Bulk viscosity and spectral functions in QCD

Saremi, Omid

doi:10.1088/1126-6708/2008/09/015

Cited by 145 publications

(190 citation statements)

References 48 publications

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“…Clearly, the extraction of transport coefficients from lattice QCD simulations is a difficult task [59,79] and results seem far from being conclusive. Following the arguments in [121,122], we focus on the lattice QCD results for η/s from [64].…”

Section: T C η/S Rises To Quite Large Values For T → T +mentioning

confidence: 99%

“…In QCD, as quantum fluctuations break the scale invariance, the bulk viscosity is nonzero at finite T and approaches zero only for asymptotically large T . In the vicinity of the deconfinement phase transformation, the dimensionless specific bulk viscosity ζ /s is expected to become large and even to diverge at a second-order phase transition [55][56][57][58][59][60][61]. However, there are examples of strongly coupled theories [62,63] for which the contrary is found.…”

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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Section: T C η/S Rises To Quite Large Values For T → T +mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

2011

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“…The large T limit is numerically consistent with the perturbative QCD results displayed in figures 8 and 9, and shows a very strong growth as T c is approached. However, it should be mentioned that Moore and Saremi have challenged this analysis [44].…”

Section: Bulk Viscositymentioning

confidence: 99%

Viscous Properties of Strongly Interacting Matter at High Temperature

Kapusta

2010

Relativistic Heavy Ion Physics

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Substantial collective flow is observed in collisions between large nuclei at high energy, and the data are well-reproduced by perfect fluid dynamics. In a separate development, calculation of the dimensionless ratio of shear viscosity η to entropy density within AdS/CFT yields η/s = 1/4π, which has been conjectured to be a lower bound for any physical system. It is shown that the transition from hadrons to quarks and gluons has behavior similar to helium, nitrogen, and water at and near their phase transitions in the ratio η/s. Conversely, there are indications that the ratio of bulk viscosity ζ to entropy density may have a maximum in the vicinity of the phase transition. Therefore it is possible that experimental measurements can pinpoint the location of the transition or rapid crossover in QCD via the ratios η/s and ζ/s in addition to and independently of the equation of state.

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“…a next-to-leading order (NLO) spectral function was first determined in the bulk channel in [17], building on the earlier work of [18][19][20] (see also [21]). Since then, the techniques developed in these papers have been further generalized to include the case of non-vanishing external three-momenta [22], motivated by applications beyond QCD, most importantly studies of the leptogenesis scenario.…”

Section: Jhep03(2015)138mentioning

confidence: 99%

On the infrared behavior of the shear spectral function in hot Yang-Mills theory

Vuorinen

Zhu

2015

J. High Energ. Phys.

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Abstract:We revisit the determination of the two-loop spectral function in the shear channel of hot Yang-Mills theory. Correcting a technical error in an earlier computation is seen to improve the infrared behavior of the quantity significantly, while a partial Hard Thermal Loop resummation is seen to have only a very minor numerical effect on the result. These facts make it possible to straightforwardly apply the spectral function to the corresponding imaginary time correlator and the shear sum rule.

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Bulk viscosity and spectral functions in QCD

Cited by 145 publications

References 48 publications

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

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

Viscous Properties of Strongly Interacting Matter at High Temperature

On the infrared behavior of the shear spectral function in hot Yang-Mills theory

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