| Speaker: | Takahiro Tanaka (YITP) |
|---|---|
| Title: | Natural selection of inflationary vacuum required by infra-red regularity and gauge-invariance. |
| Date (JST): | Wed, May 18, 2011, 13:30 - 15:00 |
| Place: | Seminar Room A |
| Abstract: |
It has been an issue of debate whether the inflationary infrared (IR) divergences are physical or not. Our claim is that, at least, in single-field models, the answer is "No," and that the spurious IR divergence is originating from the careless treatment of the gauge modes. However, if we explicitly calculate the IR loop correction even for genuine gauge-invariant quantities, we encounter divergent expression. To remove this divergence, we also need to require the gauge invariance in the choice of the initial vacuum, which is a new concept that has not been considered in conventional calculations. |
