Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2000-03-07
Phys.Rev. D62 (2000) 043501
Physics
High Energy Physics
High Energy Physics - Theory
LaTeX, 27 pages, 2 .eps figures. v2: factors of i in final result and references added. v3: Appendix A and typos corrected and
Scientific paper
10.1103/PhysRevD.62.043501
We study a Randall-Sundrum cosmological scenario consisting of a domain wall in anti-de Sitter space with a strongly coupled large $N$ conformal field theory living on the wall. The AdS/CFT correspondence allows a fully quantum mechanical treatment of this CFT, in contrast with the usual treatment of matter fields in inflationary cosmology. The conformal anomaly of the CFT provides an effective tension which leads to a de Sitter geometry for the domain wall. This is the analogue of Starobinsky's four dimensional model of anomaly driven inflation. Studying this model in a Euclidean setting gives a natural choice of boundary conditions at the horizon. We calculate the graviton correlator using the Hartle-Hawking ``No Boundary'' proposal and analytically continue to Lorentzian signature. We find that the CFT strongly suppresses metric perturbations on all but the largest angular scales. This is true independently of how the de Sitter geometry arises, i.e., it is also true for four dimensional Einstein gravity. Since generic matter would be expected to behave like a CFT on small scales, our results suggest that tensor perturbations on small scales are far smaller than predicted by all previous calculations, which have neglected the effects of matter on tensor perturbations.
Hawking Stephen W.
Hertog Thomas
Reall Harvey S.
No associations
LandOfFree
Brane New World does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Brane New World, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Brane New World will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-305367