  Minisuperspace models derived from Kaluza-Klein theories and low energy
string theory are studied. They are equivalent to one and two minimally coupled
scalar fields. The general classical and quantum solutions are obtained.
Gaussian superposition of WKB solutions are constructed. Contrarily to what is
usually expected, these states are sharply peaked around the classical
trajectories only for small values of the scale factor. This behaviour is
confirmed in the framework of the causal interpretation: the Bohmian
trajectories of many quantum states are classical for small values of the scale
factor but present quantum behaviour when the scale factor becomes large. A
consequence of this fact is that these states present an initial singularity.
However, there are some particular superpositions of these wave functions which
have Bohmian trajectories without singularities. There are also singular
Bohmian trajectories with a short period of inflation which grow forever. We
could not find any non-singular trajectory which grows to the size of our
universe.
