Quasi-particle description of strongly interacting matter: Towards a foundation

Bluhm, Marcus; Kämpfer, B.; Schulze, R.; Seipt, D.

doi:10.1140/epjc/s10052-006-0056-y

Cited by 39 publications

(49 citation statements)

References 61 publications

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“…Based on the quasiparticle model [57], which is an effective model used to reproduce the lattice QCD results on various thermodynamic and transport properties [58], the bulk viscosity ξ reads…”

Section: A Equations Of State Of the Viscous Quark-gluon Plasmamentioning

confidence: 99%

Quark-hadron phase transitions in the viscous early universe

Tawfik

Harkó

2012

Phys. Rev. D

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In the standard hot big bang theory, when the Universe was about 1 − 10 µs old, the cosmological matter is conjectured to undergo Quantum Chromodynamics (QCD) phase transition(s) from quark matter to hadrons. In the present work, we study the cosmological quark-hadron phase transition in two different physical scenarios. First, by assuming that the phase transition would be described by an effective nucleation theory (prompt first-order phase transition), we analyze the evolution of the relevant cosmological parameters of the early Universe (energy density ρ, temperature T , Hubble parameter H and the scale factor a) before, during and after the phase transition. To study the cosmological dynamics and the time evolution, we use both analytical and numerical methods. The case where the Universe evolved through a mixed phase with a small initial supercooling and monotonically growing hadronic bubbles is also considered in detail. The numerical estimation of the cosmological parameters, a and H for instance, shows that the time evolution of the Universe varies from phase to phase. As the QCD era turns to be fairly accessible in the high-energy experiments and the lattice QCD simulations, the QCD equation of state is very well defined. In light of these QCD results, we develop a systematic study of the crossover quark-hadron phase transition and an estimation for the time evolution of the Hubble parameter during the crossover .

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Section: A Equations Of State Of the Viscous Quark-gluon Plasmamentioning

confidence: 99%

Quark-hadron phase transitions in the viscous early universe

Tawfik

Harkó

2012

Phys. Rev. D

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“…(1) and (2), one also has to specify the self-energy (T ). We adopt the quasiparticle model [86][87][88][89][90][91] with (T ) = T 2 G 2 (T )/2 and use the effective coupling [86][87][88][89] …”

Section: Temperature-dependent Self-energymentioning

confidence: 99%

“…The entropy density s in the QPM (cf. [91,92]) was calculated by using the parametrization (5) for G 2 (T ), entering also the viscosities, such that results on equilibrium thermodynamics for the pure gluon plasma obtained in lattice QCD are reproduced (see Fig. 1).…”

Section: The Shear Viscositymentioning

confidence: 99%

“…Thus, T is the only thermal variable characterizing properties of the system. The QPM was successfully employed to quantitatively describe lattice QCD results of equilibrium thermodynamics such as the EoS and related quantities [90][91][92][93][94]. In the following, we apply this model to systems exhibiting small departures from thermal equilibrium by using the results of an effective kinetic-theory approach [71,72] for shear and bulk viscosities derived for a quasiparticle system in [95].…”

Section: Introductionmentioning

confidence: 99%

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Shear and bulk viscosities of the gluon plasma in a quasiparticle description

2011

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Shear and bulk viscosities of deconfined gluonic matter are investigated within an effective kinetic theory by describing the strongly interacting medium phenomenologically in terms of quasiparticle excitations with medium-dependent self-energies. We show that the resulting transport coefficients reproduce the parametric dependencies on temperature and coupling obtained in perturbative QCD at large temperatures and small running coupling. The extrapolation into the nonperturbative regime results in a decreasing specific shear viscosity with decreasing temperature, exhibiting a minimum in the vicinity of the deconfinement transition, while the specific bulk viscosity is sizable in this region, falling off rapidly with increasing temperature. The temperature dependence of specific shear and bulk viscosities found within this quasiparticle description of the pure gluon plasma is in agreement with available lattice QCD results.

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“…In the following, we will investigate the relation Eq. (1) within a phenomenological quasiparticle model (QPM) [13,14], in which gluonic quasiparticles obey a temperature dependent dispersion relation.…”

Section: Relating Shear Viscosity and Jet Quenching Parametermentioning

confidence: 99%