| 日時: |
2014-06-03 11:00 - 12:00 |
| 場所: |
研究本館１階会議室1 |
| 会議名: |
Natural inflation with effective large decay constant by hierarchical charge |
| 連絡先: |
佐藤亮介、rsato-AT-post.kek.jp |
| 講演者: |
張ヶ谷 圭介 氏 ((Kavli IPMU カブリ数物連携宇宙研究機構)) |
| 講演言語: |
英語 |
| アブストラクト: |
Natural inflation is a large field model, which is favored from the view point of the initial condition problem. The inflaton can be understood as a Nambu Goldstone boson associated with a spontaneous breaking of an U(1) symmetry. The inflaton potential can be understood as an explicite breaking of the U(1) symmetry to a discrete one. Since the decay constant of the inflaton must be larger than the Planck scale for a successful slow-roll inflation, it is not clear whether natural inflation model can be treated by four dimensional field theory, which has a cut off at the Planck scale. In this talk, I show that the large decay constant can be obtained from a field theory with all the scale below the Planck scale, by considering hierarchical U(1) charges. |
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