Why Primordial Non-Gaussianity is Very Small?. (arXiv:2104.01953v1 [hep-th])
<a href="http://arxiv.org/find/hep-th/1/au:+Kristiano_J/0/1/0/all/0/1">J. Kristiano</a>, <a href="http://arxiv.org/find/hep-th/1/au:+Yokoyama_J/0/1/0/all/0/1">Jun'ichi Yokoyama</a>
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.
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.
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