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Accelerating expansion and change of signature
Published online by Cambridge University Press: 30 September 2008
Abstract
We show that some types of sudden singularities admit a natural explanation in terms of regular changes of signature on brane-worlds in AdS5. The present accelerated expansion of the Universe and its possible ending at a sudden singularity may therefore simply be an indication that our braneworld is about to change its Lorentzian signature to an Euclidean one, while remaining fully regular. An explicit example of this behaviour satisfying the weak and strong energy conditions is presented.
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- © EAS, EDP Sciences, 2008