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  Isotropization in the approach to big rip singularities for Cardassian models

Berndt, N., & Rendall, A. D. (2008). Isotropization in the approach to big rip singularities for Cardassian models. Classical and Quantum Gravity, 25(14): 145007. doi:10.1088/0264-9381/25/14/145007.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-6296-D Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-6297-B
Genre: Journal Article

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cqg8_14_145007.pdf (Publisher version), 159KB
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Berndt, Nikolaus1, Author
Rendall, Alan D.2, Author
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1External Organizations, , , escidoc:persistent22              
2Geometric Analysis and Gravitation, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, Golm, DE, escidoc:24012              

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 Abstract: Cardassian models are an alternative to general relativity which have been proposed as an approach to explaining accelerated cosmic expansion while avoiding directly introducing dark energy. They are generally formulated only in the homogeneous and isotropic case. In this paper an extension of the usual formulation to general spatially homogeneous geometries is given. A characteristic feature of many classes of Cardassian models is the occurrence of big rip singularities where the scale factor tends to infinity after a finite time. It is shown that big rip singularities are also widespread in more general homogeneous cases. It is also shown that there is isotropization in the approach to a big rip singularity which bears a strong resemblance to the late-time isotropization observed in cosmological spacetimes which accelerate forever in the future.

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 Dates: 2008-07-21
 Publication Status: Published in print
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 Identifiers: DOI: 10.1088/0264-9381/25/14/145007
eDoc: 359633
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Title: Classical and Quantum Gravity
Source Genre: Journal
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Pages: - Volume / Issue: 25 (14) Sequence Number: 145007 Start / End Page: - Identifier: ISSN: 0264-9381