Null Energy Condition Violation and Classical Stability in the Bianchi I Metric
High Energy Physics - Theory
2009-11-05 v3 Cosmology and Nongalactic Astrophysics
General Relativity and Quantum Cosmology
Mathematical Physics
math.MP
Abstract
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 .
Keywords
Cite
@article{arxiv.0903.5264,
title = {Null Energy Condition Violation and Classical Stability in the Bianchi I Metric},
author = {Irina Ya. Aref'eva and Nikolay V. Bulatov and Liudmila V. Joukovskaya and Sergey Yu. Vernov},
journal= {arXiv preprint arXiv:0903.5264},
year = {2009}
}
Comments
27 pages, references added, accepted for publication in Phys. Rev. D