Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Information and Coarse-Graining in Eternal Black Holes   Recently it was shown in the context of the AdS/CFT correspondence that the
classical gravity description inevitably involves coarse-graining of some
degrees. In this note we clarify the nature of this coarse-graining both in
gravity and field theory sides. We show that the information carried by the
bulk classical gravity fluctuation is transferred to the coarse-grained
nonclassical degrees through tiny interactions, which makes the recovery of
information almost impossible. Of course, the total system is evolving
unitarily fully preserving its information as dictated by the basic construct
of the AdS/CFT correspondence.

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The categories of this paper are: hep-ex
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The categories of this paper are: solv-int
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-ph
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The categories of this paper are: physics
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The categories of this paper are: atom-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: math-ph
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The categories of this paper are: stat
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The categories of this paper are: nucl-ex
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The categories of this paper are: nlin
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The categories of this paper are: eess
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The categories of this paper are: supr-con
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The categories of this paper are: astro-ph
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-th