hep-th/0312102 Transient Quintessence from Group Manifold Reductions or

• Main Authors: E. Bergshoeff, A. Collinucci, U. Gran, M. Nielsen, D. Roest
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Published: 2004
• Subjects: Arctic; Sitter
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.266.9231; http://arxiv.org/pdf/hep-th/0312102v3.pdf

We investigate the accelerating phases of cosmologies supported by a metric, scalars and a single exponential scalar potential. The different solutions can be represented by trajectories on a sphere and we find that quintessence happens within the “arctic circle” of the sphere. Furthermore, we obtain multi-exponential potentials from 3D group manifold reductions of gravity, implying that such potentials can be embedded in gauged supergravities with an M-theory origin. We relate the double exponential case to flux compactifications on maximally symmetric spaces and S-branes. In the triple exponential case our analysis Since the observational evidence for an accelerating universe and a nonzero cosmological constant [1,2], there has been a growing interest in finding (stable or unstable) De Sitter solutions [3–7] or more general accelerating cosmologies from M-theory [8–25] (for general