Journal
CLASSICAL AND QUANTUM GRAVITY
Volume 27, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0264-9381/27/2/025006
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Funding
- US Department of Energy [DE-FG02-00ER41132]
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Fluid dynamics corresponds to the dynamics of a substance in the long wavelength limit. Writing down all terms in a gradient (long wavelength) expansion up to second order for a relativistic system at vanishing charge density, one obtains the most general (causal) equations of motion for a fluid in the presence of shear and bulk viscosity, as well as the structure of the non-equilibrium entropy current. Requiring positivity of the divergence of the non-equilibrium entropy current relates some of its coefficients to those entering the equations of motion. I comment on possible applications of these results for conformal and non-conformal fluids.
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