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          Institute: MPI für Gravitationsphysik     Collection: Geometric Analysis and Gravitation     Display Documents



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ID: 359633.0, MPI für Gravitationsphysik / Geometric Analysis and Gravitation
Isotropization in the approach to big rip singularities for Cardassian models
Authors:Berndt, Nikolaus; Rendall, Alan D.
Date of Publication (YYYY-MM-DD):2008-07
Title of Journal:Classical and Quantum Gravity
Volume:25
Issue / Number:14
Sequence Number of Article:145007
Review Status:not specified
Audience:Not Specified
Abstract / Description: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.
External Publication Status:published
Document Type:Article
Communicated by:Gerhard Huisken
Affiliations:MPI für Gravitationsphysik/Geometric Analysis and Gravitation
Identifiers:LOCALID:arXiv:0804.3693
URL:http://arxiv.org/abs/0804.3693
DOI:10.1088/0264-9381/25/14/145007
URL:http://www.iop.org/EJ/abstract/0264-9381/25/14/145...
ISSN:1361-6447
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0804.3693v1.pdf  [185,00 Kb] [Comment:arXiv:0804.3693v1 [gr-qc]]  
 
cqg8_14_145007.pdf  [161,00 Kb] [Comment:Online Journal]  
 
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