Dark matter admixed neutron star as a possible compact component in the GW190814 merger event

TL;DR

This paper explores the possibility that the secondary object in GW190814 was a dark matter admixed neutron star, analyzing how dark matter influences its mass, radius, and deformability to match observational data.

Contribution

It introduces a model incorporating dark matter into neutron stars and demonstrates its consistency with GW190814 data, highlighting a new potential nature of compact objects.

Findings

Dark matter reduces neutron star mass, radius, and deformability with increasing percentage.

Predicted properties align with GW190814 observational data for sufficiently stiff nuclear equations.

Dark matter admixed neutron stars could explain the secondary component in GW190814.

Abstract

We put constraints on the secondary component of GW190814 by analyzing the observational data of the event. The relativistic mean-field models are used to calculate the mass-radius profile and tidal deformability of the compact object, considering it as a massive neutron star with the presence of dark matter particles inside it. With the increase of dark matter percentage, the maximum mass, radius, and tidal deformability of the neutron star decreases. We observe that the predicted properties are well consistent with GW190814 observational data, suggesting the possibility of a dark matter admixed neutron star if the underlying nuclear equation of state is sufficiently stiff.