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Singularities and isotropy in a Brans-Dicke Bianchi-type VII universe | H. N. Nú~nez-Yépez
; | Date: |
2 Oct 1998 | Subject: | gr-qc | Abstract: | We study the dynamical effects in the scale factors due to the scalar $phi$-field at the early stages of a supposedly anisotropic Universe expansion in connection with the problem of the initial singularity in the scalar-tensor cosmology of Jordan-Brans-Dicke. This is done by considering the behaviour of the general analytical solutions for the homogeneous model of Bianchi type VII in the vacuum case. We conclude that the Bianchi-VII$_0$ model shows an isotropic expansion and that its only physical solution is equivalent to a Friedman-Robertson-Walker spacetime whose evolution begins in a singularity and ends in another; moreover, we obtain that the general Bianchi-VII$_h$ (with $h
eq 0$) models show strong curvature singularities that produces a complete collapse of the homogeinity surfaces to a 2-plane, to a string-like one-dimensional manifold, or to a single point. | Source: | arXiv, gr-qc/9810008 | Services: | Forum | Review | PDF | Favorites |
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