Quark Hadron Phase Transition and Hybrid Stars

TL;DR

This paper explores the phase transition between hadronic and quark matter in hybrid stars, using specific models to calculate equations of state and analyzing how these transitions affect star properties.

Contribution

It introduces a detailed analysis of phase transitions in hybrid stars using nonlinear Walecka and CCD models, highlighting the conditions for transition and resulting star characteristics.

Findings

Phase transition occurs in a narrow parameter range.

Transition can be strong or weak first order.

Hybrid star properties resemble pure neutron stars.

Abstract

We investigate the properties of hybrid stars consisting of quark matter in the core and hadron matter in outer region. The hadronic and quark matter equations of state are calculated by using nonlinear Walecka model and chiral colour dielectric (CCD) model respectively. We find that the phase transition from hadron to quark matter is possible in a narrow range of the parameters of nonlinear Walecka and CCD models. The transition is strong or weak first order depending on the parameters used. The EOS thus obtained, is used to study the properties of hybrid stars. We find that the calculated hybrid star properties are similar to those of pure neutron stars.