We derive and study a class of cosmological and wormhole solutions of low-energy effective string field theory. We consider a general four-dimensional string effective action where moduli of the compactified manifold and the electromagnetic field are present. The cosmological solutions of the two-dimensional effective theory obtained by dimensional reduction of the former are discussed. In particular we demonstrate that the two-dimensional theory possesses a scale-factor duality invariance. Eucidean four-dimensional instantons describing the nucleation of the baby universes are found and the probability amplitude for the nucleation process given.
M. Cadoni and M. Cavaglia, "Cosmological and Wormhole Solutions in Low-Energy Effective String Theory," Physical Review D, vol. 50, no. 10, pp. 6435-6443, American Physical Society (APS), Nov 1994.
The definitive version is available at https://doi.org/10.1103/PhysRevD.50.6435
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