211 citations · 258 across the 3 of their papers we have counts for
6 papers · 1 filter
Dark Energy and the Return of the Phoenix Universe
Jean-Luc Lehners, Paul J. Steinhardt
In cyclic universe models based on a single scalar field (e.g., the radion determining the distance between branes in M-theory), virtually the entire universe makes it through the…
Bouncing Negative-Tension Branes
Jean-Luc Lehners, Neil Turok
Braneworlds, understood here as double domain wall spacetimes, can be described in terms of a linear harmonic function, with kinks at the locations of the boundary branes. In a dyn…
Kaluza-Klein Induced Supersymmetry Breaking for Braneworlds in Type IIB Supergravity
Jean-Luc Lehners, Paul Smyth, K. S. Stelle
We consider Z_2-symmetric braneworlds arising from 5-sphere compactifications with 5-form flux in type IIB supergravity. This Kaluza-Klein reduction produces a D=5 theory which sup…
Generating Ekpyrotic Curvature Perturbations Before the Big Bang
Jean-Luc Lehners, Paul McFadden, Neil Turok +1
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…
Effective Actions for Heterotic M-Theory
Jean-Luc Lehners, Paul McFadden, Neil Turok
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…
Colliding Branes in Heterotic M-theory
Jean-Luc Lehners, Paul McFadden, Neil Turok
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 appro…