Comment on non-Gaussianity in hybrid inflation

Abstract

In the literature there have been incompatible estimates for the amount of non-Gaussianity in hybrid inflation. In this note we point out the sources for the discrepancies and show that the results for the amount of non-Gaussianity in hybrid inflation obtained by two different methods, namely, perturbing Einstein equation to second order and the separate universe approach, indeed are compatible. This provides confidence in the methods themselves and in the actual computation of non-Gaussianities.

4 pages

Cited by in corpus (7)

• 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
• Very Large Primordial Non-Gaussianity from multi-field: Application to Massless Preheating
• Preheating and the non-gaussianity of the curvature perturbation
• On the Issue of the ζSeries Convergence and Loop Corrections in the Generation of Observable Primordial Non-Gaussianity in Slow-Roll Inflation. Part II: the Trispectrum
• The Origin of the Large-Scale Structure in the Universe: Theoretical and Statistical Aspects
• Non-gaussianity and Statistical Anisotropy in Cosmological Inflationary Models
• Large non-Gaussianity generated after D-term Inflation by Right-Handed Sneutrino Curvaton