The initial fate of an anisotropic JBD universe

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 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 less than or equal to - 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. (C) 1999 Published by Elsevier Science B.V. All rights reserved.