The quark susceptibility in a generalized dynamical quasiparticle model

2015/12/21 by Hamza Berrehrah, Wolfgang Cassing, Elena Bratkovskaya +1 · 2 citations
Physics and Astronomy · #hep-ph #nucl-th

paper · pdf · doi:10.1103/physrevc.93.044914

published as Phys. Rev. C 93, 044914 (2016) · 12 pages, 11 figures

arxiv created 2015/12/21 · arxiv updated 2016/05/04

Abstract

The quark susceptibility χ_q at zero and finite quark chemical potential provides a critical benchmark to determine the quark-gluon-plasma (QGP) degrees of freedom in relation to the results from lattice QCD (lQCD) in addition to the equation of state and transport coefficients. Here we extend the familiar dynamical-quasiparticle model (DQPM) to partonic propagators that explicitly depend on the three-momentum with respect to the partonic medium at rest in order to match perturbative QCD (pQCD) at high momenta. Within the extended dynamical-quasi-particle model (DQPM^*) we reproduce simultaneously the lQCD results for the quark number density and susceptibility and the QGP pressure at zero and finite (but small) chemical potential μ_q. The shear viscosity η and the electric conductivity σ_e from the extended quasiparticle model (DQPM^*) also turn out in close agreement with lattice results for μ_q =0. The DQPM^*, furthermore, allows to evaluate the momentum p, temperature T and chemical potential μ_q dependencies of the partonic degrees of freedom also for larger μ_q which are mandatory for transport studies of heavy-ion collisions in the regime 5 GeV < √s_NN < 10 GeV.

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• A dynamical quasiparticle approach for the Quark-Gluon-Plasma bulk and transport properties
• Transport coefficients of strongly interacting quark-gluon plasma including elastic and inelastic scattering within the dynamical quasiparticle model