2020/05/24 by Fabio S. Bemfica, Marcelo M. Disconzi, Vu Hoang +2 · 1 citation
Mathematics · Physics and Astronomy · #gr-qc #hep-th #math-ph #math.MP #nucl-th #physics.flu-dyn
paper · pdf · doi:10.1103/physrevlett.126.222301
published as Phys. Rev. Lett. 126, 222301 (2021) · 18 pages, 1 figure
arxiv created 2020/05/24 · arxiv updated 2021/06/09
New constraints are found that must necessarily hold for Israel-Stewart-like theories of fluid dynamics to be causal far away from equilibrium. Conditions that are sufficient to ensure causality, local existence, and uniqueness of solutions in these theories are also presented. Our results hold in the full nonlinear regime, taking into account bulk and shear viscosities (at zero chemical potential), without any simplifying symmetry or near-equilibrium assumptions. Our findings provide fundamental constraints on the magnitude of viscous corrections in fluid dynamics far from equilibrium.