Billiard representation for multidimensional multi-scalar cosmological model with exponential potentials

Multidimensional cosmological-type model with n Einstein factor spaces in the theory with l scalar fields and multiple exponential potential is considered. The dynamics of the model near the singularity is reduced to a billiard on the (N − 1)-dimensional Lobachevsky space HN−1, N = n + l. It is shown that for n > 1 the oscillating behaviour near the singularity is absent and solutions have an asymptotical Kasner-like behavior. For the case of one scale factor (n = 1) billiards with finite volumes (e.g. coinciding with that of the BianchiIX model) are described and oscillating behaviour of scalar fields near the singularity is obtained. PACS number(s): 04.50.+h, 98.80.Hw, [email protected] [email protected] [email protected]