I don't see how in a static fluid the diagonal, space-like components of the stress-energy tensor are represented by pressure when every component of the stress-energy tensor is supposed to represent momentum in one direction or another. If a volume element of fluid is at rest (in my frame of reference) aren't the space-like components of its 4-momentum vector equal to zero?(adsbygoogle = window.adsbygoogle || []).push({});

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# The stress energy tensor again

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