Cascading gravity: extending the Dvali-Gabadadze-Porrati model to higher dimension.
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.
de Rham
Claudia
C
Perimeter Institute for Theoretical Physics, 31 Caroline St. N., Waterloo, ON, N2L 2Y5, Canada.
Dvali
Gia
G
Hofmann
Stefan
S
Khoury
Justin
J
Pujolàs
Oriol
O
Redi
Michele
M
Tolley
Andrew J
AJ