별로 도움은 안되지만,
http://www.phys.huji.ac.il/~barak_kol/HDGR/proceedings/Brustein.pps
f(R) gravity에서 Wald entropy 계산:
D.N. Vollick, Phys. Rev. D76 (2007) 124001, "Noether charge and black hole entropy in modified theories of gravity". http://arxiv.org/abs/0710.1859
==> based on the Palatini formalism. connection이 일반적으로 metric compatible 하지 않음. 따라서 covariant derivative에 compatible인 새로운 metric을 이용해서 connection을 표현해야 한다. 이 새로운 metric을 이용하면 metric formalism을 그대로 적용 가능함.
R. Brustein, D. Gorbonos, M. Hadad and A.J.M. Medved, Phys.Rev. D84 (2011) 064011, "Evaluating the Wald entropy from two-derivative terms in quadratic actions". http://arxiv.org/abs/1106.4394
horizon에서 벗어난 영역에서의 Wald entropy 계산:
R. Brustein, and A.J.M. Medved, "Gravitational entropy and thermodynamics away from the horizon", http://arxiv.org/abs/1201.5754
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