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- W3105777732 abstract "The current cosmic acceleration does not imply that our Universe is basically de Sitter-like: in the first part of this work we argue that, by introducing matter into *anti-de Sitter* spacetime in a natural way, one may be able to account for the acceleration just as well. However, this leads to a Big Crunch, and the Euclidean versions of Bang/Crunch cosmologies have [apparently] disconnected conformal boundaries. As Maldacena and Maoz have recently stressed, this seems to contradict the holographic principle. In the second part we argue that this double boundary problem is a matter not of geometry but rather of how one chooses a conformal compactification: if one chooses to compactify in an unorthodox way, then the appearance of disconnectedness can be regarded as a *coordinate effect*. With the kind of matter we have introduced here, namely a Euclidean axion, the underlying compact Euclidean manifold has an unexpectedly non-trivial topology: it is in fact one of the 75 possible underlying manifolds of flat compact four-dimensional Euclidean spaces." @default.
- W3105777732 created "2020-11-23" @default.
- W3105777732 creator A5082581961 @default.
- W3105777732 date "2004-10-09" @default.
- W3105777732 modified "2023-09-25" @default.
- W3105777732 title "Answering a Basic Objection to Bang/Crunch Holography" @default.
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- W3105777732 doi "https://doi.org/10.1088/1126-6708/2004/10/018" @default.
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