Strange magnetars admixed with fermionic dark matter

TL;DR

This paper investigates how fermionic dark matter and strong magnetic fields influence the structure and observable properties of strange stars, revealing significant effects on mass, radius, and tidal deformability.

Contribution

It introduces a detailed two-fluid model for strange stars with dark matter and magnetic fields, analyzing their combined impact on stellar properties.

Findings

Magnetic fields decrease the star's total mass but slow the mass reduction caused by dark matter.

Tidal deformability varies significantly, up to 90%, with magnetic field strength and dark matter density.

Dark matter and magnetic fields notably affect the star's observable characteristics.

Abstract

We discuss strange stars admixed with fermionic dark matter in the presence of a strong magnetic field using the two-fluid Tolman-Oppenheimer-Volkov equations. We describe strange quark matter using the MIT bag model and consider magnetic fields in the range $\sim 10^{17}-10^{18}$ G. For the fermionic dark matter, we consider the cases of free particles and strongly self-interacting particles, with dark fermion masses $m=5, 100, 500$ GeV. We discuss the effects of dark matter and a strong magnetic field on the masses and radii of the stars, as well as on its tidal deformability. Even though strong magnetic fields contribute to decreasing the total mass of the star, they attenuate the rate of decrease in the maximum mass brought about by increasing the dark matter fraction in the admixed system. The most intensely affected observable, however, is the tidal deformability, with variations on the range of $70\%-90\%$ for reasonable values of the magnetic field or dark matter central energy density.