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<record xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:prov="http://www.openarchives.org/OAI/2.0/provenance" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dri="http://www.driver-repository.eu/namespace/dri" xmlns:dr="http://www.driver-repository.eu/namespace/dr" xmlns:oaf="http://namespace.openaire.eu/oaf">
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<header xmlns="http://namespace.openaire.eu/">
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<dri:recordIdentifier>a49ee326-3d66-4f95-b775-362c7be0af2a_TURTdG9yZURTUmVzb3VyY2VzL01EU3RvcmVEU1Jlc291cmNlVHlwZQ==::oai:arXiv.org:1003.3012</dri:recordIdentifier>
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<dri:repositoryId>feaee13a-e5fb-4b5b-b1ba-9c27aa2ecc92_UmVwb3NpdG9yeVNlcnZpY2VSZXNvdXJjZXMvUmVwb3NpdG9yeVNlcnZpY2VSZXNvdXJjZVR5cGU=</dri:repositoryId>
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<dr:objectIdentifier/>
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<dr:dateOfCollection>2014-01-28T13:52:45Z</dr:dateOfCollection>
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</header>
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<metadata xmlns="http://namespace.openaire.eu/">
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<dc:creator>Bousso, Raphael</dc:creator>
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<dc:creator>Freivogel, Ben</dc:creator>
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<dc:creator>Leichenauer, Stefan</dc:creator>
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<dc:dateAccepted>2010-03-15</dc:dateAccepted>
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<dc:description> The covariant entropy bound states that the entropy, S, of matter on a
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light-sheet cannot exceed a quarter of its initial area, A, in Planck units.
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The gravitational entropy of black holes saturates this inequality. The entropy
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of matter systems, however, falls short of saturating the bound in known
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examples. This puzzling gap has led to speculation that a much stronger bound,
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S< A^{3/4}, may hold true. In this note, we exhibit light-sheets whose entropy
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exceeds A^{3/4} by arbitrarily large factors. In open FRW universes, such
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light-sheets contain the entropy visible in the sky; in the limit of early
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curvature domination, the covariant bound can be saturated but not violated. As
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a corollary, we find that the maximum observable matter and radiation entropy
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in universes with positive (negative) cosmological constant is of order
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Lambda^{-1} (Lambda^{-2}), and not |Lambda|^{-3/4} as had hitherto been
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believed. Our results strengthen the evidence for the covariant entropy bound,
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while showing that the stronger bound S< A^{3/4} is not universally valid. We
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conjecture that the stronger bound does hold for static, weakly gravitating
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systems.
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</dc:description>
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<dc:description>Comment: 36 pages, 10 figures</dc:description>
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<dc:identifier>http://arxiv.org/abs/1003.3012</dc:identifier>
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<dc:language>eng</dc:language>
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<dc:title>Saturating the holographic entropy bound</dc:title>
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<dc:subject>High Energy Physics - Theory</dc:subject>
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<dc:subject>Astrophysics - Cosmology and Extragalactic Astrophysics</dc:subject>
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<dc:subject>General Relativity and Quantum Cosmology</dc:subject>
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<dc:subject>High Energy Physics - Phenomenology</dc:subject>
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<dr:CobjCategory>0001</dr:CobjCategory>
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<dr:CobjIdentifier>Phys.Rev.D82:084024,2010</dr:CobjIdentifier>
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<dr:CobjIdentifier>doi:10.1103/PhysRevD.82.084024</dr:CobjIdentifier>
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<oaf:collectedDatasourceid>opendoar____::18</oaf:collectedDatasourceid>
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<oaf:accessrights>OPEN</oaf:accessrights>
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<oaf:hostedBy name="arXiv.org e-Print Archive" id="opendoar____::18"/>
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<oaf:collectedFrom name="arXiv.org e-Print Archive" id="opendoar____::18"/>
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<oaf:identifier identifierType="doi">10.1103/PhysRevD.82.084024</oaf:identifier>
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</metadata>
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</record>
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