Hi, in gravitational theory the action integral is:(adsbygoogle = window.adsbygoogle || []).push({}); but I do not know why there is a square root -g . Could you give me the proof of this integral???? I mean How is this integral constructed??? What is the logic of this???? Thanks in advance....I = ∫( − g ( x))^1/2 L ( x) d 4 x,

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# I Gravitational Lagrangian density

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