Non-Gaussianity constrains hybrid inflation (2009)
Mulryne, David, Seery, David, Wesley, Daniel
In hybrid inflationary models, inflation ends by a sudden instability associated with a steep ridge in the potential. Here we argue that this feature can generate a large contribution to the...
Moment transport equations for non-Gaussianity (2009)
Mulryne, David J., Seery, David, Wesley, Daniel
We present a novel method for calculating the primordial non-Gaussianity produced by super-horizon evolution during inflation. Our method evolves the distribution of coarse-grained inflationary field...
Dark Energy, Inflation and Extra Dimensions (2008)
Steinhardt, Paul J., Wesley, Daniel
We consider how accelerated expansion, whether due to inflation or dark energy, imposes strong constraints on fundamental theories obtained by compactification from higher dimensions. For theories...
Tunneling with negative tension (2008)
We describe a new family of thin-wall instantons, with negative tension bubble walls, that mediate tunneling between Minkowski or de Sitter vacua. Some of these instantons can have exponentially...