From Petrov-Einstein to Navier-Stokes

Abstract

We consider a p+1-dimensional timelike hypersurface Σ_c embedded with a flat induced metric in a p+2-dimensional Einstein geometry. It is shown that imposing a Petrov type I condition on the geometry reduces the degrees of freedom in the extrinsic curvature of Σ_c to those of a fluid in Σ_c. Moreover, expanding around a limit in which the mean curvature of the embedding diverges, the leading-order Einstein constraint equations on Σ_c are shown to reduce to the non-linear incompressible Navier-Stokes equation for a fluid moving in Σ_c.

Added references, discussion and appendix detailing alternate boundary conditions with fixed mean curvature

References in corpus (2)

• Classification of the Weyl Tensor in Higher Dimensions and Applications
• A generalized Damour-Navier-Stokes equation applied to trapping horizons