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- W4313410550 abstract "Scattering interactions between dark matter and Standard Model states mediated by pseudoscalars are generically challenging to uncover at direct detection experiments due to rates suppressed by powers of the local dark matter velocity ${v}_{mathrm{DM}}ensuremath{sim}{10}^{ensuremath{-}3}c$. However, they may be observed in the dark matter-induced heating of neutron stars, whose steep gravitational potentials prevent such suppression by accelerating infalling particles to semirelativistic speeds. We investigate this phenomenon in the context of two specific, self-consistent scenarios for pseudoscalars coupled to dark matter, and compare the sensitivity of neutron star heating to bounds from direct searches for the mediators and dark matter. The first ``lighter'' scenario consists of sub-10 GeV mass dark matter mediated by an axionlike particle, while the second ``heavier'' scenario has dark matter above 10 GeV mediated by a dark pseudoscalar that mixes with a pseudoscalar from a two-Higgs doublet (the so-called $2mathrm{HDM}+a$ model). In both frameworks, we show that imminent measurements of neutron stars will be able to test pseudoscalar-mediated dark matter beyond the reach of direct dark matter searches as well as bounds on the mediators from flavor observables, beam dump experiments, and high-energy colliders." @default.
- W4313410550 created "2023-01-06" @default.
- W4313410550 creator A5024948307 @default.
- W4313410550 creator A5057783487 @default.
- W4313410550 creator A5070110363 @default.
- W4313410550 creator A5074566919 @default.
- W4313410550 date "2022-12-19" @default.
- W4313410550 modified "2023-10-18" @default.
- W4313410550 title "Neutron star observations of pseudoscalar-mediated dark matter" @default.
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