Asymmetric Dark Matter Stars

TL;DR

This paper explores the formation and properties of stable compact objects made of asymmetric dark matter with self-interactions, analyzing their structure and stability through the TOV equation.

Contribution

It introduces a detailed analysis of dark matter stars, including mass-radius relations and stability criteria, considering Yukawa self-interactions and relativistic effects.

Findings

Dark matter stars can have significant relativistic effects.

Self-interactions influence the mass and size of dark stars.

Chandrasekhar mass limits are derived for these objects.

Abstract

We study the possibility of asymmetric dark matter with self-interactions forming compact stable objects. We solve the Tolman-Oppenheimer-Volkoff equation and find the mass-radius relation of such "dark stars", their density profile and their Chandrasekhar mass limit. We consider fermionic asymmetric dark matter with Yukawa-type self-interactions appropriate for solving the well known problems of the collisionless dark matter paradigm. We find that in several cases the relativistic effects are significant.