An alternative approach to tachyon cosmology
| dc.creator | Ward, John | |
| dc.date | 2008-12-31 | |
| dc.date | 2009-02-23 | |
| dc.date.accessioned | 2026-07-07T12:44:52Z | |
| dc.date.available | 2026-07-07T12:44:52Z | |
| dc.description | In this note we propose the use of an alternate action for the open string tachyon on a non-BPS $D3$-brane. At the classical level this action is precisely equivalent to the more commonly used DBI action, but involves an additional coupling to dynamical world-volume gravity. We find that, for a FRW metric, exponential expansion occurs provided that the cosmological constant is positive. For anti de-Sitter solutions we find a periodically bouncing universe, and there are no accelerating trajectories for a theory with no cosmological constant. In specific cases the acceleration is terminated by the condensation of the open string tachyon, leading to a canonical inflationary trajectory at late times. | |
| dc.description | 5 pages. References added | |
| dc.identifier | https://arxiv.org/abs/0901.0080 | |
| dc.identifier | http://arxiv.org/abs/0901.0080 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/220920 | |
| dc.subject | General Relativity and Quantum Cosmology | |
| dc.subject | Cosmology and Nongalactic Astrophysics | |
| dc.title | An alternative approach to tachyon cosmology | |
| dc.type | text |