Hybrid stars within a covariant, nonlocal chiral quark model

DAVID B. BLASCHKE; DANIEL GOMEZ DUMM; ANA G. GRUNFELD; THOMAS KLÄHN; NORBERTO N. SCOCCOLA

PHYS. REV. - C

The American Physical Society

Lugar: Ridge, N. Y., EE. UU; Año: 2007 vol. 75 p. 65804 - 65804

0556-2813

We present a hybrid equation of state (EoS) for dense matter in which a nuclear matter phase is described within the Dirac-Brueckner-Hartree-Fock (DBHF) approach and a two-flavor quark matter phase is modelled according to a recently developed covariant, nonlocal chiral quark model. We show that modern observational constraints for compact star masses (M ~ 2 M_Sun) can be satisfied when a small vector-like four quark interaction is taken into account. The corresponding isospin symmetric EoS is consistent with flow data analyses of heavy ion collisions and points to a deconfinement transition at about 0.55 fm-3.