Compact Star Twins with a Dark Matter Core

TL;DR

This paper models compact stars with dark matter cores, demonstrating how a strong phase transition can produce mass twin stars consistent with current observational constraints.

Contribution

It introduces a novel model of compact stars featuring a dark matter core and a strong phase transition, resulting in mass twins without a quark matter phase transition.

Findings

Mass twins are produced via a strong first-order phase transition.

The model aligns with current astrophysical measurements.

Dark matter cores significantly influence star structure.

Abstract

We present a model of compact stars with a dark matter core. The hadronic equation of state is based on the parity doublet model and does not present a phase transition to quark matter. Instead, a strong first-order phase transition to dark matter described by a constant speed of sound model leads to the scenario of compact star mass twins. Compact star structural properties which obey state-of-the-art measurements and constraints are presented.