why does the einstein field tensor have the riemann tensor contracted? I am confused as to what purpose it serves. I have seen an explanation that it gets rid of extra information about spacetime or something like that. and also is the Ricci scalar added to einstein tensor so that the covariant derivative of both sides of the field equation go to zero? thanks.(adsbygoogle = window.adsbygoogle || []).push({});

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# Contraction of riemann tensor

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