| Speaker: | Yi Wang (Kavli IPMU) |
|---|---|
| Title: | Isocurvatons during inflation: the heavy, the quasi- and the light |
| Date (JST): | Tue, Oct 02, 2012, 15:30 - 16:30 |
| Place: | Seminar Room A |
| Related File: | 760.pdf |
| Abstract: |
The isocurvature fluctuations during inflation are disucssed and classified by the range of isocurvaton mass: (1) The heavy fields (M>>H) decouple at tree level perturbation theory. However, at one loop level those fields do not decouple. As a result,inflation becomes UV sensitive. (2) The quasi-heavy fields (M~H) could show up in perturbations but not in the background level. As a result, inflation becomes quasi-single field and large non-Gaussanities could arise. (3) The light fields are best studied in the literature. Here we emphasize one possibility that the classical inflationary trajectory could bifurcate. This provides a constraint on inflation happening on a complicated landscape. |
