Simultaneous description of high density QCD matter in heavy ion collisions and neutron star observations

TL;DR

This paper presents a unified approach to modeling high-density QCD matter that connects neutron star observations with heavy ion collision data, providing a consistent equation of state applicable across a wide density range.

Contribution

It introduces a combined constraint on the QCD equation of state using the Chiral Mean Field Model, applicable to both neutron stars and heavy ion collisions, unlike previous models.

Findings

The model successfully describes neutron star properties and heavy ion collision observables.

It provides a continuous equation of state over a large density range.

Results are consistent with experimental data from HADES.

Abstract

A combined constraint on the QCD equation of state, at high densities, from connecting neutron star observations to data from heavy ion reactions is presented. We use the Chiral Mean Field Model which can describe neutron star and iso-spin symmetric matter and allows the consistent calculation of the density and momentum dependent potentials of baryons which are then implemented in the UrQMD transport model. In contrast to previous studies, the same equation of state constrained from neutron star properties is also able to describe experimental observables in heavy ion reactions at the HADES experiment. Unlike many other approaches our results are not constraint to densities up to nuclear saturation or perturbative results which allows a continuous description of the equation of state over a large range in baryon density.