Evaluating the Wald entropy from two-derivative terms in quadratic actions

Title: Evaluating the Wald entropy from two-derivative terms in quadratic actions
Creator: Brustein, R
Creator: Gorbonos, D
Creator: Hadad, M
Creator: Medved, A J M
Date Issued: 2011
Date: 2011
Type: Article
Identifier: vital:6816
Identifier: http://hdl.handle.net/10962/d1004326
Description: We evaluate the Wald Noether charge entropy for a black hole in generalized theories of gravity. Expanding the Lagrangian to second order in gravitational perturbations, we show that contributions to the entropy density originate only from the coefficients of two-derivative terms. The same considerations are extended to include matter fields and to show that arbitrary powers of matter fields and their symmetrized covariant derivatives cannot contribute to the entropy density. We also explain how to use the linearized gravitational field equation rather than quadratic actions to obtain the same results. Several explicit examples are presented that allow us to clarify subtle points in the derivation and application of our method.
Format: 31 pages
Format: pdf
Language: English
Relation: Brustein, R and Gorbonos, D and Hadad, M and Medved, A.J.M (2011) Evaluating the Wald entropy from two-derivative terms in quadratic actions. Physical Review D, 84 (6). Available: http://dx.doi.org/10.1103/PhysRevD.84.064011

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Medved, Joey (Prof)

RU Department of Physics and Electronics

SDG 09. Industry, Innovation and Infrastructure

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