Inferring physical parameters of compact stars from their f-mode gravitational wave signals

TL;DR

This paper introduces a universal method to determine the mass, radius, and moment of inertia of compact stars from their gravitational wave signals, applicable to both neutron and quark stars.

Contribution

The authors develop a universal framework linking f-mode gravitational wave features to stellar parameters, enabling accurate inference for different types of compact stars.

Findings

Universal functions relate f-mode frequency and damping rate to stellar parameters.

The scheme accurately infers mass, radius, and moment of inertia.

Applicable to both neutron stars and quark stars.

Abstract

We propose here a robust scheme to infer the physical parameters of compact stars from their f-mode gravitational wave signals. We first show that the frequency and the damping rate of f-mode oscillation of compact stars can be expressed in terms of universal functions of stellar mass and moment of inertia. By employing the universality in the f-mode one can then infer accurate values of the mass, the moment of inertia and the radius of a compact star. In addition, we demonstrate that our new scheme works well for both realistic neutron stars and quark stars, and hence provides a unifying way to infer the physical parameters of compact stars.