Entropy and Energy of Static Spherically Symmetric Black Hole in $f(R)$ theory

Rong-Jia Yang; Yaoguang Zheng

Entropy and Energy of Static Spherically Symmetric Black Hole in $f(R)$ theory

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arxiv 1907.05868 v3 pith:M3M7EOUZ submitted 2019-07-11 gr-qc hep-th

Yaoguang Zheng , Rong-Jia Yang This is my paper

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abstract

We consider the new horizon first law in $f(R)$ theory with general spherically symmetric black hole. We derive the general formulas to computed the entropy and energy of the black hole. For applications, some nontrivial black hole solutions in some popular $f(R)$ theories are investigated, the entropies and the energies of black holes in these models are first calculated.

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Thermodynamics of FLRW universe in Quadratic Gravity
gr-qc 2025-07 reject novelty 5.0 of 10

Quadratic-gravity terms are claimed to shift the thermodynamic phase structure of the FLRW apparent horizon, but the printed critical-radius formula does not follow from the paper's own equation of state.

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