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  The horizon-entropy increase law for causal and quasi-local horizons and conformal field redefinitions

Faraoni, V., & Nielsen, A. B. (2011). The horizon-entropy increase law for causal and quasi-local horizons and conformal field redefinitions. Classical and quantum gravity, 28(17): 175008. doi:10.1088/0264-9381/28/17/175008.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-03F7-E Version Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-03F8-C
Genre: Journal Article

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1103.2089 (Preprint), 229KB
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 Creators:
Faraoni, Valerio, Author
Nielsen, Alex B.1, Author              
Affiliations:
1Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_24013              

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Free keywords: General Relativity and Quantum Cosmology, gr-qc
 Abstract: We explicitly prove the horizon-entropy increase law for both causal and quasi-locally defined horizons in scalar-tensor and $f(R)$ gravity theories. Contrary to causal event horizons, future outer trapping horizons are not conformally invariant and we provide a modification of trapping horizons to complete the proof, using the idea of generalised entropy. This modification means they are no longer foliated by marginally outer trapped surfaces but fixes the location of the horizon under a conformal transformation. We also discuss the behaviour of horizons in "veiled" general relativity and show, using this new definition, how to locate cosmological horizons in flat Minkowski space with varying units, which is physically identified with a spatially flat FLRW spacetime.

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 Dates: 2011-03-102011
 Publication Status: Published in print
 Pages: 23 pages
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1103.2089
DOI: 10.1088/0264-9381/28/17/175008
 Degree: -

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Title: Classical and quantum gravity
Source Genre: Journal
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Publ. Info: Bristol, U.K. : Institute of Physics
Pages: - Volume / Issue: 28 (17) Sequence Number: 175008 Start / End Page: - Identifier: ISSN: 0264-9381
CoNE: /journals/resource/954925513480_1