| Cosmological D-instantons and Cyclic Universes (2005) | |||||||||
Abstract | |||||||||
| For models of gravity coupled to hyperbolic sigma models, such as the metric-scalar sector of IIB supergravity, we show how smooth trajectories in the `augmented target space' connect FLRW cosmologies to non-extremal D-instantons through a cosmological singularity. In particular, we find closed cyclic universes that undergo an endless sequence of big-bang to big-crunch cycles separated by instanton `phases'. We also find `big-bounce' universes in which a collapsing closed universe bounces off its cosmological singularity to become an open expanding universe.. Comment: 21 pages, 4 figures. v2: minor changes | |||||||||
Publication details | |||||||||
| |||||||||