hep-th/0312102 Transient Quintessence from Group Manifold Reductions or
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 obtai...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Text |
| Language: | English |
| Published: |
2004
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| Subjects: | |
| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.266.9231 http://arxiv.org/pdf/hep-th/0312102v3.pdf |
| Summary: | 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 |
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