How does dark matter affect compact star properties and high density constraints of strongly interacting matter

Abstract

We study the impact of asymmetric bosonic dark matter on neutron star properties, including possible changes of tidal deformability, maximum mass, radius, and matter distribution inside the star. The conditions at which dark matter particles tend to condensate in the star's core or create an extended halo are presented. We show that dark matter condensed in a core leads to a decrease of the total gravitational mass and tidal deformability compared to a pure baryonic star, which we will perceive as an effective softening of the equation of state. On the other hand, the presence of a dark matter halo increases those observable quantities. Thus, observational data on compact stars could be affected by accumulated dark matter and, consequently, constraints we put on strongly interacting matter at high densities. To confirm the presence of dark matter in the compact star's interior, and to break the degeneracy between the effect of accumulated dark matter and strongly interacting matter properties at high densities, several astrophysical and GW tests are proposed.

8 pages, 3 figures, Proceeding of the 15th Quark Confinement and the Hadron Spectrum Conference

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• Fermion Proca Stars: Vector Dark Matter Admixed Neutron Stars
• The impact of dark matter on tidal signatures in neutron star mergers with Einstein Telescope
• Exploring Fermionic Dark Matter Admixed Neutron Stars in the Light of Astrophysical Observations
• Revealing Dark Matter's Role in Neutron Stars Anisotropy: A Bayesian Approach Using Multi-messenger Observations