Primordial Non-Gaussianity in Multi-Scalar Slow-Roll Inflation

Abstract

We analyze the non-Gaussianity for primordial curvature perturbations generated in multi-scalar slow-roll inflation model including the model with non-separable potential by making use of $\delta N$ formalism. Many authors have investigated the possibility of large non-Gaussianity for the models with separable potential, and they have found that the non-linear parameter, $f_{NL}$, is suppressed by the slow-roll parameters. We show that for the non-separable models $f_{NL}$ is given by the product of a factor which is suppressed by the slow-roll parameters and a possible enhancement factor which is given by exponentials of quantities of O(1).

8 pages

References in corpus (1)

• Non-gaussianity from the second-order cosmological perturbation

Cited by in corpus (5)

• Enhanced Non-Gaussianity from Excited Initial States
• Primordial Non-Gaussianities of General Multiple Field Inflation
• On the Issue of the ζSeries Convergence and Loop Corrections in the Generation of Observable Primordial Non-Gaussianity in Slow-Roll Inflation. Part I: the Bispectrum
• Nonlinear superhorizon perturbations of non-canonical scalar field
• On the four-dimensional effective theories in brane-worlds