On the initial singularity in the scalar-tensor anisotropic cosmology

In connection with the problem of the initial singularity in the scalar-tensor anisotropic cosmology of Jordan-Brans-Dicke, the dynamics of homogeneous models of Bianchi type I is examined on the basis of the general analytic solutions in vacuo and in the presence of gravitating matter with state equations P = nepsilon (0 <= n <= 1). It is shown that the scalar homogeneous phi-field, as an effective source of the V4-geometry, has to influence essentially the dynamics of the early anisotropic stage of the Universe's expansion, and significantly modifies the character of the initial singularity. At negative ω (ω < -6), the sourceless scalar phi -field may remove the singularity and provide regular 'bouncing' in the models with matter (P <= epsilon/3) if it prevails over the tensor anisotropic mode of the vacuum gravitational field. (author)