5 papers · 1 filter
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…
Multiple-field inflation and the CMB
Bartjan van Tent
In this paper, we investigate some consequences of multiple-field inflation for the cosmic microwave background radiation (CMB). We derive expressions for the amplitudes, the spect…