EAS Publications Series
Volume 30, 2008Spanish Relativity Meeting - Encuentros Relativistas Españoles , ERE2007: Relativistic Astrophysics and Cosmology
|Page(s)||307 - 310|
|Published online||30 September 2008|
A. Oscoz, E. Mediavilla and M. Serra-Ricart (eds)
EAS Publications Series, 30 (2008) 307-310
Accelerating expansion and change of signature
Dept. de Física Fundamental,
Universidad de Salamanca, Plaza de la Merced s/n, 37008 Salamanca, Spain
2 Física Teórica, Universidad del País Vasco, Apartado 644, 48080 Bilbao, Spain
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.
© EAS, EDP Sciences, 2008
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