Rotational Behaviour of Exotic Compact Objects

TL;DR

This paper models exotic dark matter compact objects with self-interacting fermions, analyzing their structural, tidal, and rotational properties to understand their gravitational wave signatures and distinguish them from neutron stars.

Contribution

It introduces a novel model of dark matter compact objects with self-interacting fermions and compares their properties to neutron stars using the Hartle-Thorne formalism.

Findings

Dark matter objects exhibit distinct tidal properties from neutron stars.

Rotational characteristics influence gravitational wave signals differently.

Dark objects can mimic or be distinguished from neutron stars in gravitational wave data.

Abstract

We construct exotic compact objects composed entirely of self-interacting asymmetric fermionic dark matter governed by a repulsive Yukawa potential with massive dark interaction boson. By considering the structural, tidal, and rotational properties of solar mass self-gravitating dark matter systems, and contrasting them against purely baryonic neutron stars, described by the well understood SLy4 equation of state, we hope to shed some light on the place of dark compact systems in the context of gravitational wave astronomy, specifically due to the difficulty parsing mass and radius data from events with no electromagnetic counterpart. Here we consider systems composed of 1 GeV and 10 GeV dark matter. Relevant compact objects are then analysed and simulated as both static bodies, and rotating systems governed by the Hartle-Thorne formalism to second order. Here within we highlight the differences in key tidal and rotational properties encoded in gravitational wave signals, and analyse how dark objects may mimic or distinguish themselves to current and future gravitational wave observatories.