Anisotropically inflating universes in a scalar-tensor theory

Details Anisotropically inflating universes in a scalar-tensor theory Anisotropically inflating universes in a scalar-tensor theory

Feb 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009phrvd..79d3001k&link_type=abstract

Physical Review D, vol. 79, Issue 4, id. 043001

Physics

4

Relativity And Gravitation, Modified Theories Of Gravity, Origin And Formation Of The Universe, Mathematical And Relativistic Aspects Of Cosmology

Scientific paper

We show that a Brans-Dicke model admits some anisotropically inflating solutions which are identical to the solutions found in a higher derivative pure gravity theory. These inflating solutions were shown to break the cosmic no-hair theorem such that they do not approach the de Sitter universe at large times. The stability conditions of these solutions in this scalar-tensor theory are shown explicitly in this paper. It is shown that there exist unstable modes of the anisotropic perturbations. Therefore the inflating solutions are unstable in the scalar-tensor theory.

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