133 citations · 141 across the 2 of their papers we have counts for
9 papers
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…
The Scalar Field Kernel in Cosmological Spaces
Jurjen F. Koksma, Tomislav Prokopec, Gerasimos I. Rigopoulos
We construct the quantum mechanical evolution operator in the Functional Schrodinger picture - the kernel - for a scalar field in spatially homogeneous FLRW spacetimes when the fie…
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…
Simple route to non-Gaussianity in inflation
G. I. Rigopoulos, E. P. S. Shellard, B. J. W. van Tent
We present a simple way to calculate non-Gaussianity in inflation using fully non-linear equations on long wavelengths with stochastic sources to take into account the short-wavele…