| DATE: |
2011-04-26 11:00 - 12:00 |
| PLACE: |
Kenkyu Honkan 1F, Meeting Room 1 |
| TITLE: |
CMB Fluctuations and String Compactification Scales |
| CONTACT: |
Yasuhiro Sekino, sekino-AT-post.kek.jp |
| SPEAKER: |
Dr. Yasuhiro Sekino (KEKˇˇTheory Center) |
| LANGUAGE: |
English |
| URL: |
http://research.kek.jp/group/www-theory/schedule.html |
| ABSTRACT: |
Abstract:
We propose a mechanism for the generation of temperature fluctuations of cosmic microwave background. We consider a large number of fields, such as Kaluza-Klein modes and string excitations. Each field contributes to the gravitational potential by a small amount, but an observable level of temperature fluctuations is achieved by summing up the contribution of typically of order 10^{14} fields. Tensor fluctuations are hardly affected by these fields. Our mechanism is based on purely quantum effects, and is different from the "slow-roll" or "curvaton" scenario. Using the observed data, we find constraints on the parameters of this model, such as the size of the extra dimensions and the string scale. Our model predicts a particular pattern of non-gaussianity with a small magnitude.
|
