| 日時: |
2005-05-31 11:00 - |
| 場所: |
研究本館2階220号室 |
| 会議名: |
A Bottom-Up Approach to Moduli Dynamics in Heavy Gravitino Scenario |
| 連絡先: |
丹後 |
| 講演者: |
遠藤 基 氏 (東京大学宇宙線研究所) |
| 講演言語: |
日本語 |
| アブストラクト: |
Physics of moduli fields is examined in the scenario where gravitino is relatively heavy with mass of order 10 TeV, which may be favored in view of the severe gravitino problem. The form of moduli superpotential is shown to be determined, if one imposes a phenomenological requirement that no physical CP phase arises in gaugino masses from conformal anomaly mediation. This bottom-up approach allows only two types of superpotential, each of which can have its origins in fundamental underlying theory such as superstring. One superpotential is the sum of an exponential and a constant, which may be identical to that obtained by Kachru et al. (KKLT), and the other is the racetrack superpotential with two exponentials. The general form of soft supersymmetry breaking masses are derived, and the pattern of superparticle mass spectrum in the minimal supersymmetric standard model are discussed with the KKLT-type superpotential. It is shown that the moduli mediation and the anomaly mediation make comparable contributions to the soft masses. At the weak scale, the gaugino masses are rather degenerate compared to the minimal supergravity, which bring characteristic features on the superparticle masses. In particular, the lightest neutralino, which often constitutes the lightest superparticle and thus a dark matter candidate, is a considerable admixture of gauginos and higgsinos. We also find a small mass hierarchy among the moduli, gravitino, and superpartners of the standard-model fields. Cosmological implications of the scenario are briefly described.
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