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Communication Dans Un Congrès Année : 2023

Effective shear and bulk viscosities of the quark-gluon plasma: QCD versus heavy-ion data

Résumé

In recent years, there has been a significant effort to extract the temperature-dependent shear ($\eta/s$) and bulk ($\zeta/s$) viscosity over entropy ratios of the quark-gluon plasma from a global comparison of heavy-ion data with results of hydrodynamic simulations. However, anisotropic flow, which is arguably the most sensitive probe of viscosity, is only sensitive to an {\it effective\/} viscosity over entropy ratio, which is obtained by taking a weighted average over the temperature, and summing the contributions of shear and bulk. We estimate this effective viscosity using existing first-principles calculations, which give $0.17<(\eta/s)_{\rm eff}<0.21$, and $(\zeta/s)_{\rm eff}<0.08$, implying that the damping of anisotropic flow at the LHC is mostly due to shear viscosity. The values extracted from global data analyses are compatible with these theory predictions.

Dates et versions

hal-03758528 , version 1 (23-08-2022)

Identifiants

Citer

Fernando G. Gardim, Jean-Yves Ollitrault. Effective shear and bulk viscosities of the quark-gluon plasma: QCD versus heavy-ion data. 29th International Conference on Ultra-relativistic Nucleus-Nucleus Collisions, Apr 2022, Krakow, Poland. pp.1-A88, ⟨10.5506/APhysPolBSupp.16.1-A88⟩. ⟨hal-03758528⟩
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