Higher curvature Lagrangians, conformal symmetry and microscopic entropy of Killing horizons
arXiv:hep-th/0306021 · doi:10.1016/j.physletb.2003.07.075
Abstract
We impose a certain class of boundary conditions on Killing horizon and show for Lagrangians with arbitrary curvature dependence that one can identify a Virasoro algebra with nontrivial central charge and calculable Hamiltonian eigenvalue. Entropy can then be calculated from Cardy formula.
11 pages