Science and Technology Production
Proceedings of Science - Nonlocal PNJL models and heavy hybrid stars
Congress
Authorship:
David Blaschke ; David E. Alvarez Castillo ; CONTRERA, GUSTAVO ANIBAL GABRIEL ; Rafal Lastowiecki ; Sanjin BenicDate:
2013Publishing House and Editing Place:
SISSAISSN:
1824-8039Summary *
Nonlocal PNJL models allow for a detailed description of chiral quark dynamics with running quark masses and wave function renormalization in accordance with lattice QCD (LQCD) in vacuum. Their generalization to finite temperature T and chemical potential mu allows to reproduce the mu-dependence of the pseudocritical temperature from LQCD when a nonvanishing vector meson coupling is adjusted. This restricts the region for the critical endpoint in the QCD phase diagram and stiffens the quark matter equation of state (EoS). It is demonstrated that the construction of a hybrid EoS for compact star applications within a two-phase approach employing the nonlocal PNJL EoS and an advanced hadronic EoS leads to the masquerade problem. A density dependence of the vector meson coupling is suggested as a possible solution which can be adjusted in a suitable way to describe hybrid stars with a maximum mass in excess of 2 M_sun with a possible early onset of quark deconfinement even in the cores of typical (M ~ 1.4 M_sun) neutron stars. Information provided by the agent in SIGEVAKey Words
PNJL MODELCHIRAL EFFECTIVE MODELSHYBRID STARS