EQUATION OF STATE FOR HYBRID COMPACT STARS WITH A NONLOCAL CHIRAL QUARK MODEL

Abstract

We study the thermodynamics of two flavor color superconducting (2SC) quark matter within a nonlocal chiral quark model, using both instantaneous and covariant nonlocal interactions. For applications to compact stars, we impose conditions of electric and color charge neutrality as well as β equilibrium and construct a phase transition to the hadronic matter phase described within the Dirac–Brueckner–Hartree–Fock (DBHF) approach. We obtain mass-radius relations for hybrid star configurations which fulfill modern observational constraints, including compact star masses above 2M⊙.