Tracking Quintessence Would Require Two Cosmic Coincidences
| dc.creator | Bludman, Sidney | |
| dc.date | 2004-03-22 | |
| dc.date.accessioned | 2026-07-07T13:02:32Z | |
| dc.date.available | 2026-07-07T13:02:32Z | |
| dc.description | Good tracking requires that the quintessence energy fraction slowly increase while the roll $λ\equiv -d\ln V/\varkappa dϕ$ slowly decreases, but is not yet truly slow-rolling. The supernova bound on the present quintessence equation of state requires either (1) a cosmological constant or other fine-tuned "crawling quintessence" or (2) "roll-over quintessence" that tracked until recently, but now became slow rolling, because of a sharp increase in potential curvature. Thus, fine-tuning is required by constant equation of state and inverse power potentials, but can be avoided by the SUGRA and Skordis-Albrecht potentials and other good trackers, provided quintessence energy domination and slow roll {\em both} began only recently. This makes the time in which we live special in {\em two} respects. | |
| dc.description | 10 pages, including 2 figures, 3 tables | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0403526 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0403526 | |
| dc.identifier | Phys.Rev.D69:122002,2004 | |
| dc.identifier | doi:10.1103/PhysRevD.69.122002 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/226478 | |
| dc.subject | Astrophysics | |
| dc.title | Tracking Quintessence Would Require Two Cosmic Coincidences | |
| dc.type | text |