Stability conditions for the Bianchi type II anisotropically inflating universes

W. F. Kao, Ing Chen Lin

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12 Scopus citations


Stability conditions for a class of anisotropically inflating solutions in the Bianchi type II background space are shown explicitly in this paper. These inflating solutions were known to break the cosmic no-hair theorem such that they do not approach the de Sitter universe at large times. It can be shown that unstable modes of the anisotropic perturbations always exist for this class of expanding solutions. As a result, we show that these set of anisotropically expanding solutions are unstable against anisotropic perturbations in the Bianchi type II space.

Original languageEnglish
Article number022
JournalJournal of Cosmology and Astroparticle Physics
Issue number1
StatePublished - 25 Mar 2009


  • Cosmological perturbation theory
  • Physics of the early universe

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