De Sitter Quantum Loops as the origin of Primordial Non-Gaussianities

Understand

It was pointed out recently that in some inflationary models quantum loops containing a scalar of mass $m$ that couples to the inflaton can be the dominant source of primordial non-Gaussianities.

• We explore this phenomenon in the simplest such model focusing on the behavior of the primordial curvature fluctuations for small $m/H$.
• Explicit calculations are done for the three and four point curvature fluctuation correlations.
• Constraints on the parameters of the model from the CMB limits on primordial non-Gaussianity are discussed.