A comparative study on two different approaches of bulk viscosity in the Polyakov–Nambu–Jona-Lasinio model

Saha, K. C.; Upadhaya, Sudipa; Ghosh, Sabyasachi

doi:10.1142/s0217732317500183

Cited by 11 publications

(15 citation statements)

References 110 publications

(137 reference statements)

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“…Hence, bulk viscosity able to map that peak structure only for a mild T dependent or constant values of thermal width of medium constituents as we notice in Refs. [54,45,42,43,21]. However, a strong T dependent thermal width or relaxation time can suppress the foot print of peak structure as observed in Refs.…”

Section: Numerical Results and Discussionmentioning

confidence: 98%

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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Section: Numerical Results and Discussionmentioning

confidence: 98%

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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“…[4]. However, some investigations have reported it to increase with T and some time also have a peak structure near transition temperature [7].…”

Section: Results and Conclusionmentioning

confidence: 99%

Bulk Viscosity Coefficient of Hadronic Matter

Ghosh

Chatterjee

Mohanty

2018

XXII DAE High Energy Physics Symposium

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The bulk viscosity coefficient of hadronic matter has been estimated in this present work, where the thermodynamical equilibrium quantity like speed of sound in the medium has been obtained by using standard hadron resonance gas model. Whereas, the non-equilibrium quantity like thermal widths of medium constituents have been calculated in the framework field theory at finite temperature. Our values of bulk viscosity coefficient are in agreement with some earlier estimations.

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“…The predicted values of η/s from earlier estimations reside within a broad numerical band. Same is observed for bulk viscosity ζ [5,8,[13][14][15][16][17][18][19][20][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43].…”

Section: Introductionmentioning

confidence: 85%

Phenomenological bound on the viscosity of the hadron resonance gas

Ghosh¹,

Ghosh²,

Bhattacharyya³

2018

Phys. Rev. C

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We have explored some phenomenological issues during calculations of transport coefficients for hadronic matter, produced in the experiments of heavy ion collisions. Here, we have used an ideal hadron resonance gas model to demonstrate the issues. On the basis of dissipation mechanism, the hadronic zoo is classified into resonance and non-resonance members, who participate in dissipation via strong decay and scattering channels respectively. Imposing our phenomenological restriction, we are able to provide a rough upper and lower bound estimations of transport coefficients. Interestingly, we find that our proposed lower limit estimation for shear viscosity to entropy density ratio is little larger than its quantum lower bound. By taking a simple example, we have demonstrated how our proposed restriction help to tune any estimation of transport coefficients within its numerical band, proposed by us.

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A comparative study on two different approaches of bulk viscosity in the Polyakov–Nambu–Jona-Lasinio model

Cited by 11 publications

References 110 publications

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

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

Bulk Viscosity Coefficient of Hadronic Matter

Phenomenological bound on the viscosity of the hadron resonance gas

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