Bulk viscosity-driven suppression of shear viscosity effects on the flow harmonics at RHIC

Abstract

The interplay between shear and bulk viscosities on the flow harmonics, $v_n$'s, at RHIC is investigated using the newly developed relativistic 2+1 hydrodynamical code v-USPhydro that includes bulk and shear viscosity effects both in the hydrodynamic evolution and also at freeze-out. While shear viscosity is known to attenuate the flow harmonics, we find that the inclusion of bulk viscosity decreases the shear viscosity-induced suppression of the flow harmonics bringing them closer to their values in ideal hydrodynamical calculations. Depending on the value of the bulk viscosity to entropy density ratio, $\zeta /s$, in the quark-gluon plasma, the bulk viscosity-driven suppression of shear viscosity effects on the flow harmonics may require a re-evaluation of the previous estimates of the shear viscosity to entropy density ratio, $\eta /s$, of the quark-gluon plasma previously extracted by comparing hydrodynamic calculations to heavy ion data.

36 pages, 12 figures, references added

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Cited by in corpus (16)

• Transport coefficients for bulk viscous evolution in the relaxation time approximation
• Causality of the Einstein-Israel-Stewart Theory with Bulk Viscosity
• Viscous Effects on the Mapping of the Initial to Final State in Heavy Ion Collisions
• Bulk and shear viscosities of hot and dense hadron gas
• Skewness of elliptic flow fluctuations
• Relativistic quantum transport coefficients for second-order viscous hydrodynamics
• Influence of temperature dependent shear viscosity on elliptic flow at back- and forward rapidities in ultrarelativistic heavy-ion collisions
• Hydrodynamic Predictions for Mixed Harmonic Correlations in 200 GeV Au+Au Collisions
• Understanding the $p/\pi$ ratio at LHC due to QCD mass spectrum
• Flow harmonics within an analytically solvable viscous hydrodynamic model
• Bulk viscosity for pion and nucleon thermal fluctuation in the hadron resonance gas model
• Collective flow and hydrodynamics in large and small systems at the LHC
• Density Functional Equation of State and Its Application to the Phenomenology of Heavy-Ion Collisions
• Ultracentral Collisions of Small and Deformed Systems at RHIC: $UU$, $dAu$, ${}^{9}BeAu$, ${}^{9}Be{}^{9}Be$, ${}^{3}He{}^{3}He$, and ${}^{3}HeAu$ Collisions
• Projecting the likely importance of weak-interaction-driven bulk viscosity in neutron star mergers
• Extracting the strangeness freeze-out temperature from net-Kaon data at RHIC