Second look to the Polyakov Loop Nambu-Jona-Lasinio model at finite baryonic density

Abstract

We revisit the Polyakov Loop coupled Nambu-Jona-Lasinio model that maintains the Polyakov loop dynamics in the limit of zero temperature. This is of interest for astrophysical applications in the interior of neutron stars. For this purpose we re-examine the form of the potential for the deconfinement order parameter at finite baryonic densities. Since the modification of this potential at any temperature is formally equivalent to assigning a baryonic charge to gluons, we develop a more general formulation of the present model that cures this spurious effect and is normalized to match the asymptotic behaviour of the QCD equation of state given by $\mathcal{O}({\alpha }_s^2)$ and partial $\mathcal{O}({\alpha }_s^3{\ln }^2{\alpha }_s)$ perturbative results.

arXiv comment10 pages, 3 figures. Accepted in Phys. Rev. D

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• Thermodynamical phases in a PNJL model at zero temperature
• PNJL model at zero temperature: three-flavor case
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• Strange stars admixed with dark matter: equiparticle model in a two fluid approach
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