The initial fate of an anisotropic JBD universe

Details The initial fate of an anisotropic JBD universe The initial fate of an anisotropic JBD universe

1999-08-19

arxiv.org/abs/gr-qc/9908053v1

Phys.Lett. A258 (1999) 210-216

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Scientific paper

10.1016/S0375-9601(99)00357-6

The dynamical effects on the scale factors due to the scalar $\phi$-field at the early stages of a supposedly anisotropic Universe expansion in the scalar-tensor cosmology of Jordan-Brans and Dicke is studied. This universe shows an {\sl isotropic} evolution and, depending on the value of the theorie's coupling parameter $\omega$, it can begin from a singularity if $\omega>0$ and after expanding shrink to another one; or, if $\omega <0$ and $-3/2< \omega\leq -4/3$, it can evolve from a flat spatially-infinite state to a non extended singularity; or, if $ -4/3 < \omega < 0$, evolve from an extended singularity to a non singular state and, at last, proceed towards a singularity.

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