IS THERE GR IN THE BIMETRIC SCALAR-TENSOR THEORY OF GRAVITATION

A theory of gravitation with a flat background metric and a dynamical variable phi (variable gravitational constant) is investigated. It is shown that such bimetric scalar-tensor theory (BSTT) generalized GR as all the solutions of GR equations and phi(x) = constant satisfy BSTT equations, firstly, and BSTT equations contain non-Einstein solutions with the variable phi, secondly. Due to this fact, the problem on the agreement of BSTT with the observational data is reduced to the proble m on the agreement of GR with the observational data and to the interp retation of the solutions with the variable phi. The latter may prove useful for the prediction of new effects. Examples of such effects are discussed.