Cosmology at the top of the $\alpha'$ tower
Abstract
The cosmology of the fully -corrected duality-invariant action for the Neveu-Schwarz sector of string theory is revisited, with special emphasis on its coupling to matter sources. The role of the duality covariant pressure and dilatonic charge of the matter sector is explored in various contexts, from the low-curvature regime to non-perturbative solutions in . We comment on how an infinite tower of corrections allows for fixed-dilaton de Sitter solutions, even in vacuum. We further investigate the necessary conditions for accelerated expansion in the Einstein frame, as well as for non-singular bounces that could resolve the big bang singularity. In particular, explicit examples are constructed, which show that the tower of corrections may support an Einstein-frame non-singular cosmological bouncing background, even when the matter sector respects the null energy condition.
Keywords
Cite
@article{arxiv.2105.01083,
title = {Cosmology at the top of the $\alpha'$ tower},
author = {Jerome Quintin and Heliudson Bernardo and Guilherme Franzmann},
journal= {arXiv preprint arXiv:2105.01083},
year = {2021}
}
Comments
37 pages, 5 figures; v2: minor changes, references added; v3: minor changes, matches published version