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arXiv · 2212.09785

Constraining dark matter interactions mediated by a light scalar with white dwarfs

Maura E. Ramirez-Quezada
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Abstract

Observations of white dwarfs in dark matter-rich environments can provide strong limits on the strength of dark matter interactions. Here we apply the recently improved formalism of the dark matter capture rate in white dwarfs to a general model in which dark matter interacts with the white dwarf ion components via a light scalar mediator. We compute the dark matter capture rate in the optically thin limit in a cold white dwarf from the globular cluster Messier. We then estimate the threshold cross-section, which significantly varies as a function of the light scalar mediator mass $m_ϕ$ in the range of $0.05\, m_χ m_χ$. We also show that the bounds obtained from the dark matter capture in a white dwarf from the globular cluster Messier 4 are complementary to direct detection experiments and particularly strong in the sub-GeV regime.

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Maura E. Ramirez-Quezada. 2023-04-06. Constraining dark matter interactions mediated by a light scalar with white dwarfs. https://doi.org/10.1103/physrevd.107.083022

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