Hopfion solutions in gravity and a null fluid/gravity conjecture
arXiv:1812.08630
Abstract
We conjecture an extension of the fluid/gravity correspondence to the null pressureless fluid case via gravitational shockwave solutions, and use it to propose an embedding of the fluid Hopfion in gravity. A nonlinear gravitational "helicity" is also proposed, analogous with the helicity of electromagnetism and fluid dynamics.
18 pages, no figures
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