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We investigate the possibility of a dark energy universe emerging from anaction with higher-order string loop corrections to Einstein gravity in thepresence of a massless dilaton. These curvature corrections (up to $R^4$ order)are different depending upon the type of (super)string model which isconsidered. We find in fact that Type II, heterotic, and bosonic stringsrespond differently to dark energy. A dark energy solution is shown to exist inthe case of the bosonic string, while the other two theories do not lead torealistic dark energy universes. Detailed analysis of the dynamical stabilityof the de-Sitter solution is presented for the case of a bosonic string. Ageneral prescription for the construction of a de-Sitter solution for thelow-energy (super)string effective action is also indicated. Beyond thelow-energy (super)string effective action, when the higher-curvature correctioncoefficients depend on the dilaton, the reconstruction of the theory from theuniverse expansion history is done with a corresponding prescription for thescalar potentials.

Dark energy generated from a (super)string effective action with higher order curvature corrections and a dynamical dilaton