Hadron-Quark phase transitions in Neutron Stars inner cores

GUSTAVO A. CONTRERA

San Martín, Provincia de Buenos Aires

Workshop; Workshop PHENOEXP 2018; 2018

International Center for Advanced Studies (ICAS) - UNSAM

The discovery of high-mass Millisecond Pulsars such as J1946+3417 (1.832±0.028M), J16142230 (1.928±0.017M) and J0348+0432 (2.01±0.04M) allows the possible existence of deconfined quarks in the Neutron Stars´ inner core. In order to represent the matter under extremely high-density conditions, we obtain a hadron-quark hybrid equation of state by considering the nonlinear relativistic mean-field approximation for the hadronic matter phase, and the three-flavor non-local Nambu−Jona-Lasinio (NJL) model, with repulsive vector interactions, for the quark matter. The transition from hadronic to quark matter (mixed-phase) is constructed by considering a soft phase transition and imposing global electric charge neutrality condition (Gibbs construction). Depending on the strength of quark vector repulsion, we find that an extended region made of a mixed phase of quarks and hadrons may exist in high-mass Neutron Stars with masses up to 2.1−2.4M. Our study also indicates that Neutron Stars with masses of around 1.4M would not contain deconfined quark matter. Recent developments and some preliminary results at finite temperature to study the stability of Proto-Neutron Stars will also be presented.