U. Kasper et al., INTEGRABLE MULTICOMPONENT PERFECT FLUID MULTIDIMENSIONAL COSMOLOGY .2. SCALAR FIELDS, General relativity and gravitation, 29(9), 1997, pp. 1123-1162
We consider anisotropic cosmological models with a universe of dimensi
on 4 or higher, factorized into n greater than or equal to 2 Ricci-fla
t spaces, containing an m-component perfect fluid of m non-interacting
homogeneous minimally coupled scalar fields under special conditions.
We describe the dynamics of the universe: It has a Kasner-like behavi
our near the singularity and isotropizes during the expansion to infin
ity. Some of the models considered are integrable, and classical as we
ll as quantum solutions are found. Some solutions produce inflation fr
om ''nothing''. There exist classical asymptotically anti-de Sitter wo
rmholes, and quantum wormholes with discrete spectrum.