Abstract
Two exact cosmological solutions to a scalar-field potential motivated by six-dimensional (6D) Einstein-Maxwell theory are given. The resulting pure scalar-field cosmology is free of singularity and causality problems but conserves entropy. These solutions are then extended into exact cosmological solutions for a decaying scalar field with an approximate two-loop 4D string potential. The resulting cosmology is, for both solutiosn, free of cosmological problems and close to the standard cosmology of the radiation era.
- Received 12 December 1991
DOI:https://doi.org/10.1103/PhysRevD.45.R997
©1992 American Physical Society