2012/04/30 by Bibhas Ranjan Majhi, T. Padmanabhan · 1 citation
Physics and Astronomy · #gr-qc #hep-th
paper · pdf · doi:10.1103/physrevd.86.101501
published as Phys. Rev. D 86, 101501(R) (2012) · v2: a comment added; accepted in PRD (Rapid Comm.)
arxiv created 2012/10/17 · arxiv updated 2012/11/07
We describe a simple way of obtaining horizon entropy using the approach based on the Virasoro algebra and central charge. We show that the Virasoro algebra defined by the Noether currents corresponding to the surface term of gravitational action, for the diffeomorphisms which leave the horizon structure unaltered, has a central extension that directly leads to the horizon entropy. In this approach there are no ambiguities in the calculation of the central charge. We explain why this approach is physically well motivated and could provide greater insight into the nature of horizon entropy.