Hot Holographic 2-flavor Quark Star

TL;DR

This paper uses a holographic model fixed by lattice QCD to derive equations of state for hot quark stars, exploring their properties, stability, and potential as black hole mimickers.

Contribution

It introduces a holographic approach to model hot quark star cores and analyzes their structural and thermodynamic properties, including mass, compactness, and I--Love--Q--C relations.

Findings

Quark stars can have masses from 2 to 17 solar masses.

Maximum compactness around 0.22, allowing black hole mimicking.

Consistent I--Love--Q--C relations with neutron stars.

Abstract

Applying the holographic 2-flavor Einstein--Maxwell-dilaton model, the parameters of which are fixed by lattice QCD, we extract the equations of state for hot quark--gluon plasma around the critical point at T=182 MeV, and have corresponding quark star cores constructed. By further adding hadron shells, the mass range of the whole stars spans from 2 to 17 solar masses, with the maximum compactness around 0.22. This result allows them to be black hole mimickers and candidates for gap events. The I--Love--Q--C relations are also analyzed, which show consistency with the neutron star cases when the discontinuity at the quark--hadron interface is not large. Furthermore, we illustrate the full parameter maps of the energy density and pressure as functions of the temperature and chemical potential and discuss the constant thermal conductivity case supposing a heat source inside.