Study of compactification in superstring and low energy effective theories

超弦紧致化和低能有效理论研究

• 批准号: 14540251
• 负责人: SUEMATSU Daijiro
• 金额: $ 1.79万
• 依托单位: Kanazawa University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14540251/
• 关键词: Superstring; Supersymmetry; Unified theory; ニュートリノ

Phenomenological features of supersymmetric models derived as low energy effective theories of superstring have been studied from various points of view. Main results obtained in this project are followings.1. If we introduce a certain symmetry which may solve the famous doublet-triplet splitting problem, the mass of gauginos becomes nonuniversal in the framework of gauge mediation supersymmetry breaking. We studied this aspect in an SU(5) model and also the mass spectrum of superpartners. We pointed out that the feature of this spectrum was favored by the μ problem.2. In general CP phases in the supersymmetry breaking parameters induce dangerous EDM of an electron and a neutron. We showed that the CP phases in the mass of gauginos can contribute to these EDMs in such a way that they cancel other contributions. In that case large CP phases can be allowed in the supersymmetry breaking parameters. We studied allowed parameter regions of the supersymmetry breaking parameters and discussed the possibility of light Higgs in that case.3. We constructed a neutrino model which can realize successful leptogenesis escaping the gravitino problem. We showed that reheating temperature can be lower than the one which is required from the gravitino problem if we construct a model which realizes maximum CP asymmetry and satisfies constraints from neutrino oscillation experiments.4. We constructed a model for baryogenesis and dark matter by using a flat direction related to the μ problem.

从不同角度研究了作为超弦低能有效理论的超对称模型的唯象特征。本课题取得的主要成果如下：1.研究成果。如果我们引入某种对称性来解决著名的二重-三重分裂问题，那么在规范中介超对称破缺的框架下，伽吉诺粒子的质量就变成了非普适的。我们在SU(5)模型中研究了这一方面，并研究了超伙伴的质量谱。我们指出，μ问题有利于这一频谱的特征。一般来说，超对称破缺参数中的CP相会导致一个电子和一个中子的危险电火花加工。我们证明了大量加吉诺星中的CP相可以通过抵消其他贡献的方式对这些EDM做出贡献。在这种情况下，超对称破缺参数中可以允许大的CP相。我们研究了超对称破缺参数的允许参数区域，并讨论了在这种情况下产生轻希格斯的可能性。我们建立了一个中微子模型，它可以成功地实现细微发生，而不是引力子问题。我们证明，如果我们构造一个模型来实现最大的CP不对称性，并且满足中微子振荡实验的约束，那么再加热温度可以低于引力子问题所要求的温度。我们利用与μ问题相关的平坦方向构造了一个重子发生和暗物质的模型。

项目成果

Daijiro Suematsu: "D-term inflation and neutrino mass"Journal of High Energy Physics. 10. 014-1-014-17 (2002)

末松大二郎：《D项暴胀与中微子质量》高能物理学杂志。

Garglns CP phases and EDMs in the extended gange mediation SUSY breaking

扩展恒河介导 SUSY 破坏中的 Garglns CP 相和 EDM

• 发表时间: 2004
• 期刊: Journal of High Energy Physics 05
• 作者: Takayasu Baba;Daijiro Suematsu;D.Suematsu
• 通讯作者: D.Suematsu

Daijiro Suematsu: "Soft supersymmetry breaking masses in a unified model with doublet-triplet splitting"Physical Review D. 67・7. 075020-1-075020-7 (2003)

末松大次郎：“具有二重态-三重态分裂的统一模型中的软超对称破缺质量”物理评论 D. 67・7（2003）

Daijiro Suematsu: "Soft SUSY breaking masses in a unified model with doublet-triplet splitting"Physical Review D. 67. 075020-1-075020-7 (2003)

Daijiro Suematsu：“具有双线态-三线态分裂的统一模型中的软 SUSY 断裂质量”物理评论 D. 67. 075020-1-075020-7 (2003)

μ-term as the origin of baryon and lepton number asymmetry

μ项作为重子和轻子数不对称性的起源

• 发表时间: 2005
• 期刊: J.Phys.G : Nucl.Part.Phys. 31
• 作者: Jisuke Kubo;Daijiro Suematsu;Daijiro Suematsu;Daijiro Suematsu;Daijiro Suematsu;D.Suematsu;T.Baba and D.Suematsu;Daijiro Suematsu
• 通讯作者: Daijiro Suematsu