Cosmological evolution on self-tuned branes and the cosmological constant

Authors
Citation
P. Brax et Ac. Davis, Cosmological evolution on self-tuned branes and the cosmological constant, J HIGH EN P, 2001(5), 2001, pp. NIL_145-NIL_169
Citations number
41
Categorie Soggetti
Physics
Journal title
JOURNAL OF HIGH ENERGY PHYSICS
ISSN journal
10298479 → ACNP
Volume
2001
Issue
5
Year of publication
2001
Pages
NIL_145 - NIL_169
Database
ISI
SICI code
1029-8479(200105)2001:5<NIL_145:CEOSBA>2.0.ZU;2-X
Abstract
We consider the cosmological evolution of a bulk scalar field and ordinary matter living on the brane world in the light of the constraints imposed by the matter dominated cosmological evolution and a small cosmological const ant now. We rule out models with a self-tuned minimum of the four dimension al potential as they would lead to rapid oscillations of the Hubble paramet er now. A more natural framework is provided by supergravity in singular sp aces where the brane coupling and the bulk potential are related by supersy mmetry, leading to a four dimensional run-away potential. For late times we obtain an accelerating universe due to the breaking of supersymmetry on th e brane with an acceleration parameter of q(0) = -4/7 and associated equati on of state omega = 5/7.