Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2009-03-12
Phys.Lett.B677:326-331,2009
Physics
High Energy Physics
High Energy Physics - Theory
11 pages, v2,3: refs added, minor changes
Scientific paper
We point out that the entropies of black holes in general diffeomorphism invariant theories, computed using the Kerr-CFT correspondence and the Wald formula (as implemented in the entropy function formalism), need not always agree. A simple way to illustrate this is to consider Einstein-Gauss-Bonnet gravity in four dimensions, where the Gauss-Bonnet term is topological. This means that the central charge of Kerr-CFT computed in the Barnich-Brandt-Compere formalism remains the same as in Einstein gravity, while the entropy computed using the entropy function gives a universal correction proportional to the Gauss-Bonnet coupling. We argue that at least in this example, the Kerr-CFT result is the physically reasonable one. The resolution to this discrepancy might lie in a better understanding of boundary terms.
Krishnan Chethan
Kuperstein Stanislav
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