Nonlinear Fluid Dynamics from Gravity

Details Nonlinear Fluid Dynamics from Gravity Nonlinear Fluid Dynamics from Gravity

2007-12-14

arxiv.org/abs/0712.2456v4

JHEP 0802:045,2008

Physics

High Energy Physics

High Energy Physics - Theory

46 pages, latex. v2: added refs and new section discussing second order hydrodynamics. v3: typos corrected. v4: typos correcte

Scientific paper

10.1088/1126-6708/2008/02/045

Black branes in AdS5 appear in a four parameter family labeled by their velocity and temperature. Promoting these parameters to Goldstone modes or collective coordinate fields -- arbitrary functions of the coordinates on the boundary of AdS5 -- we use Einstein's equations together with regularity requirements and boundary conditions to determine their dynamics. The resultant equations turn out to be those of boundary fluid dynamics, with specific values for fluid parameters. Our analysis is perturbative in the boundary derivative expansion but is valid for arbitrary amplitudes. Our work may be regarded as a derivation of the nonlinear equations of boundary fluid dynamics from gravity. As a concrete application we find an explicit expression for the expansion of this fluid stress tensor including terms up to second order in the derivative expansion.

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