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2021

Perturbative unitarity in quasi-single field inflation

Kim, Suro, Noumi, Toshifumi, Takeuchi, Keito et al.

Understand

We study implications of perturbative unitarity for quasi-single field inflation with the inflaton and one massive scalar.

Analyzing high energy scattering, we show that non-Gaussianities with $|f_{\rm NL}|\gtrsim1$ cannot be realized without turning on interactions which violate unitarity at a high energy scale.
Then, we provide a relation between $f_{\rm NL}$ and the scale of new physics that is required for UV completion.
In particular we find that for the Hubble scale $H\gtrsim 6\times 10^{9}$ GeV, Planck suppressed operators can easily generate too large non-Gaussanities and so it is hard to realize successful quasi-single field inflation without introducing a mechanism to suppress quantum gravity corrections.