Clarifying perturbations in the ekpyrotic universe
High Energy Physics - Theory
2007-05-23 v2 Astrophysics
Abstract
In this note I try to clarify the problem of perturbations in the ekpyrotic universe. I write down the most general matching conditions and specify the choices taken by the two debating sides. I also bring up the problem of surface stresses which always have to be present when a transition from a collapsing to an expanding phase is made.
Cite
@article{arxiv.hep-th/0112026,
title = {Clarifying perturbations in the ekpyrotic universe},
author = {Ruth Durrer},
journal= {arXiv preprint arXiv:hep-th/0112026},
year = {2007}
}
Comments
3 pages, no figures Some typo's and a conceptial mistake corrected. Conclusions unaltered