 f(R) gravity

ID: f-r-gravity

An f(R) theory replaces the Ricci scalar in the gravitational action by a smooth function

f (R)

f^{'} (R) R_{ab} - \frac{1}{2} f (R) g_{ab} + (g_{ab} □ - \nabla_{a} \nabla_{b}) f^{'} (R) = 8 π T_{ab} .

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