Shear and bulk viscosities of strongly-interacting 'infinite' parton-hadron matter within the parton-hadron-string transport approach

Abstract

We study the shear and bulk viscosities of partonic and hadronic matter as functions of temperature T within the parton-hadron-string dynamics (PHSD) off-shell transport approach. Dynamical hadronic and partonic systems in equilibrium are studied by the PHSD simulations in a finite box with periodic boundary conditions. The ratio of the shear viscosity to entropy density η(T)/s(T) from PHSD shows a minimum (with a value of about 0.1) close to the critical temperature T_c, while it approaches the perturbative QCD limit at higher temperatures in line with lattice QCD (lQCD) results. For T<T_c, i.e., in the hadronic phase, the ratio η/s rises fast with decreasing temperature due to a strong decrease of the entropy density $s$ in the hadronic phase at decreasing T. Within statistics, we obtain practically the same results in the Kubo formalism and in the relaxation time approximation. The bulk viscosity ζ(T)---evaluated in the relaxation time approach---is found to strongly depend on the effects of mean fields (or potentials) in the partonic phase. We find a significant rise of the ratio ζ(T)/s(T) in the vicinity of the critical temperature T_c, when consistently including the scalar mean-field from PHSD, which is also in agreement with that from lQCD calculations. Furthermore, we present the results for the ratio (η+ 3ζ/4)/s, which is found to depend nontrivially on temperature and to generally agree with the lQCD calculations as well. Within the PHSD calculations, the strong maximum of ζ(T)/η(T) close to T_c has to be attributed to mean-field (or potential) effects that in PHSD are encoded in the temperature dependence of the quasiparticle masses, which is related to the infrared enhancement of the resummed (effective) coupling g(T).

9 pages, 7 figures

References in corpus (24)

• Viscosity in Strongly Interacting Quantum Field Theories from Black Hole Physics
• Viscosity Information from Relativistic Nuclear Collisions: How Perfect is the Fluid Observed at RHIC?
• The QCD transition temperature: results with physical masses in the continuum limit
• On the Strongly-Interacting Low-Viscosity Matter Created in Relativistic Nuclear Collisions
• A calculation of the bulk viscosity in SU(3) gluodynamics
• Bulk viscosity of gauge theory plasma at strong coupling
• Parton transport and hadronization from the dynamical quasiparticle point of view
• Quasi-Particle Theory of Shear and Bulk Viscosities of Hadronic Matter
• Bulk viscosity of QCD matter near the critical temperature
• From Kadanoff-Baym dynamics to off-shell parton transport
• Shear Viscosity of a strongly interacting system: Green-Kubo vs. Chapman-Enskog and Relaxation Time Approximation
• Spectral sum rules for the quark-gluon plasma
• Bulk viscosity in quasi particle models
• Dynamical quasiparticles properties and effective interactions in the sQGP
• Origins of Bulk Viscosity at RHIC
• QCD thermodynamics and confinement from a dynamical quasiparticle point of view
• Instability of Boost-invariant hydrodynamics with a QCD inspired bulk viscosity
• Shear Viscosity to Entropy Density Ratio of QCD below the Deconfinement Temperature
• Viscosity coefficients for hadron and quark-gluon phases
• The Bulk Viscosity of a Pion Gas
• Shear Viscosity of a Hot Pion Gas
• Dynamical equilibration of strongly interacting "infinite" parton matter within the parton-hadron-string dynamics transport approach
• Shear Viscosity in a Perturbative Quark-Gluon-Plasma
• Collective properties of nucleus-nucleus collisions from AGS to LHC energies

Cited by in corpus (58)

