pseudo-Dirac dark matter having keV splittings and interacting via transition electric and magnetic dipole moments
• Dark Fluxes from Accreting Black Holes and Direct Detections