Classical and quantum (2+1)-dimensional spatially homogeneous string cosmology

We introduce three families of classical and quantum solutions to the leading order of string effective action on spatially homogeneous $(2+1)$-dimensional space-times with the sources given by the contributions of dilaton, antisymmetric gauge $B$-field, and central charge deficit term $Lambda$. At the quantum level, solutions of Wheeler-DeWitt equations have been enriched by considering the quant