Bouncing Universes in String-inspired Gravity
arXiv:hep-th/0508194 · doi:10.1088/1475-7516/2006/03/009
Abstract
We consider the effects on cosmology of higher-derivative modifications of (effective) gravity that make it asymptotically free without introducing ghosts. The weakening of gravity at short distances allows pressure to prevent the singularity, producing a solution with contraction preceding expansion.
28 pages, 2 figures; v2: added references