HIGHER-LOOP STRING COSMOLOGY WITH MODULI AND ANTISYMMETRIC TENSOR FIELD

The classical evolution of a homogeneous cosmological model is investi gated within the framework of low-energy effective string gravity with higher-genus corrections. Various conformal frames are considered. Fo r the general case of correction functions in the Lagrangian we derive the cosmological solutions with arbitrary curvature and dilaton, modu lus and Kalb-Ramond fields. These solutions are given in closed form i n terms of integrations depending on dilaton coupling functions and ge neralize previously known tree-level solutions. The features of the so lutions are discussed.