LONG-WAVELENGTH ITERATION SCHEME AND SCALAR-TENSOR GRAVITY

Inhomogeneous and anisotropic cosmologies are modeled within the frame work of scalar-tensor gravity theories. The inhomogeneities are calcul ated to third order in the so-called long-wavelength iteration scheme. We write the solutions for general scalar coupling and discuss what h appens to the third-order terms when the scalar-tensor solution approa ches at first order the general relativistic one. We work out in some detail the case of Brans-Dicke coupling and determine the conditions f or which the anisotropy and inhomogeneity decay as time increases. The matter is taken to be that of perfect fluid with a baryotropic equati on of state.