Bouncing and Accelerating Solutions in Nonlocal Stringy Models
High Energy Physics - Theory
2008-11-26 v4 Astrophysics
General Relativity and Quantum Cosmology
Abstract
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.
Cite
@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}
}
Comments
Minor corrections, references added, published in JHEP