Abstract
The scenario that the Universe contracts towards a big crunch and then undergoes a transition to an expanding universe is envisaged in the quantum string cosmology approach. The Wheeler-DeWitt (WDW) equation is solved exactly for an exponential dilaton potential. An S-duality invariant cosmological effective action for type IIB theory is considered to derive classical solutions and solve WDW equations.
- Received 2 November 2001
DOI:https://doi.org/10.1103/PhysRevD.65.103504
©2002 American Physical Society
