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Cascading Gravity and Degravitation
Claudia de Rham, Stefan Hofmann, Justin Khoury +1
We construct a cascading brane model of gravity in which the behavior of the gravitational force law interpolates from (n+4)-dimensional to (n+3)-dimensional all the way down to 4-…
Cascading DGP
Claudia de Rham, Gia Dvali, Stefan Hofmann +4
We present a higher codimension generalization of the DGP scenario which, unlike previous attempts, is free of ghost instabilities. The 4D propagator is made regular by embedding o…
Enhanced Non-Gaussianity from Excited Initial States
R. Holman, Andrew J. Tolley
We use the techniques of effective field theory in an expanding universe to examine the effect of choosing an excited inflationary initial state built over the Bunch-Davies state o…
Scale-invariance in expanding and contracting universes from two-field models
Andrew J. Tolley, Daniel H. Wesley
We study cosmological perturbations produced by the most general two-derivative actions involving two scalar fields, coupled to Einstein gravity, with an arbitrary field space metr…