I have the impression that the complete list of the identities satisfied in these cases is not yet known.

]]>You can find better explanation than “The Meaning of Einstein’s Equation” (John Baez).

http://settheory.net/cosmology

http://settheory.net/general-relativity

– It is directly applied to an important example (universal expansion)

– The expression is simpler (relating 1 component of the energy tensor

to 3 components of the Riemann tensor)

– The relation between energy and curvature is not only expressed but

also justified

– Both (diagonal) space and time components of the relation are

expressed and justified, resulting in showing their similarity “like a

coincidence”.

http://hal.archives-ouvertes.fr/hal-01020088

Do you think so?

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