Effects of Hadron-Quark Phase Transitions in Hybrid Stars within the NJL Model

IGNACIO F. RANEA-SANDOVAL; DANIELA CURIN; OCTAVIO M. GILERA; MILVA G. ORSARIA; MAURO MARIANI; GERMÁN MALFATTI; GUSTAVO A. CONTRERA

Symmetry

MDPI

Lugar: Basel; Año: 2019 vol. 11 p. 1 - 18

2073-8994

We study local and non-local Polyakov Nambu-Jona-Lasinio models and analyze their respective phase transition diagram. We construct hybrid stars using the zero temperature limit of the local and non-local versions of Nambu-Jona-Lasinio model for quark matter and the modern GM1(L) parametrization of the non-linear relativistic mean field model for hadronic matter. We compare our models with data from PSR J1614-2230 and PSR J0343+0432 and also from GW170817 and itselectromagnetic counterpart GRB170817A and AT2017gfo. We study observational signatures of the appearance of a mixed phase as a result of modeling a phase transition that mimics the Gibbs formalism and compares the results with the sharp first-order phase transition obtained using the Maxwell construction. We also study in detail the g-mode associated with discontinuities in the equation of state and calculate non-radial oscillation modes using relativistic Cowling approximation.