Quark stars admixed with dark matter

Abstract

Compact stars consisting of massless quark matter and fermionic dark matter are studied by solving the Tolman-Oppenheimer-Volkoff equations for two fluids separately. Dark matter is further investigated by incorporating interfermionic interactions among the dark matter particles. The properties of stars made of quark matter particles and self-interacting and free dark matter particles are explored by obtaining their mass-radius relations. The regions of stability for such a compact star are determined, and it is demonstrated that the maximum stable total mass of such a star decreases approximately linearly with an increasing dark matter fraction.