Quantum isotropization of the Universe

We consider minisuperspace models constituted of Bianchi I geometries with a free massless scalar field. The Wheeler-DeWitt equation is a four-dimensi onal massless Klein-Gordon equation and there are plenty of quantum states whose corresponding Bohmian trajectories may be non-singular and/or present ing large isotropic phases, even if they begin anisotropic, due to quantum gravitational effects. (C) 2000 Elsevier Science B.V. All rights reserved.