Null Energy Condition Violation and Classical Stability in the Bianchi I Metric

Details Null Energy Condition Violation and Classical Stability in the Bianchi I Metric Null Energy Condition Violation and Classical Stability in the Bianchi I Metric

2009-03-30

arxiv.org/abs/0903.5264v3

Phys.Rev.D80:083532,2009

Physics

High Energy Physics

High Energy Physics - Theory

27 pages, references added, accepted for publication in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.80.083532

The stability of isotropic cosmological solutions in the Bianchi I model is considered. We prove that the stability of isotropic solutions in the Bianchi I metric for a positive Hubble parameter follows from their stability in the Friedmann-Robertson-Walker metric. This result is applied to models inspired by string field theory, which violate the null energy condition. Examples of stable isotropic solutions are presented. We also consider the k-essence model and analyse the stability of solutions of the form $\Phi(t)=t$.

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