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  Coupled quintessence and curvature-assisted acceleration

Bieli, R. (2006). Coupled quintessence and curvature-assisted acceleration. Classical and Quantum Gravity, 23, 5983-5995.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-4C50-8 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-4C51-6
Genre: Journal Article

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0606113.pdf (Preprint), 198KB
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 Creators:
Bieli, Roger1, Author              
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1Geometric Analysis and Gravitation, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_24012              

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 Abstract: Spatially homogeneous models with a scalar field non-minimally coupled to the space-time curvature or to the ordinary matter content are analysed with respect to late-time asymptotic behaviour, in particular to accelerated expansion and isotropization. It is found that a direct coupling to the curvature leads to asymptotic de Sitter expansion in arbitrary exponential potentials, thus yielding a positive cosmological constant although none is apparent in the potential. This holds true regardless of the steepness of the potential or the smallness of the coupling constant. For matter-coupled scalar fields, the asymptotics are obtained for a large class of positive potentials, generalizing the well-known cosmic no-hair theorems for minimal coupling. In this case it is observed that the direct coupling to matter does not impact the late-time dynamics essentially.

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Language(s): eng - English
 Dates: 2006
 Publication Status: Published in print
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 Identifiers: eDoc: 281822
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Title: Classical and Quantum Gravity
Source Genre: Journal
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Pages: - Volume / Issue: 23 Sequence Number: - Start / End Page: 5983 - 5995 Identifier: -