Meson fluctuations and thermodynamics of the Polyakov-loop-extended quark-meson model

  title={Meson fluctuations and thermodynamics of the Polyakov-loop-extended quark-meson model},
  author={V. Skokov and B. Stoki{\'c} and B. Friman and K. Redlich},
  journal={Physical Review C},
Thermodynamics of the Polyakov-loop-extended two-flavor chiral quark-meson model (PQM) is explored. The analysis of the PQM model is based on the functional renormalization group method. An appropriate truncation of the effective action with quarks coupled to background gluonic fields is introduced. Within this scheme, we derive the renormalization group flow equation for the scale-dependent thermodynamic potential at finite temperature and density in the presence of a symmetry breaking… Expand

Figures from this paper

Quark number fluctuations in the Polyakov loop-extended quark-meson model at finite baryon density
The thermodynamics and phase structure of the Polyakov loop-extended two-flavor chiral quark-meson (PQM) model are explored beyond the mean-field approximation. The analysis of the PQM model is basedExpand
Non-perturbative dynamics and charge fluctuations in effective chiral models
Abstract We discuss the properties of fluctuations of the electric charge in the vicinity of the chiral crossover transition within effective chiral models at finite temperature and vanishing netExpand
QCD thermodynamics of effective models with an improved Polyakov-loop potential
We analyse the role of the quark backreaction on the gauge-field dynamics and its impact on the Polyakov-loop potential. Based on our analysis we construct an improved Polyakov-loop potential thatExpand
Thermodynamics of 2+1 Flavor Polyakov-Loop Quark-Meson Model under External Magnetic Field
We study the thermodynamics of the QCD system under external magnetic field via the 2+1 flavor Polyakov-loop quark-meson model. To incorporate quantum and thermal fluctuations, the functionalExpand
Charge fluctuations in chiral models and the QCD phase transition
We consider the Polyakov loop-extended two-flavor chiral quark–meson model and discuss critical phenomena related to the spontaneous breaking of the chiral symmetry. The model is explored beyond theExpand
Momentum scale dependence of the net quark number fluctuations near chiral crossover
We investigate properties of the net baryon number fluctuations near chiral crossover in a hot and dense medium of strongly interacting quarks. The chirally invariant quark-antiquark interactions areExpand
Mesonic dynamics and the QCD phase transition
We study the nontrivial dispersion relation of mesons resulting from the splitting of the transversal and longitudinal mesonic wave function renormalizations, and its influences on the QCD phaseExpand
The phase structure of the Polyakov–quark–meson model beyond mean field
The Polyakov-extended quark–meson model (PQM) is investigated beyond mean-field. This represents an important step towards a fully dynamical QCD computation. Both the quantum fluctuations to theExpand
Net-baryon number fluctuations in the Hybrid Quark-Meson-Nucleon model at finite density
We study the mean-field thermodynamics and the characteristics of the net-baryon number fluctuations at the phase boundaries for the chiral and deconfinement transitions in the HybridExpand
Quark-meson-diquark model for two-color QCD
We introduce a two-flavor quark-meson-diquark model for two-color QCD and its extensions to include gauge-field dynamics as described by the Polyakov loop. Grand potential and phase structure areExpand


Phase structure of the Polyakov-quark-meson model
The relation between the deconfinement and chiral phase transition is explored in the framework of a Polyakov-loop-extended two-flavor quark-meson (PQM) model. In this model the Polyakov loopExpand
The quark-meson model and the phase diagram of two-flavour QCD
Abstract We study the qualitative features of the QCD phase diagram in the context of the linear quark–meson model with two flavours, using the exact renormalization group. We identify theExpand
Hadronic fluctuations at the QCD phase transition
We discuss the properties of hadronic fluctuations, i.e., fluctuations of net quark and isospin numbers as well as electric charge, in the vicinity of the QCD transition in isospin-symmetric matterExpand
Phases of QCD: lattice thermodynamics and a field theoretical model
We investigate three-color QCD thermodynamics at finite quark chemical potential. Lattice QCD results are compared with a generalized Nambu Jona-Lasinio model in which quarks couple simultaneously toExpand
Polyakov loop in chiral quark models at finite temperature
We describe how the inclusion of the gluonic Polyakov loop incorporates large gauge invariance and drastically modifies finite temperature calculations in chiral quark models after color neutralExpand
Susceptibilities and the Phase Structure of a Chiral Model with Polyakov Loops
In an extension of the Nambu--Jona-Lasinio model where the quarks interact with the temporal gluon field, represented by the Polyakov loop, we explore the relation between the deconfinement andExpand
The functional renormalization group and O(4) scaling
The critical behavior of the chiral quark-meson model is studied within the Functional Renormalization Group (FRG). We derive the flow equation for the scale-dependent thermodynamic potential atExpand
Kurtosis and compressibility near the chiral phase transition
Abstract The properties of net quark number fluctuations in the vicinity of the QCD chiral phase transition are discussed in terms of an effective chiral model in the mean-field approximation. WeExpand
The Phase Diagram of the Quark-Meson Model
Abstract Within the proper-time renormalization group approach, the chiral phase diagram of a two-flavor quark–meson model is studied. In the chiral limit, the location of the tricritical point whichExpand
The QCD equation of state for two flavours at non-zero chemical potential
We present results of a simulation of 2 flavour QCD on a 16 3 × 4 lattice using p4-improved staggered fermions with bare quark mass m / T = 0.4 . Derivatives of the thermodynamic grand canonicalExpand