A scaling symmetry in a class of two-field inflation models naturally produces a massless isocurvature field whose self-interactions are suppressed, making primordial non-Gaussianity slow-roll suppressed but with a squeezed limit different from single-field inflation.
Non-Gaussian perturbations in hybrid inflation
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abstract
We consider second order inflationary perturbations in the case of two scalar fields, $\sigma$ and the inflaton $\phi$. We derive an expression for the non-Gaussianity of perturbations and apply the results to hybrid inflation. We isolate the contributions due to $\sigma$ and evaluate the resulting terms to show that $\sigma$-induced non-Gaussianities dominate over inflaton-induced non-Gaussianities when $m^2_{\sigma} \gtrsim \eta H^2$, where $\eta$ is the slow-roll parameter. This may provide a useful test of hybrid inflation in forthcoming CMB experiments.
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hep-th 1years
2019 1verdicts
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Origin of ultra-light fields during inflation and their suppressed non-Gaussianity
A scaling symmetry in a class of two-field inflation models naturally produces a massless isocurvature field whose self-interactions are suppressed, making primordial non-Gaussianity slow-roll suppressed but with a squeezed limit different from single-field inflation.