Noether current, horizon virasoro algebra, and entropy

Majhi, Bibhas ; Padmanabhan, T. (2012) Noether current, horizon virasoro algebra, and entropy Physical Review D, 85 (8). 084040_1-084040_13. ISSN 1550-7998

[img]
Preview
PDF - Author Version
250kB

Official URL: http://prd.aps.org/abstract/PRD/v85/i8/e084040

Related URL: http://dx.doi.org/10.1103/PhysRevD.85.084040

Abstract

We provide a simple and straightforward procedure for defining a Virasoro algebra based on the diffeomorphisms near a null surface in a space-time 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(gab,Rabcd) and define the Virasoro algebra from its variation. This allows us to identify the central charge and the zero-mode eigenvalue with 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.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:96234
Deposited On:13 Dec 2012 10:40
Last Modified:19 May 2016 08:45

Repository Staff Only: item control page