期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 5, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2017/05/036
关键词
dark matter theory; absorption and radiation processes; dark matter experiments; cosmology of theories beyond the SM
资金
- European Research Council (ERC) under the EU Seventh Framework Programme (FP7)/ERC Starting Grant [278234]
- French state funds [ANR-11-IDEX-0004-02, ANR-10-LABX-63]
- ANR (Agence Nationale de la Recherche)
- NWO (The Netherlands Organisation for Scientific Research), VIDI grant, 'SELF INTERACTING ASYMMETRIC DARK MATTER' project
- ERC Advanced Grant [267117]
- Centro de Excelencia Severo Ochoa Programme [SEV-2012-0249]
- MINECO through a Severo Ochoa fellowship [SEV-2012-0249]
- Consolider MultiDark [CSD2009-00064]
- [FPA2015-65929-P]
- European Research Council (ERC) [267117] Funding Source: European Research Council (ERC)
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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