Bulk Viscosity of Interacting Hadrons

Wiranata, Anton; Prakash, Madappa

doi:10.1016/j.nuclphysa.2009.09.023

Cited by 19 publications

(15 citation statements)

References 4 publications

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“…However, for T → T + c , the specific bulk viscosity increases sharply following the behaviour of τ . Similarly, for T → T − c in the confined phase, a monotonic increase of ζ/s was found in different model calculations [118,[129][130][131]. Both observations together suggest that for strongly interacting matter the ratio ζ/s develops a maximum in the vicinity of T c [55][56][57][58].…”

Section: The Bulk Viscositysupporting

confidence: 55%

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: The Bulk Viscositysupporting

confidence: 55%

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

2011

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“…small value of shear viscosity to entropy density ratio (η/s), which is in accordance with the Kovtun-Son-Starinet (KSS) bound of (η/s) = 1/(4π) obtained using gauge gravity duality (AdS/CFT correspondence), can explain the flow data [1,6,7]. It may be emphasized that QCD is not conformal in nature and the deviation of the conformality is encoded in the bulk viscosity ζ of the strongly interacting medium [8][9][10][11][12][13][14][15][16]. Similar to the shear viscosity, bulk viscosity also plays a very impor-tant role in the viscous hydrodynamic description of the QCD medium [17][18][19][20].…”

Section: Introductionsupporting

confidence: 77%

Diffusion matrix associated with the diffusion processes of multiple conserved charges in a hot and dense hadronic matter

Das¹,

Mishra²,

Mohapatra³

2021

Preprint

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Bulk matter produced in heavy ion collisions has multiple conserved quantum numbers like baryon number, strangeness and electric charge. The diffusion process of these charges can be described by a diffusion matrix describing the interdependence of diffusion of different charges. The diffusion coefficient matrix is estimated here from the Boltzmann kinetic theory for the hadronic phase within relaxation time approximation. In the derivation for the same, we impose the Landau-Lifshitz conditions of fit. This leads to e.g. the diagonal diffusion coefficients to be manifestly positive definite. The explicit calculations are performed within the ambit of hadron resonance gas model with and without excluded volume corrections. It is seen that the off-diagonal components can be significant to affect the charge diffusion in a fluid with multiple conserved charges. The excluded volume correction effects is seen to be not significant in the estimation of the elements of the diffusion matrix.

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“…So one would expect to observe similar peak in ζ/s at T c as well. Indeed rise of bulk viscosity near T c has been observed in various effective models [5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Dissipative properties of hot and dense hadronic matter in an excluded-volume hadron resonance gas model

2015

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We estimate dissipative properties viz: shear and bulk viscosities of hadronic matter using relativistic Boltzmann equation in relaxation time approximation within ambit of excluded volume hadron resonance gas (EHRG) model. We find that at zero baryon chemical potential the shear viscosity to entropy ratio (η/s) decreases with temperature while at finite baryon chemical potential this ratio shows same behavior as a function of temperature but reaches close to Kovtun-Son-Starinets (KSS) bound. Further along chemical freezout curve, ratio η/s is almost constant apart from small initial monotonic rise. This observation may have some relevance to the experimental finding that the differential elliptic flow of charged hadrons does not change considerably at lower center of mass energy. We further find that bulk viscosity to entropy density (ζ/s) decreases with temperature while this ratio has higher value at finite baryon chemical potential at higher temperature. Along freezout curve ζ/s decreases monotonically at lower center of mass energy and then saturates.

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Bulk Viscosity of Interacting Hadrons

Cited by 19 publications

References 4 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

Diffusion matrix associated with the diffusion processes of multiple conserved charges in a hot and dense hadronic matter

Dissipative properties of hot and dense hadronic matter in an excluded-volume hadron resonance gas model

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