Implications of Mirror Dark Matter on Neutron Stars

TL;DR

This paper explores how asymmetric dark matter could influence neutron star structure, presenting a model with mixed baryonic and dark matter components, and analyzing its physical properties and potential astrophysical implications.

Contribution

It introduces a novel mixed neutron star model incorporating asymmetric dark matter and derives the relativistic structure equations for such stars.

Findings

Total mass of 3.74 solar masses for the mixed star

Star radius of 31.9 km and neutron-sphere radius of 11.1 km

Redshift values of 0.72 and 0.25 from the neutron-sphere and surface

Abstract

We study the implications of asymmetric dark matter on neutron stars. we construct a "mixed neutron star" model composed of ordinary baryons and of asymmetric dark matter baryons. We derive the general relativistic structure equations for each specie, the equation for the mass within a given radius, and the redshift as function of radius. We present one specific numerical model as an illustrative example. In this example, the mass of the dark neutron equals half that of the ordinary neutron. The main results are: a total mass of $3.74 M_{\odot}$, a total mass within the neutron-sphere equaling $1.56 M_{\odot}$, the neutrons mass is $1.34 M_{\odot}$, the star radius is 31.9 km, the neutron-sphere radius is 11.1 km, and the redshifts from the neutron-sphere and from the star surface are 0.72, 0.25, respectively. We comment briefly on possible astrophysical implications.