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Variational principle for relativistic gas dynamics

For now I'll just mention that there's a small literature on variational principles for perfect fluids in relativity, though I'm not an expert on it. Here is a reference that discusses some approaches …
Igor Khavkine's user avatar
3 votes
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Compactly supported transverse traceless tensors

The answer is Yes, at least under the reasonable conditions that (i) the number of conformal Killing vectors locally admitted by $(M,g)$ is constant and that (ii) the de Rham cohomology $H^{n-1}(M)=0$ …
Igor Khavkine's user avatar