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Paper detail

Deriving the gravitational field equation and horizon entropy for arbitrary diffeomorphism-invariant gravity from spacetime solid

Motivated by the analogy between the spacetime and the solid with inhomogeneous elasticity modulus, we present an alternative method to obtain the field equation of any diffeomorphism-invariant gravity, by extremizing the constructed entropy function of the displacement vector field of spacetime solid. In general stationary spacetimes, we show that the Wald entropy of horizon arises from the on-shell entropy function of spacetime solid.

preprint2010arXivOpen access
Shao-Feng WuBin WangXian-Hui GeGuo-Hong Yang
gr-qc
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Shao-Feng WuBin WangXian-Hui GeGuo-Hong Yang

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