Anti de Sitter space and black hole information

  • Thread starter lark
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So a string theory with gravity in anti de Sitter space apparently resolves the black hole information paradox via the adS/CFT correspondence.
I'm wondering: is the anti de Sitter space somehow necessary to string theory with gravity? Or is it just because there's this adS/CFT correspondence.
Also, this anti de Sitter space is 5-dimensional, I think.
The universe is expanding and cosmological spacetime looks like de Sitter space right now, I guess.
Can that 5-D anti de Sitter space be combined with de Sitter space? So that locally it would look like anti de Sitter space and on a large scale like de Sitter space?
thanks
Laura
 

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