Influence of Dark Matter on the Magnetized Neutron Star

TL;DR

This paper investigates how dark matter influences the properties of magnetized neutron stars, revealing that dark matter and magnetic fields significantly alter their macroscopic characteristics, especially in the core region.

Contribution

It provides the first detailed analysis of dark matter effects on magnetized neutron stars using a relativistic mean-field model with density-dependent magnetic fields.

Findings

Dark matter softens the equation of state of neutron stars.

Magnetic field orientation affects the star's properties differently.

Core properties are mainly influenced by dark matter and magnetic fields.

Abstract

Over the past two decades, significant strides have been made in the study of Dark Matter (DM) admixed neutron stars and their associated properties. However, an intriguing facet regarding the effect of DM on magnetized neutron stars still remains unexplored. This study is carried out to analyze the properties of DM admixed magnetized neutron stars. The equation of state for the DM admixed neutron star is calculated using the relativistic mean-field model with the inclusion of a density-dependent magnetic field. Several macroscopic properties, such as mass, radius, particle fractions, tidal deformability, and the $f$-mode frequency, are calculated with different magnetic field strengths and DM configurations. The equation of state is softer with the presence of DM as well as for the parallel components of the magnetic field and vice-versa for the perpendicular one. Other macroscopic properties, such as mass, radius, tidal deformability, etc., are also affected by both DM and magnetic fields. The change in the magnitude of different neutron star observables is proportional to the amount of DM percentage and the strength of the magnetic field. We observe that the change is seen mainly in the core part of the star without affecting the crustal properties.