Perturbations in a non-singular bouncing Universe
arXiv:hep-th/0306113 · doi:10.1016/j.physletb.2003.07.028
Abstract
We complement the low-energy gravi-dilaton effective action of string theory with a non-local, general-covariant dilaton potential, and obtain homogeneous solutions describing a non-singular (bouncing-curvature) cosmology. We then compute, both analytically and numerically, the spectrum of amplified scalar and tensor perturbations, and draw some general lessons on how to extract observable consequences from pre-big bang and ekpyrotic scenarios.
14 pages in Latex style, 5 included figures