201 citations · 1.8k across the 54 of their papers we have counts for
10 papers · 1 filter
Parametric Decay of the Curvaton
K. Enqvist, S. Nurmi, G. I. Rigopoulos
We argue that the curvaton decay takes place most naturally by way of a broad parametric resonance. The mechanism is analogous to resonant inflaton decay but does not require any t…
On the divergences of inflationary superhorizon perturbations
K. Enqvist, S. Nurmi, D. Podolsky +1
We discuss the infrared divergences that appear to plague cosmological perturbation theory. We show that within the stochastic framework they are regulated by eternal inflation so…
Decoherence from Isocurvature Perturbations in Inflation
Tomislav Prokopec, Gerasimos I. Rigopoulos
We discuss the possible role of isocurvature perturbations for the quantum decoherence of the curvature perturbation during inflation. We point out that if the inflaton trajectory…
Quantitative bispectra from multifield inflation
G. I. Rigopoulos, E. P. S. Shellard, B. J. W. van Tent
After simplifying and improving the non-Gaussian formalism we developed in previous work, we derive a quantitative expression for the three-point correlator (bispectrum) of the cur…
Large non-Gaussianity in multiple-field inflation
G. I. Rigopoulos, E. P. S. Shellard, B. J. W. van Tent
We investigate non-Gaussianity in general multiple-field inflation using the formalism we developed in earlier papers. We use a perturbative expansion of the non-linear equations t…
Non-linear perturbations in multiple-field inflation
G. I. Rigopoulos, E. P. S. Shellard, B. J. W. van Tent
We develop a non-linear framework for describing long-wavelength perturbations in multiple-field inflation. The basic variables describing inhomogeneities are defined in a non-pert…