An estimate of the bulk viscosity of the hadronic medium

Sarwar, Golam; Chatterjee, Sandeep; Alam, Jan-e

doi:10.1088/1361-6471/aa61b3

Cited by 19 publications

(22 citation statements)

References 72 publications

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“…[34] decreases up to T ∼ 0.150 GeV after which a mild increment is observed. Most of the earlier works [20,21,25,27,28,32,[34][35][36][37] based on effective QCD model calculations [20,21,25,27,28] as well as effective hadronic model calculations [32,[34][35][36][37] predicted a decreasing function of ζ/s(T ) in the hadronic temperature domain, which is qualitatively similar with our results (dashed lines). These are not supporting the fact that ζ/s diverges or becomes large near the transition temperature as indicated by Refs.…”

Section: Resultssupporting

confidence: 91%

“…However, after dividing by total entropy density, ζ/s appear as a decreasing function of T and with the variation of µ B , it increases first at low µ B region and then decreases at high µ B region. Along the beam energy axis, the ζ and ζ/s both decreases, as noticed in some earlier works [33][34][35].…”

Section: Discussionsupporting

confidence: 78%

“…Owing to that motivation, we have gone through a microscopic calculations of ζ and ζ/s, where equilibrium situations of hadronic matter are controlled by the standard HRG model and non-equilibrium picture of medium constituents is introduced via quantum fluctuation of pion and nucleon in medium. With respect to the earlier HRG calculations of ζ [33][34][35][36], the main distinguishable contribution is in the non-equilibrium properties of medium constituents, quantified by their thermal width. Assuming pions and nucleons as most abundant constituents of medium, we have calculated their thermal width, which are coming from their in-medium scattering with different possible mesonic and baryonic resonances.…”

Section: Introductionmentioning

confidence: 94%

“…A list of references are [2,[19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37], where Ref. [19] addressed high temperature perturbative QCD calculations of ζ, Refs.…”

Section: Introductionmentioning

confidence: 99%

“…These effective QCD model calculations [20][21][22][23][24][25][26][27][28] cover both QGP and hadronic phases while hadronic-model calculations of Refs. [32][33][34][35][36][37] are restricted within hadronic phase only. The present work is also addressing the estimation of ζ in the hadronic phase only.…”

Section: Introductionmentioning

confidence: 99%

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Bulk viscosity for pion and nucleon thermal fluctuation in the hadron resonance gas model

2016

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We have calculated microscopically bulk viscosity of hadronic matter, where equilibrium thermodynamics for all hadrons in medium are described by Hadron Resonance Gas (HRG) model. Considering pions and nucleons as abundant medium constituents, we have calculated their thermal widths, which inversely control the strength of bulk viscosities for respective components and represent their in-medium scattering probabilities with other mesonic and baryonic resonances, present in the medium. Our calculations show that bulk viscosity increases with both temperature and baryon chemical potential, whereas viscosity to entropy density ratio decreases with temperature and with baryon chemical potential, the ratio increases first and then decreases. The decreasing nature of the ratio with temperature is observed in most of the earlier investigations with few exceptions. We find that the temperature dependence of bulk viscosity crucially depends on the structure of the relaxation time. Along the chemical freeze-out line in nucleus-nucleus collisions with increasing collision energy, bulk viscosity as well as the bulk viscosity to entropy density ratio decreases, which also agrees with earlier references. Our results indicate the picture of a strongly coupled hadronic medium.

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Section: Resultssupporting

confidence: 91%

Section: Discussionsupporting

confidence: 78%

Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Bulk viscosity for pion and nucleon thermal fluctuation in the hadron resonance gas model

2016

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Finite size effect of hadronic matter on its transport coefficients

Samanta

Ghosh

Mohanty

2018

J. Phys. G: Nucl. Part. Phys.

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We have theoretically investigated the finite system size effect of hadronic matter on its transport coefficients like shear viscosity, bulk viscosity, and electrical conductivity. We have used a Hadron Resonance Gas (HRG) model to calculate the thermodynamical quantities like entropy density, speed of sound and also the above transport coefficients. All these quantities are found to be sensitive to finite system size effects of hadronic matter. The effect of finite system size is found to be more when the system is at low temperatures and gets reduced at high temperatures. Owing to the intimate linking between system size and centrality, we have presented the centrality dependence of transport coefficients. We have also explored to link of our results with the macroscopic picture of hydrodynamical evolution.

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Calculations of shear, bulk viscosities and electrical conductivity in the Polyakov-quark–meson model

Singha

Abhishek

Kadam

et al. 2018

J. Phys. G: Nucl. Part. Phys.

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We have calculated different transport coefficients like shear, bulk viscosities and electrical conductivity of quark and hadronic matter within the framework of 2 flavor Polyakov-Quark-Meson model. For constant thermal widths of quarks and mesons, the temperature dependence of different transport coefficients reveals the thermodynamical phase space structure and their qualitative behavior are quite well in agreement with earlier works, based on other dynamical models. Besides the phase-space structure of quarks and mesons, their thermal width also have explicit temperature dependence. This dependence has been obtained here from the imaginary part of their respective self-energies at finite temperature. Due to the threshold conditions of their self energies, only some limited temperature regions of quark and hadronic phase are relevant for our numerical estimation of transport coefficients, which are grossly in agreement with some of the earlier results. An interesting outcome of the present analysis is that the quark relaxation time due to quark-meson loops can develop perfect fluid nature within a specific temperature range.

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An estimate of the bulk viscosity of the hadronic medium

Abstract: The bulk viscosity (ζ) of the hadronic medium has been estimated within the ambit of the Hadron √ s N N ) and find that the bulk viscosity to entropy density ratio, ζ/s is larger at FAIR than LHC energies.

Cited by 19 publications

References 72 publications

Bulk viscosity for pion and nucleon thermal fluctuation in the hadron resonance gas model

Bulk viscosity for pion and nucleon thermal fluctuation in the hadron resonance gas model

Finite size effect of hadronic matter on its transport coefficients

Calculations of shear, bulk viscosities and electrical conductivity in the Polyakov-quark–meson model

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