Einstein and Brans-Dicke frames in multidimensional cosmology

Details Einstein and Brans-Dicke frames in multidimensional cosmology Einstein and Brans-Dicke frames in multidimensional cosmology

1998-08-26

arxiv.org/abs/gr-qc/9808073v1

Gen.Rel.Grav. 32 (2000) 79-104

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

27 pages, Revtex

Scientific paper

Inhomogeneous multidimensional cosmological models with a higher dimensional space-time manifold M= M_0 x M_1 ...x M_n are investigated under dimensional reduction to a D_0-dimensional effective non-minimally coupled sigma-model which generalizes the familiar Brans-Dicke model. It is argued that the Einstein frame should be considered as the physical one. The general prescription for the Einstein frame reformulation of known solutions in the Brans-Dicke frame is given. As an example, the reformulation is demonstrated explicitly for the generalized Kasner solutions where it is shown that in the Einstein frame there are no solutions with inflation of the external space.

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