Extracting hadronic viscosity from microscopic transport models

Demir, Nasser; Bass, Steffen A.

doi:10.1140/epjc/s10052-009-1000-8

Cited by 9 publications

(11 citation statements)

References 33 publications

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“…In order to study the effect of the kinetic freezeout on the generation of the elliptic flow we have performed two calculations one with a constant 4πη/s = 1 during all the evolution of the system (red dashed line of Fig.1) the other (shown by black solid line in Fig.1) with 4πη/s = 1 in the QGP phase and an increasing η/s in the cross over region towards the estimated value for hadronic matter 4πη/s = 8 [14]. Such an increase allows for a smooth realistic realization of the kinetic freeze-out.…”

Section: Effect Of Temperature Dependent η/S(t)mentioning

confidence: 99%

Elliptic flow and shear viscosity within a transport approach from RHIC to LHC energy

Plumari¹,

Greco²

2012

AIP Conference Proceedings

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We have investigated the build up of anisotropic flows within a parton cascade approach at fixed shear viscosity to entropy density η/s to study the generation of collective flows in ultrarelativistic heavy ion collisions. We present a study of the impact of a temperature dependent η/s(T ) on the generation of the elliptic flow at both RHIC and LHC. Finally we show that the transport approach, thanks to its wide validity range, is able to describe naturally the rise -fall and saturation of the v 2 (p T ) observed at LHC.

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Section: Effect Of Temperature Dependent η/S(t)mentioning

confidence: 99%

Elliptic flow and shear viscosity within a transport approach from RHIC to LHC energy

Plumari¹,

Greco²

2012

AIP Conference Proceedings

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“…with the expectation d 3 x δT (0)δT (x) and ∂ β = − d 3 x δT 00 (0)δT 00 (x) being given in Eq.s (15)(16).…”

Section: A Calculating the Bulk Viscosity Through The Kubo Relationmentioning

confidence: 99%

“…with the integral being given in Eq. (16). To calculate the change if thermal equilibrium were maintained, one can apply conservation of entropy and particle number to find expressions for the changes in energy density and particle density during a time ∆τ ,…”

Section: B Alternate Derivation Of ζmentioning

confidence: 99%

Coupling relativistic viscous hydrodynamics to Boltzmann descriptions

Pratt

Torrieri

2010

Phys. Rev. C

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Models of relativistic heavy ion collisions typically involve both a hydrodynamic module to describe the high density liquid-like phase and a Boltzmann module to simulate the low density breakup phase which is gas-like. Coupling the prescriptions is more complicated for viscous prescriptions if one wants to maintain continuity of the entire stress-energy tensor and currents. Derivations for the viscosity for a gas are reviewed, which then lead to expressions for changes in the phase space occupation based on simple relaxation-time pictures of viscosity. These expressions are shown to consistently reproduce the non-equilibrium components of the stress-energy tensor. An algorithm for generating a Monte Carlo sampling of particles with which to initiate the Boltzmann calculations is also presented.

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“…There are two main theoretical approaches to estimate the value of η/s from the experimental data. One based on a microscopic approach as in transport theory [6][7][8][9][10] and other related to a macroscopic approach through relativistic viscous hydrodynamic calculations [11][12][13][14][15][16][17][18]. In this work, we will compare our results from a relativistic 2+1 dimension viscous hydrodynamics to recent high statistics experimental data on elliptic (v 2 ) and hexadecapole (v 4 ) flow of charged hadrons measured by the PHENIX Collaboration [19,20].…”

Section: Introductionmentioning

confidence: 98%

Comparison of results from a (2+1)-D relativistic viscous hydrodynamic model to elliptic and hexadecapole flow of charged hadrons measured in Au-Au collisions atsNN=200GeV

2012

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Simulated results from a 2+1D relativistic viscous hydrodynamic model have been compared to the experimental data on the centrality dependence of invariant yield, elliptic flow (v2), and hexadecapole flow (v4) as a function of transverse momentum (pT ) of charged hadrons in Au-Au collisions at √ sNN = 200 GeV. Results from two types of initial transverse energy density profile, one based on the Glauber model and other based on Color-Glass-Condensate (CGC) are presented. We observe no difference in the simulated results on the invariant yield of charged hadrons for the calculations with different initial conditions. The comparison to the experimental data on invariant yield of charged hadrons supports a shear viscosity to entropy density ratio (η/s) between 0 to 0.12 for the 0-10% to 40-50% collision centralities. The simulated v2(pT ) is found to be higher for a fluid with CGC based initial condition compared to Glauber based initial condition for a given collision centrality. Consequently the Glauber based calculations when compared to the experimental data requires a lower value of η/s relative to CGC based calculations. In addition, a centrality dependence of the estimated η/s is observed from the v2(pT ) study. The v4(pT ) for the collision centralities 0-10% to 40-50% supports a η/s value between 0 -0.08 for a CGC based initial condition. While simulated results using the Glauber based initial condition for the ideal fluid evolution under estimates the v4(pT ) for collision centralities 0-10% to 30-40%.

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Extracting hadronic viscosity from microscopic transport models

Cited by 9 publications

References 33 publications

Elliptic flow and shear viscosity within a transport approach from RHIC to LHC energy

Elliptic flow and shear viscosity within a transport approach from RHIC to LHC energy

Coupling relativistic viscous hydrodynamics to Boltzmann descriptions

Comparison of results from a (2+1)-D relativistic viscous hydrodynamic model to elliptic and hexadecapole flow of charged hadrons measured in Au-Au collisions atsNN=200GeV

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