Impact of dark matter on strange quark stars described by different quark models

TL;DR

This study explores how dark matter influences the structure and observable properties of strange quark stars using two different quark models and treating dark matter as a self-interacting fermionic component.

Contribution

It introduces a two-fluid model to analyze dark matter's effects on strange quark stars, comparing quasiparticle and MIT bag models for the first time.

Findings

Dark matter affects star properties independently of the quark matter EOS.

Results align with observational data on star mass, radius, and deformability.

Dark matter's impact pattern is consistent across different quark models.

Abstract

Dark matter is hypothesized to interact with ordinary matter solely through gravity and may be present in compact objects such as strange quark stars. We treat strange quark stars admixed with dark matter as two-fluid systems to investigate the potential effects of dark matter on strange quark stars. Quark matter is described by the quasiparticle model and the extended MIT bag model for comparison. Dark matter is treated as asymmetric, self-interacting, and composed of massive fermionic particles. The two-fluid Tolman-Oppenheimer-Volkoff (TOV) equations are employed to solve for specific stellar properties. Our analysis yields relations between central energy density and mass, radius and mass, as well as tidal deformability and mass. The calculated curves generally align with observational data. In particular, we find that the pattern in which fermionic asymmetric dark matter affects the properties of strange quark stars may not be influenced by the equation of state (EOS) of strange quark matter.