http://arxiv.org/abs/2104.01953
One-loop correction to the power spectrum in generic single-field inflation is calculated extracting the most important operator, which also generates primordial non-Gaussianity, using soft effective field theory. Due to the enhancement inversely proportional to the observed red-tilt of the spectral index of curvature perturbation, the correction turns out to be much larger than previously anticipated. As a result, the primordial non-Gaussianity must be much smaller than the current observational bound in order to warrant the validity of cosmological perturbation theory.
J. Kristiano and J. Yokoyama
Tue, 6 Apr 2021
50/55
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