Coxeter group structure of cosmological billiards on compact spatial manifolds (2008)
Henneaux, Marc, Persson, Daniel, Wesley, Daniel H.
We present a systematic study of the cosmological billiard structures of Einstein-p-form systems in which all spatial directions are compactified on a manifold of nontrivial topology. This is...
Primordial black holes in the Dark Ages: Observational prospects for future 21cm surveys (2008)
Mack, Katherine J., Wesley, Daniel H.
We consider the signatures of a population of primordial black holes (PBHs) in future observations of 21cm radiation from neutral hydrogen at high redshift. We focus on PBHs in the mass range $5...
Oxidised cosmic acceleration (2008)
We give detailed proofs of several new no-go theorems for constructing flat four-dimensional accelerating universes from warped dimensional reduction. These new theorems improve upon previous ones by...
New no-go theorems for cosmic acceleration with extra dimensions (2008)
We describe new no-go theorems for producing four-dimensional accelerating universes from warped dimensional reduction. The new theorems improve upon previous results by including dynamical extra...
Magnetogenesis from Cosmic String Loops (2007)
Battefeld, Diana, Battefeld, Thorsten, Wesley, Daniel H., Wyman, Mark
Large-scale coherent magnetic fields are observed in galaxies and clusters, but their ultimate origin remains a mystery. We reconsider the prospects for primordial magnetogenesis by a cosmic string...
Scale-invariance in expanding and contracting universes from two-field models (2007)
Tolley, Andrew J., Wesley, Daniel H.
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 metric, that admit...
Observing cosmic string loops with gravitational lensing surveys (2007)
Mack, Katherine J., Wesley, Daniel H., King, Lindsay J.
We show that the existence of cosmic strings can be strongly constrained by the next generation of gravitational lensing surveys at radio frequencies. We focus on cosmic string loops, which...
Kac-Moody Algebras and Controlled Chaos (2006)
Compactification can control chaotic Mixmaster behavior in gravitational systems with p-form matter: we consider this in light of the connection between supergravity models and Kac-Moody algebras. We...
String Pair Production in a Time-Dependent Gravitational Field (2005)
Tolley, Andrew J., Wesley, Daniel H.
We study the pair creation of point-particles and strings in a time-dependent, weak gravitational field. We find that, for massive string states, there are surprising and significant differences...
Controlling Chaos through Compactification in Cosmological Models with a Collapsing Phase (2005)
Wesley, Daniel H., Steinhardt, Paul J., Turok, Neil
We consider the effect of compactification of extra dimensions on the onset of classical chaotic "Mixmaster" behavior during cosmic contraction. Assuming a universe that is well-approximated as a...
Kasner and Mixmaster behavior in universes with equation of state w \ge 1 (2003)
Erickson, Joel K., Wesley, Daniel H., Steinhardt, Paul J., Turok, Neil
We consider cosmological models with a scalar field with equation of state $w\ge 1$ that contract towards a big crunch singularity, as in recent cyclic and ekpyrotic scenarios. We show that chaotic...