could you please tell me how to obtain gravity eqution from gravity field Action S as in detail as possible, especially the derivation of calculus of variations?(adsbygoogle = window.adsbygoogle || []).push({});

or you could point out some papers for me,

and thanks very very very very very very very very very much!

p.s. as in detail as possible! thanks!

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# [help]how to obtain gravity eqution from gravity field Action S?

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