| Speaker: | Giovanni Tambalo (Max Planck institute) |
|---|---|
| Title: | Resonant Features in Inflation Beyond Perturbation Theory |
| Date (JST): | Thu, Jun 15, 2023, 11:00 - 12:00 |
| Place: | Hybrid |
| Abstract: |
Inflationary perturbations are mostly Gaussian, with non-Gaussian features usually calculated using in-in perturbation theory. However, for unlikely fluctuations, non-Gaussianities can be important and the probability distribution is then better characterized in a semi-classical approximation, which takes into account classical non-linearities at the non-perturbative level. I will apply this method to resonant inflationary models, where the inflaton potential features tiny oscillatory modulations. In the limit where these modulations are very small and for a given curvature-perturbation profile at late times, the probability distribution can be studied analytically using a saddle-point approximation. I will describe the peculiar non-perturbative features we uncover, such as the oscillations as a function of the late-times field value. |
| Remarks: | Seminar Room A + Zoom |
