Tensor perturbations in high-curvature string backgrounds
General Relativity and Quantum Cosmology
2009-10-30 v1 High Energy Physics - Phenomenology
High Energy Physics - Theory
Abstract
We derive a generalized equation for the evolution of tensor perturbations in a cosmological background, taking into account higher-curvature contributions and a tree-level coupling to the dilaton in the string frame. The equation is obtained by perturbing the gravi-dilaton string effective action, expanded up to first order in . The corrections can modify the low-energy perturbation spectrum, but the modifications are shown to be small when the background curvature keeps constant in the string frame.
Cite
@article{arxiv.gr-qc/9704045,
title = {Tensor perturbations in high-curvature string backgrounds},
author = {M. Gasperini},
journal= {arXiv preprint arXiv:gr-qc/9704045},
year = {2009}
}
Comments
9 pages, REVTEX, three figures included using EPSFIG. An updated collection of papers on the pre-big bang scenario in string cosmology is a available at http://www.to.infn.it/teorici/gasperini