Dark Matter's secret liaisons: phenomenology of a dark U(1) sector with bound states

Abstract : Dark matter (DM) charged under a dark U(1) force appears in many extensions of the Standard Model, and has been invoked to explain anomalies in cosmic-ray data, as well as a self-interacting DM candidate. In this paper, we perform a comprehensive phenomenological analysis of such a model, assuming that the DM abundance arises from the thermal freeze-out of the dark interactions. We include, for the first time, bound-state effects both in the DM production and in the indirect detection signals, and quantify their importance for Fermi, AMS, and CMB experiments. We find that DM in the mass range 1 GeV to 100 TeV, annihilating into dark photons of MeV to GeV mass, is in conflict with observations. Instead, DM annihilation into heavier dark photons is viable. We point out that the late decays of multi-GeV dark photons can produce significant entropy and thus dilute the DM density. This can lower considerably the dark coupling needed to obtain the DM abundance, and in turn relax the existing constraints.
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Journal of Cosmology and Astroparticle Physics, Institute of Physics (IOP), 2017, 2017 (05), pp.036. 〈10.1088/1475-7516/2017/05/036〉
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Soumis le : lundi 3 juillet 2017 - 13:27:31
Dernière modification le : jeudi 11 janvier 2018 - 06:25:44

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Marco Cirelli, Paolo Panci, Kalliopi Petraki, Filippo Sala, Marco Taoso. Dark Matter's secret liaisons: phenomenology of a dark U(1) sector with bound states. Journal of Cosmology and Astroparticle Physics, Institute of Physics (IOP), 2017, 2017 (05), pp.036. 〈10.1088/1475-7516/2017/05/036〉. 〈hal-01552998〉

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