Expanding and Contracting Universes in Third Quantized String Cosmology


(a)(b) and C. Ungarelli (a)(b) (a) Abstract We discuss the possibility of quantum transitions from the string perturbative vacuum to cosmological conngurations characterized by isotropic contraction and decreasing dilaton. When the dilaton potential preserves the sign of the Hubble factor throughout the evolution, such transitions can be represented as an… (More)


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