Predictions on observing hot holographic quark star with gravitational waves

TL;DR

This paper models hot quark stars using holographic QCD, exploring their properties and potential gravitational wave signatures, suggesting they could mimic black holes and be observable through gravitational wave signals.

Contribution

It introduces a holographic QCD-based equation of state for hot quark matter and constructs a new hybrid star model with a thin hadron shell.

Findings

Stable stars with masses 5-30 solar masses

Maximum compactness around 0.2

Distinct gravitational wave signatures from black holes

Abstract

We extract the equation of state of hot quark matter from a holographic 2+1 flavor QCD model, which could form the core of a stable compact star. By adding a thin hadron shell, a new type of hybrid star is constructed. With the temperature serving as a parameter, the EoS varies and we obtain stable stars with mass ranging from about 5 to 30 solar masses, and the maximum compactness around 0.2. The I-Love-Q-C relations are further discussed, and compared with the neutron star cases. These compact stars are candidates for black hole mimickers, which could be observed by gravitational waves and distinguished by properties like nonzero tidal Love number and electromagnetic signals.