Exploring the Structural Properties of Anisotropic Dark Matter-Admixed Quark Stars

TL;DR

This study models anisotropic dark matter-admixed quark stars using two-fluid equations, revealing how dark matter influences their structure, compactness, and mass, with implications for astrophysical observations.

Contribution

It introduces a two-fluid model combining quark matter and dark matter with anisotropy, analyzing their combined effects on star properties using specific equations of state.

Findings

Dark matter increases star compactness but reduces mass.

Dark matter presence affects the mass-radius relationship.

Anisotropy impacts the stability and structure of the stars.

Abstract

We investigate anisotropic compact stars comprising two non-interacting fluids: quark matter and condensed dark matter. Using the MIT Bag model equation of state for quark matter and Bose-Einstein Condensate equation of state for dark matter, we numerically compute interior solutions for those two-fluid component spherical configurations. Varying the initial central density ratio of dark matter to quark matter, we examine how different proportions of these components influence the mass-radius profile, the factor of compactness as well as the quark mass fraction. Recent studies suggest that quark matter may exist in the cores of massive neutron stars, significantly affecting their structure and stability. We calculate the factor of compactness for both negative and positive anisotropy cases explored in this article. Our findings demonstrate that dark matter-admixed quark stars are more compact yet less massive compared to pure quark matter stars, aligning with recent theoretical predictions and gravitational wave observations.