Nuclear matter, nuclei, and neutron stars in hadron and quark-hadron models

TL;DR

This paper develops a unified hadron-quark model to explore the phase structure, equation of state, and astrophysical properties of neutron and hybrid stars, including cooling and the impact of Delta resonances.

Contribution

It introduces a comprehensive model linking hadrons and quarks, analyzing phase transitions, star structure, and cooling, with novel insights into the effects of Delta resonances on star properties.

Findings

Determined neutron and hybrid star masses and radii from the equation of state.

Established a relation between star mass, rotation, and cooling behavior.

Explored the impact of Delta resonances on star matter and radii.

Abstract

We develop a unified model of hadrons and quarks. Within this approach we investigate the phase structure of the model as function of temperature and chemical potential. Computing the equation of state of cold matter we determine neutron and hybrid star masses and radii. In an extension of the investigation we consider the cooling behavior of the compact stars and derive a general relation between the star's mass and rotation and its cooling behavior. Finally we study the effect of Delta resonances for star matter, especially with respect to possible solutions of stars with small radii.