Recurrent acceleration in dilaton-axion cosmology

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Julian Sonner and Paul K. Townsend
Department of Applied Mathematics and Theoretical Physics, Centre for Mathematical Sciences, University of Cambridge, Wilberforce Road, Cambridge, CB3 0WA, United Kingdom

Received 21 September 2006; published 7 November 2006

Aclass of Einstein-dilaton-axion models is found for which almost allflat expanding homogeneous and isotropic universes undergo recurrent periods ofacceleration. We also extend recent results on eternally accelerating openuniverses.

URL:	http://link.aps.org/doi/10.1103/PhysRevD.74.103508
DOI:	10.1103/PhysRevD.74.103508
PACS:	98.80.-k; 05.45.-a; 14.80.Mz 98.80.-k Cosmology 05.45.-a Nonlinear dynamics and nonlinear dynamical systems 14.80.Mz Axions and other Nambu–Goldstone bosons (Majorons, familons, etc.) YEAR: 2006
KEYWORDS:	cosmology, cosmic acceleration, gravitation, space-time configurations

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