DESY - Institut für Hochenergiephysik, Zeuthen, Germany
Humboldt-Universität, Berlin, Germany
Abstract:
We obtain cosmological four dimensional solutions of the low energy effective string theory by reducing a five dimensional black hole, and black hole-de Sitter solution of Einstein gravity down to four dimensions. The appearance of a cosmological constant in the five dimensional Einstein-Hilbert action produces special dilation potential in the four dimensional effective string action. Cosmological scenarios implemented by our solutions are discussed.