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=n? (0 ? n ? 1). It is shown that the scalar homogeneous ?-field, as an effective source of the V₄geometry, 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 ?-field may remove the singularity and provide regular ‘bouncing’ in the models with matter (P ? ?/3) if it prevails over the tensor anisotropic mode of the vacuum gravitational field.