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Beyond Perturbation Theory in Inflation
[article]
2021
arXiv
pre-print
Inflationary perturbations are approximately Gaussian and deviations from Gaussianity are usually calculated using in-in perturbation theory. This method, however, fails for unlikely events on the tail of the probability distribution: in this regime non-Gaussianities are important and perturbation theory breaks down for |ζ| ≳ |f_ NL|^-1. In this paper we show that this regime is amenable to a semiclassical treatment, ħ→ 0. In this limit the wavefunction of the Universe can be calculated in
arXiv:2103.09244v2
fatcat:nnlqjz2l2rbqjlfkqnrxza7esm