EFFECTS OF THE EXISTENCE OF A MIXED PHASE IN HYBRID NEUTRON STARS

In this work we investigate the structure of hybrid stars composed of a hadron phase described by the nonlinear Walecka model and a quark phase described by the Nambu–Jona–Lasinio model. Two constructions are studied: the first one considers the existence of a mixed phase at intermediate stellar densities, between the density where matter is composed of hadrons and the density where matter is composed of quarks. The second construction implies the inexistence of this mixed phase. In this case, the hadron and the quark phases are in direct contact.