Classical Inhomogeneities in String Cosmology
摘要
We generalize previous work on inhomogeneous pre-big bang cosmology by including the effect of non-trivial moduli and antisymmetric-tensor/axion fields. The general quasi-homogeneous asymptotic solution---as one approaches the big bang singularity from perturbative initial data---is given and its range of validity is discussed, allowing us to give a general quantitative estimate of the amount of inflation obtained during the perturbative pre-big bang era. The question of determining early-time ``attractors'' for generic pre-big bang cosmologies is also addressed, and a motivated conjecture is advanced. We also discuss S-duality-related features of the solutions, and speculate on the way an asymptotic T-duality symmetry may act on moduli space as one approaches the big bang.
引用
@article{arxiv.hep-th/9706221,
title = {Classical Inhomogeneities in String Cosmology},
author = {A. Buonanno and K. A. Meissner and C. Ungarelli and G. Veneziano},
journal= {arXiv preprint arXiv:hep-th/9706221},
year = {2009}
}
备注
32 pages, Revtex, 1 figure included, epsfig.sty needed; one reference added