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Composite strongly interacting dark matter
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It has been suggested that cold dark matter (CDM) has difficulties in explaining tentative evidence for noncuspy halo profiles in small galaxies, and the low velocity dispersions observed in the largest Milky Way satellites ("too big to fail" problem). Strongly self-interacting dark matter has been noted as a robust solution to these problems. The elastic cross sections required are much larger than predicted by generic CDM models, but could naturally be of the right size if dark matter is composite. We explore in a general way the constraints on models where strongly interacting CDM is in the form of dark "atoms" or "molecules," or bound states of a confining gauge interaction ("hadrons"). These constraints include considerations of relic density, direct detection, big bang nucleosynthesis, the cosmic microwave background, and LHC data.
Forward citations
Cited by 6 Pith papers
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Decaying composite dark matter in the 1 to 10 GeV mass range is most strongly constrained by AMS-02 positron data, needing lifetimes above roughly 10^26 seconds.
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Dark baryons made of SU(2)_L multiplet dark quarks are predicted to be dominated by an SU(2)_L singlet state above TeV masses, which strongly suppresses interactions with the Standard Model.
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