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The holographic principle

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arxiv hep-th/0203101 v2 pith:UKOTJIYL submitted 2002-03-12 hep-th astro-phgr-qchep-phquant-ph

classification hep-thastro-phgr-qchep-phquant-ph
keywords holographicprinciplespacetimeboundinformationmustquantumregions
verification ladder T0 review T1 audit T2 compute T3 formal
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There is strong evidence that the area of any surface limits the information content of adjacent spacetime regions, at 10^(69) bits per square meter. We review the developments that have led to the recognition of this entropy bound, placing special emphasis on the quantum properties of black holes. The construction of light-sheets, which associate relevant spacetime regions to any given surface, is discussed in detail. We explain how the bound is tested and demonstrate its validity in a wide range of examples. A universal relation between geometry and information is thus uncovered. It has yet to be explained. The holographic principle asserts that its origin must lie in the number of fundamental degrees of freedom involved in a unified description of spacetime and matter. It must be manifest in an underlying quantum theory of gravity. We survey some successes and challenges in implementing the holographic principle.

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Cited by 16 Pith papers

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