1306.5063 (Olaf Dreyer et al.)

Entropy from near-horizon geometries of Killing horizons    [PDF]

Olaf Dreyer, Amit Ghosh, Avirup Ghosh

We derive black hole entropy based on the near-horizon symmetries of black hole space-times. To derive these symmetries we make use of an $(R,T)$-plane close to a Killing horizon. We identify a set of vector fields that preserves this plane and forms a Witt algebra. The corresponding algebra of Hamiltonians is shown to have a non-trivial central extension. Using the Cardy formula and the central charge we obtain the Bekenstein-Hawking entropy.

View original: http://arxiv.org/abs/1306.5063