Strongly Interacting Dark Matter admixed Neutron Stars

Yannick Dengler; Suchita Kulkarni; Axel Maas; Kevin Radl

doi:10.21468/scipostphyscore.9.2.019

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arXiv · 2503.19691

Strongly Interacting Dark Matter admixed Neutron Stars

Yannick Dengler·Suchita Kulkarni·Axel Maas·Kevin Radl

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Abstract

Dark matter may accumulate in neutron stars given its gravitational interaction and abundance. We investigate the influence of strongly-interacting dark matter, described by a QCD-like one-flavor $G_2$ gauge theory, on neutron stars. This choice allows to test, for the first time, a first-principles-determined non-Abelian dark matter equation of state, which supports composite fermionic dark matter and thus a Fermi-pressure-stabilized dark matter component. The ordinary matter part of the mixed star is described by available model-agnostic equations of state that interpolate between the low-density regime and high-density regime. We find that strongly-interacting dark matter has a similar impact on neutron stars as other model equation of states and confirm that strongly-interacting dark matter can be accommodated by constraints from neutron star observations within our uncertainties.

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Yannick Dengler, Suchita Kulkarni, Axel Maas, Kevin Radl. 2025-03-25. Strongly Interacting Dark Matter admixed Neutron Stars. https://doi.org/10.21468/scipostphyscore.9.2.019

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