Bouncing and Accelerating Solutions in Nonlocal Stringy Models
高能物理 - 理论
2008-11-26 v4 天体物理学
广义相对论与量子宇宙学
摘要
A general class of cosmological models driven by a non-local scalar field inspired by string field theories is studied. In particular cases the scalar field is a string dilaton or a string tachyon. A distinguished feature of these models is a crossing of the phantom divide. We reveal the nature of this phenomena showing that it is caused by an equivalence of the initial non-local model to a model with an infinite number of local fields some of which are ghosts. Deformations of the model that admit exact solutions are constructed. These deformations contain locking potentials that stabilize solutions. Bouncing and accelerating solutions are presented.
引用
@article{arxiv.hep-th/0701184,
title = {Bouncing and Accelerating Solutions in Nonlocal Stringy Models},
author = {I. Ya. Aref'eva and L. V. Joukovskaya and S. Yu. Vernov},
journal= {arXiv preprint arXiv:hep-th/0701184},
year = {2008}
}
备注
Minor corrections, references added, published in JHEP