Holography for Cosmology (2009)
McFadden, Paul, Skenderis, Kostas
We propose a holographic description of four-dimensional single-scalar inflationary universes, and show how cosmological observables, such as the primordial power spectrum, are encoded in the...
Generating Ekpyrotic Curvature Perturbations Before the Big Bang (2007)
Lehners, Jean-Luc, McFadden, Paul, Turok, Neil, Steinhardt, Paul J.
We analyze a general mechanism for producing a nearly scale-invariant spectrum of cosmological curvature perturbations during a contracting phase preceding a big bang, that can be entirely described...
Effective Actions for Heterotic M-Theory (2006)
Lehners, Jean-Luc, McFadden, Paul, Turok, Neil
We discuss the moduli space approximation for heterotic M-theory, both for the minimal case of two boundary branes only, and when a bulk brane is included. The resulting effective actions may be used...
A Signature of Higher Dimensions at the Cosmic Singularity (2006)
In this thesis we study the dynamics of higher-dimensional gravity in a universe emerging from a brane collision. We develop a set of powerful analytic methods which, we believe, render braneworld...
Colliding Branes in Heterotic M-theory (2006)
Lehners, Jean-Luc, McFadden, Paul, Turok, Neil
We study the collision of two flat, parallel end-of-the-world branes in heterotic M-theory. By insisting that there is no divergence in the Riemann curvature as the collision approaches, we are able...
Solution of a Braneworld Big Crunch/Big Bang Cosmology (2005)
McFadden, Paul, Turok, Neil, Steinhardt, Paul J.
We solve for the cosmological perturbations in a five-dimensional background consisting of two separating or colliding boundary branes, as an expansion in the collision speed V divided by the speed...