Third-order relativistic dissipative hydrodynamics

Abstract

Following the procedure introduced by Israel and Stewart, we expand the entropy current up to the third order in the shear stress tensor ${\pi }^{\alpha \beta }$ and derive a novel third-order evolution equation for ${\pi }^{\alpha \beta }$. This equation is solved for the one-dimensional Bjorken boost-invariant expansion. The scaling solutions for various values of the shear viscosity to the entropy density ratio $\eta /s$ are shown to be in very good agreement with those obtained from kinetic transport calculations. For the pressure isotropy starting with 1 at ${\tau }_0=0.4fm/c$, the third-order corrections to Israel-Stewart theory are approximately 10\% for $\eta /s=0.2$ and more than a factor of 2 for $\eta /s=3$. We also estimate all higher-order corrections to Israel-Stewart theory and demonstrate their importance in describing highly viscous matters.

Version published in Phys.Rev.C. 5 pages, 1 figure

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