Noether Current, Horizon Virasoro Algebra and Entropy

Details Noether Current, Horizon Virasoro Algebra and Entropy Noether Current, Horizon Virasoro Algebra and Entropy

2011-11-08

arxiv.org/abs/1111.1809v2

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

V2: to appear in Phys. Rev. D

Scientific paper

We provide a simple and straightforward procedure for defining a Virasoro algebra based on the diffeomorphisms near a null surface in a spacetime and obtain the entropy density of the null surface from its central charge. We use the off-shell Noether current corresponding to the diffeomorphism invariance of a gravitational Lagrangian $L(g_{ab},R_{abcd})$ and define the Virasoro algebra from its variation. This allows us to identify the central charge and the zero mode eigenvalue using which we obtain the entropy density of the Killing horizon. Our approach works for all Lanczos-Lovelock models and reproduces the correct Wald entropy. The entire analysis is done off-shell without using the field equations and allows us to define an entropy density for any null surface which acts as a local Rindler horizon for a particular class of observers.

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