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I understand energy-momentum tensor with contravariant indices, where
I think I get [itex]T^{αβ}[/itex], but how do I derive the same result for [itex]T_{αβ}[/itex]? Why are the contravariant vectors simply changed to covariant ones, and why does it work in Einstein's equation?
I think I get [itex]T^{αβ}[/itex], but how do I derive the same result for [itex]T_{αβ}[/itex]? Why are the contravariant vectors simply changed to covariant ones, and why does it work in Einstein's equation?