Hybrid neutron stars based on a modified PNJL model

Details Hybrid neutron stars based on a modified PNJL model Hybrid neutron stars based on a modified PNJL model

2010-09-07

arxiv.org/abs/1009.1181v1

Prog.Theor.Phys.Suppl.186:81-86,2010

Physics

Nuclear Physics

Nuclear Theory

6 pages, 2 figures

Scientific paper

10.1143/PTPS.186.81

We discuss a three-flavor Nambu--Jona-Lasinio (NJL) type quantum field theoretical approach to the quark matter equation of state (EoS) with scalar diquark condensate, isoscalar vector mean field and Kobayashi-Maskawa-'t Hooft (KMT) determinant interaction. While often the diquark and vector meson couplings are considered as free parameters, we will fix them here to their values according to the Fierz transformation of a one-gluon exchange interaction. In order to estimate the effect of a possible change in the vacuum pressure of the gluon sector at finite baryon density we exploit a recent modification of the Polyakov-loop NJL (mPNJL) model which introduces a parametric density dependence of the Polyakov-loop potential also at T=0, thus being relevant for compact star physics. We use a Dirac-Brueckner-Hartree-Fock (DBHF) EoS for the hadronic matter phase and discuss results for mass-radius relationships following from a solution of the TOV equations for such a hybrid EoS in the context of observational constraints from selected objects.

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