Singularity and exit problems in two-dimensional string cosmology
高能物理 - 理论
2011-07-19 v1 广义相对论与量子宇宙学
摘要
A broad class of two-dimensional loop-corrected dilaton gravity models exhibit cosmological solutions that interpolate between the string perturbative vacuum and a background with asymptotically flat metric and linearly growing dilaton. The curvature singularities of the corresponding tree-level solutions are smoothed out, but no branch-change occurs. Thus, even in the presence of a non-perturbative potential, the system is not attracted by physically interesting fixed points with constant dilaton, and the exit problem of string cosmology persists.
引用
@article{arxiv.hep-th/9607126,
title = {Singularity and exit problems in two-dimensional string cosmology},
author = {M. Gasperini and G. Veneziano},
journal= {arXiv preprint arXiv:hep-th/9607126},
year = {2011}
}
备注
11 pages, LATEX, one figure included using epsf. See also http://www.to.infn.it/teorici/gasperini/