• Event-by-event fluctuations in perturbative QCD + saturation + hydro model: pinning down QCD matter shear viscosity in ultrarelativistic heavy-ion collisions
• Transport Coefficients of Bulk Viscous Pressure in the 14-moment approximation
• Bulk Viscosity Effects in Event-by-Event Relativistic Hydrodynamics
• Tomography of the Quark-Gluon-Plasma by Charm Quarks
• Towards the determination of heavy-quark transport coefficients in quark-gluon plasma
• Transport coefficients from the Nambu-Jona-Lasinio model for $SU(3{)}_f$
• Transport coefficients from the Nambu-Jona-Lasinio model for $SU(3{)}_f$
• Bulk viscosity-driven suppression of shear viscosity effects on the flow harmonics at RHIC
• Anisotropic shear viscosity of a strongly coupled non-Abelian plasma from magnetic branes
• Electric Conductivity from the solution of the Relativistic Boltzmann Equation
• Hadronic and partonic sources of direct photons in relativistic heavy-ion collisions
• Exploring the partonic phase at finite chemical potential within an extended off-shell transport approach
• Dissipative properties of hot and dense hadronic matter in excluded volume hadron resonance gas model
• Shear viscosity of a hadron gas and influence of resonance lifetimes on relaxation time
• Chiral symmetry restoration versus deconfinement in heavy-ion collisions at high baryon density
• Electric and magnetic response of hot QCD matter
• Hydrodynamic predictions for 5.02 TeV Pb-Pb collisions
• Bulk and shear viscosities of hot and dense hadron gas
• Estimating transport coefficients in hot and dense quark matter
• Transport coefficients for the hot quark-gluon plasma at finite chemical potential ${\mu }_B$
• Electrical conductivity and Hall conductivity of hot and dense quark gluon plasma in a magnetic field: a quasi particle approach
• A dynamical quasiparticle approach for the Quark-Gluon-Plasma bulk and transport properties
• Temperature dependence of bulk viscosity within lattice simulation of $SU(3)$--gluodynamics
• Transport coefficients in Polyakov quark meson coupling model: a relaxation time approximation
• Shear viscosity and electric conductivity of a hot and dense QGP with a chiral phase transition
• Impact of quark quasiparticles on transport coefficients in hot QCD
• Electrical and thermal conductivities of hot and dense hadron gas
• Transport coefficients of heavy quarks around $T_c$ at finite quark chemical potential
• SU(3) Polyakov linear-sigma model: Conductivity and viscous properties of QCD matter in thermal medium
• Quark Flavour Dependence of the Shear Viscosity in a Quasiparticle Model
• Medium effects on the thermal conductivity of a hot pion gas
• The quark susceptibility in a generalized dynamical quasiparticle model
• Building a testable shear viscosity across the QCD phase diagram
• Influence of electromagnetic fields in proton-nucleus collisions at relativistic energy
• Inclusive and effective bulk viscosities in the hadron gas
• Traces of non-equilibrium dynamics in relativistic heavy-ion collisions
• Exploring jet transport coefficients by elastic scattering in the strongly interacting quark-gluon plasma
• Traces of non-equilibrium effects, initial condition, bulk dynamics and elementary collisions in the charm observables
• Dissipative Properties and Isothermal Compressibility of Hot and Dense Hadron Gas using Non-extensive Statistics
• Shear viscosity in microscopic calculations of A+A collisions at energies of Nuclotron-based Ion Collider fAcility (NICA)
• Viscous effects on the dynamical evolution of QCD matter during the first-order confinement phase transition in heavy-ion collisions
• Hadron resonance gas with repulsive mean field interaction: Thermodynamics and transport properties
• Event-by-event fluctuations in p+p and central A+A collisions within relativistic transport models
• The Shear Viscosity to Entropy Density Ratio of Hagedorn States
• Inelastic and elastic parton scatterings in the strongly interacting quark-gluon plasma
• Estimating transport coefficients of interacting pion gas with K-matrix cross sections
• What are the early degrees of freedom in ultra-relativistic nucleus-nucleus collisions?
• Microcausality in strongly interacting fields
• On the contribution of plasminos to the shear viscosity of a hot and dense Yukawa-Fermi gas
• Nucleon matter equation of state, particle number fluctuations, and shear viscosity within UrQMD box calculations
• Viscous coefficients and thermal conductivity of a $\pi KN$ gas mixture in the medium
• Non-Abelian color fields from relativistic color charge configurations in the classical limit
• QCD at finite chemical potential in and out-of equilibrium
• In-medium effect on the thermodynamics and transport coefficients in van der Waals hadron resonance gas
• Transport coefficients of hot and dense matter
• Early thermalization and shear viscosity to entropy ratio in heavy-ion collisions at energies of BES, FAIR and NICA
• The quest for the quark-gluon plasma from the perspective of dynamical models of relativistic heavy-ion collisions
• The QGP dynamics in relativistic heavy-ion collisions