On string cosmology with a dilaton potential. II

Investigations of string cosmology with a nonperturbative dilaton potential, begun in the first part of this work, are continued. The picture of cosmological evolution of an isotropic, gravi-dilaton model for different cases of the behavior of the potential in the region of strong coupling is analyzed by methods of the qualitative theory of dynamical systems. Features of models with potentials that take negative values in certain ranges of values of the dilaton field are discussed. A specific mechanism of generation of the nonperturbative potential, based on gaugino condensation in a hidden sector of the gauge group, is considered. Translated from Astrofizika, Vol. 40, No. 4, pp. 517–534, October-December, 1997.