Cosmologies from higher-order string corrections
Abstract
We study cosmologies based on low-energy effective string theory with higher-order string corrections to a tree-level action and with a modulus scalar field (dilaton or compactification modulus). In the presence of such corrections it is possible to construct nonsingular cosmological solutions in the context of Pre-Big-Bang and Ekpyrotic universes. We review the construction of nonsingular bouncing solutions and resulting density perturbations in Pre-Big-Bang and Ekpyrotic models. We also discuss the effect of higher-order string corrections on dark energy universe and show several interesting possibilities of the avoidance of future singularities.
Cite
@article{arxiv.hep-th/0606040,
title = {Cosmologies from higher-order string corrections},
author = {Shinji Tsujikawa},
journal= {arXiv preprint arXiv:hep-th/0606040},
year = {2009}
}
Comments
15 pages, 2 figures, References are added, plenary talk at Pomeranian Workshop in Fundamental Cosmology (COSMOFUN 05), Pobierowo, Poland, 1-6 September 2005