Applicability of viscous hydrodynamics at RHIC
Denes Molnar (1,2), Pasi Huovinen (1,3) ((1) Physics Dept., Purdue, University; (2) RIKEN BNL Research Center, Brookhaven National Laboratory;, (3) Institute for Theoretical Physics, Johann Wolfgang Goethe University,, Frankfurt)
TL;DR
This paper examines the limits of viscous hydrodynamics applicability at RHIC, highlighting that the inclusion of bulk viscosity narrows the conditions under which it remains accurate.
Contribution
It extends previous work by demonstrating that bulk viscosity reduces the valid regime of Israel-Stewart viscous hydrodynamics at RHIC.
Findings
Viscous hydrodynamics accuracy is limited at higher shear viscosities.
Bulk viscosity further constrains the applicability of viscous hydrodynamics.
The valid shear viscosity range decreases when bulk viscosity is considered.
Abstract
In an earlier work (arXiv:0808.0953) we established that causal Israel-Stewart viscous hydrodynamics is only accurate in RHIC applications at very low shear viscosities 4 pi eta_s / s < ~ 1.5-2. We show here that the region of applicability is significantly reduced if bulk viscosity plays a role in the dynamics.
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