title: Cascading gravity: extending the Dvali-Gabadadze-Porrati model to higher dimension.
abstract: We present a generalization of the Dvali-Gabadadze-Porrati scenario to higher codimensions which, unlike previous attempts, is free of ghost instabilities. The 4D propagator is made regular by embedding our visible 3-brane within a 4-brane, each with their own induced gravity terms, in a flat 6D bulk. The model is ghost-free if the tension on the 3-brane is larger than a certain critical value, while the induced metric remains flat. The gravitational force law "cascades" from a 6D behavior at the largest distances followed by a 5D and finally a 4D regime at the shortest scales.
authors.affiliation: Perimeter Institute for Theoretical Physics, 31 Caroline St. N., Waterloo, ON, N2L 2Y5, Canada.
authors.forename: Claudia
authors.initials: C
authors.lastname: de Rham
authors.forename: Gia
authors.initials: G
authors.lastname: Dvali
authors.forename: Stefan
authors.initials: S
authors.lastname: Hofmann
authors.forename: Justin
authors.initials: J
authors.lastname: Khoury
authors.forename: Oriol
authors.initials: O
authors.lastname: Pujolàs
authors.forename: Michele
authors.initials: M
authors.lastname: Redi
authors.forename: Andrew J
authors.initials: AJ
authors.lastname: Tolley