\$tring Theory and an Accelerating Universe
Abstract
An accelerating Universe can be accommodated naturally within non-critical string theory, in which scattering is described by a superscattering matrix $ that does not factorize as a product of - and -matrix elements and time evolution is described by a modified Liouville equation characteristic of open quantum-mechanical systems. We describe briefly alternative representations in terms of the stochastic Ito and Fokker-Planck equations. The link between the vacuum energy and the departure from criticality is stressed. We give an explicit example in which non-marginal $tring couplings cause a departure from criticality, and the corresponding cosmological vacuum energy relaxes to zero \`a la quintessence.
Cite
@article{arxiv.hep-th/0105206,
title = {\$tring Theory and an Accelerating Universe},
author = {John Ellis and N. E. Mavromatos and D. V. Nanopoulos},
journal= {arXiv preprint arXiv:hep-th/0105206},
year = {2007}
}
Comments
11 pages LATEX, one eps figure incorporated