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Title: Answering a basic objection to bang/crunch holography
Authors: McInnes, B. 
Keywords: AdS-CFT and dS-CFT Correspondence
Cosmology of Theories beyond the SM
Issue Date: 1-Oct-2004
Citation: McInnes, B. (2004-10-01). Answering a basic objection to bang/crunch holography. Journal of High Energy Physics 8 (10) : 351-379. ScholarBank@NUS Repository.
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. © SISSA/ISAS 2004.
Source Title: Journal of High Energy Physics
ISSN: 10298479
Appears in Collections:Staff Publications

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