| DATE: |
2012-03-19 15:00 - 16:00 |
| PLACE: |
Kenkyu Honkan 1F, Meeting Room 3 |
| TITLE: |
A further discriminatory signature of inflation |
| CONTACT: |
Shin-ya TOMIZAWA, Tomizawa-AT-post.kek.jp |
| SPEAKER: |
Dr. Laila Alabidi (Yukawa Institute for Theoretical Physics, Kyoto University) |
| LANGUAGE: |
English |
| URL: |
http://research.kek.jp/group/www-theory/schedule.html |
| ABSTRACT: |
In this talk I revise the current status of canonical single field models of inflation in light of the WMAP 7 data, using the observational bounds on the spectral index and tensor fraction, extracted using the large scale measurements of the Cosmic Microwave Background. I then extend this analysis to include models which predict a significant positive running of the spectral index, which can lead to the production of Primordial Black Holes (PBHs) towards the end of inflation. I then explain the concept of induced gravitational waves, which are gravitational waves induced by scalar perturbations re- entering the horizon during nucleosynthesis. I consider the case where the scalar perturbations are created by Hilltop-type and Running Mass Models, and where the gravitational waves are induced early on in the radiation phase of the Universe. I explore the impact a detection of such GWs would have on the field of Inflation Model Discrimination in general. I show that the Hilltop-type model can produce observable induced gravitational waves within the range of BBO and DECIGO for integral and fractional powers of the potential within a reasonable number of e−folds. I also show that the running mass model can produce a spectrum within the range of these detectors, but require that inflation terminates after an unreasonably small number of e−folds. |
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