Bounds on self-interacting fermion dark matter from observations of old neutron stars
arXiv:1310.3509 · doi:10.1103/PhysRevD.89.015010
Abstract
The existence of old neutron stars deeply constrains self-interacting fermion dark matter, which can form star-killing black holes. We quantify this constraint on dark matter-nucleon scattering, considering collapse scenarios that broaden bounds over intermediate masses. We then find the self- and co-annihilation rates necessary to lift these dark matter-nucleon scattering bounds. For Yukawa-coupled dark matter that fits dwarf galaxy halo profiles with a coupling , a scalar mediator mass MeV, and DM mass GeV, we show that fermion dark matter is unconstrained if it self-annihilates at a rate greater than or co-annihilates with baryons at a rate greater than .
arXiv comment35 pages, 8 figures, corrected typos
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