Impact of the vector interaction on the phase structure of QCD matter

Abstract

The 2-flavor Polyakov-loop extended model is generalized by taking into account the effective four-quark vector-type interaction with the coupling strengths, which are endowed with a dependence on the Polyakov field $\Phi$. The effective vertex generates entanglement interaction between the Polyakov loop and the chiral condensate. We investigate the influence of an additional quark vector interaction and the entanglement interaction on the location of the critical end-point at the given chemical potential or quark density. It is shown that the finite value of the vector interaction strength $G_{\mathrm{v}}$ improves the model agreement with the lattice data. The influence of the non-zero $G_{\mathrm{v}}$ and entanglement on the thermodynamic observables and the curvature of the crossover boundary in the $T-\mu$ plane is also examined.

9 pages, 12 figures. arXiv admin note: text overlap with arXiv:1006.3648 by other authors

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Cited by in corpus (11)

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• Influence of the inverse magnetic catalysis and the vector interaction in the location of the critical end point
• QCD phase diagram in a magnetized medium from the chiral symmetry perspective: The linear sigma model with quarks and the Nambu--Jona-Lasinio model effective descriptions
• Supporting the search for the CEP location with nonlocal PNJL models constrained by Lattice QCD
• Phase Diagram, Scalar-Pseudoscalar Meson Behavior and Restoration of Symmetries in (2+1) Polyakov-Nambu-Jona-Lasinio Model
• Strange matter and kaon to pion ratio in SU(3) PNJL model
• An effective field theory for warm QCD
• Chiral phase transition and kaon-to-pion ratios in the entanglement SU(3) PNJL model
• Vector interaction bounds in NJL-like models from LQCD estimated curvature of the chiral crossover line
• Vector meson spectral function and dilepton rate in the presence of strong entanglement effect between the chiral and the Polyakov loop dynamics
• The role of the chiral phase transition in modelling the kaon to pion ratio