No accelerating scaling cosmologies at string tree level?
High Energy Physics - Theory
2024-01-09 v4 General Relativity and Quantum Cosmology
Abstract
We investigate the scalar potential of string compactifications in the parametric regime where string loops and higher derivative corrections to 10d supergravity can be ignored and where the fields are rolling down exponential slopes leading to powerlaw FLRW cosmologies, aka scaling solutions. We argue that these scaling solutions, if describing an accelerating expansion, are likely to be perturbatively unstable, for reasons identical to the perturbative instabilities in tree-level dS vacua.
Keywords
Cite
@article{arxiv.2308.15035,
title = {No accelerating scaling cosmologies at string tree level?},
author = {Thomas Van Riet},
journal= {arXiv preprint arXiv:2308.15035},
year = {2024}
}
Comments
short note, 12 pages including references; v2 footnote and 3 references added; v3 2 more refs; v4 few typos corrected, ref added, version accepted in JCAP