Quark stars admixed with dark matter

TL;DR

This paper investigates the structure and stability of quark stars mixed with dark matter, analyzing how dark matter interactions influence their mass-radius relations and maximum stable mass.

Contribution

It introduces a model of quark stars with fermionic dark matter, including dark matter self-interactions, and explores their stability and mass-radius characteristics.

Findings

Maximum stable mass decreases linearly with dark matter fraction

Dark matter interactions affect star stability and structure

Mass-radius relations depend on dark matter properties

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 inter-fermionic 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 increasing dark matter fraction.