Polarizable vacuum approach for describing of gravitation induced optical effects

The Maxwell equations with accounting for tensors properties of time have been considered. It has been demonstrated that introduction of the time tensor enables describing the changes in the velocities of electromagnetic waves in the so-called polarized vacuum, as well as anisotropy of those velocities. We have analyzed the propagation of light near a electrically charged, static spherical mass. The relations that describe the changes in the refractive index, dielectric impermeability and polarizability of vacuum under the influence of gravitation and electrical fields have been derived. One can see that vacuum possess polarizability and last is equal zero only at anyone field absence that is impossible in reality. Hence we have good reasons to conclude: vacuum is polarizable medium.