Superstring Theory and Low-Energy Physics

超弦理论与低能物理

基本信息

批准号：
02640223
负责人：
MATSUOKA Takeo
金额：
$ 0.77万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

项目摘要

Superstring theory is the most promising unified theory. In this theory the space-time dimension should be more than four so that the theory becomes consistent at quantum level. Four-dimensional effective theory is derived after the compactification through which the extra-dimensional space becomes a conformal invariant comactified manifold dynamically. In this theory topological and geometrical structure of the manifold is closely related to various properties of the low-energy effective theory such as gauge symmetries, matter fields and their couplings. Therefore, it is of critical importance to clarify the relation between the structure of compactified manifold and low-energy effective theory. In this proposed spontaneous deformation of conformal invariant manifold and using this mechanism we investigated viable effective theory from calabi-Yau superstring. We studied characteristic features of the effective theory and expected new phennomena at the electroweak scale.1. We found realistic solutions in which the proton stability is guaranteed and the unification of gauge couplings is realized.2. We pointed out the possibility that R-parity is spontaneously broken at TeV scale. Chargino and neutralino mass spectra are calculated and the lightest masses among them are predicted to be less than weak boson masses. Furthemore, we discussed the generation number and the structure of flavor mixing.3. In the two-Higgs-doublet model expected from the supersymmetric model, it is found that the charged Higgs contribution can give a sizable enhancement to the branching fractions of B-meson charamless decay.4. We studied the stability of quantum chiral solitions coupled with the vector mesons.

超弦理论是最有前途的统一理论。在这个理论中，时空维度应超过四个，以使该理论在量子层面上变得一致。四维有效理论是在压实后得出的，超二维空间会动态地变成形式不变的歧管。在这个理论中，歧管的拓扑结构和几何结构与低能量有效理论的各种特性密切相关，例如仪表对称性，物质场及其耦合。因此，至关重要的是，阐明压缩流形和低能有效理论之间的关系是至关重要的。在这种提出的共形不变歧管的自发变形中，我们使用了这种机制，我们研究了Calabi-yau Superstring的可行有效理论。我们研究了有效理论的特征，并预期了Electroweak量表上的新Phennomena.1。我们发现了保证质子稳定性并实现量规统一的现实解决方案。2。我们指出了R-Parity在TEV量表上自发破坏的可能性。计算了chargino和中性质量光谱，其中最轻的质量预计将小于弱的玻色子质量。此外，我们讨论了生成数量和风味混合的结构3。在超对称模型预期的两种型二键盘模型中，发现带电的希格斯的贡献可以给B-梅森无炭衰变的分支分数提供相当大的增强。4。我们研究了量子性手性销钉与载体介子的稳定性。