On Time-dependent Backgrounds in Supergravity and String Theory
High Energy Physics - Theory
2009-11-07 v2
Abstract
Time-dependent solutions of supergravity and string theory are studied. The examples are obtained from de Sitter deformation of gauge/gravity dualities, analytical continuation of static solutions, and ``exactly solvable'' worldsheet models. Among other things, it is shown that turning on a Hubble parameter in the background of a confining gauge theory in four dimensions can restore chiral symmetry. Some of the solutions obtained from analytical continuation have the interpretation of a universe with a bounce separating a big bang from a big crunch singularity. In the worldsheet context, it is argued why string propagation close to a Milne-type cosmological singularity might be physically non-singular.
Cite
@article{arxiv.hep-th/0207214,
title = {On Time-dependent Backgrounds in Supergravity and String Theory},
author = {Alex Buchel and Peter Langfelder and Johannes Walcher},
journal= {arXiv preprint arXiv:hep-th/0207214},
year = {2009}
}
Comments
38 pages, 1 figure, v2: refs added