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Supersymmetric Composite Models in the Early Stage of the Universe

宇宙早期的超对称复合模型

基本信息

批准号：
11640280
负责人：
INAGAKI Tomohiro
金额：
$ 2.11万
依托单位：
HIROSHIMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

项目摘要

The supersymmetry is an essential ingredient of unified field theories for elementary particles. We tried to study the scenario of the early universe in supersymmetric version of composite Higgs models and obtained the following results.1. We investigated the phase structure of the supersymmetric composite Higgs models under the circumstances of the early universe. It is found that the broken chiral symmetry due to the soft SUSY breaking term is restored at suitably high temperature and the symmetry restoration occurs as first-order phase transitions. Cosmological implications of the result are discussed in connection with the creation of cosmic strings during the inflationary era.2. To see the essential feature of the composite models we studied the phase structure of a gauge theory at finite temperature by using the Schwinger-Dyson equation. We obtained the critical point and the critical exponents of the gauge theory with N flavor fermions.3. Non-perturvative approaches are necessary to study phenomenological consequences of models with vacuum condensation at high temperature. The anisotropic lattice is useful technique to study the non-perturbative effect in QCD at finite temperature. We found that the technique is also useful in heavy quark physics and the systematic uncertainty on the anisotropic lattice is under control.4. We apply the Schwinger-Dyson equation to higher dimensional gauge theories and see what influences could be observed on the standard model particles. It is found that an existence of the extra-dimensional space increases the dynamical generation of fermion masses.5. We investigated CP violation generating lepton number asymmetry at high energy scale. We obtained how CP violation at high energy can be related to low energy experiments.6. We assess the feasibility of probing dark enery with strong gravitational lensing systems. We determine the required quality of data from the gravitational lensing systems.

超对称性是基本粒子统一场论的一个重要组成部分。我们尝试在超对称的复合希格斯模型中研究早期宇宙的情形，得到了以下结果.我们研究了早期宇宙环境下超对称复合Higgs模型的相结构。研究发现，由于超对称性软破缺项而导致的手征对称性破缺在适当的高温下得到恢复，并且这种对称性恢复以一级相变的形式发生。宇宙学意义的结果进行了讨论，在暴胀时期的宇宙弦的创建。为了了解复合模型的本质特征，我们利用Schwinger-Dyson方程研究了有限温度下规范理论的相结构。得到了N味费米子规范理论的临界点和临界指数.非微扰方法是研究高温真空凝聚模型唯象结果的必要手段。各向异性格子是研究有限温度下QCD非微扰效应的有效方法。我们发现该技术在重夸克物理中也是有用的，并且各向异性晶格上的系统不确定性得到了控制.我们将Schwinger-Dyson方程应用于高维规范理论，看看可以观察到对标准模型粒子的影响。发现额外维空间的存在增加了费米子质量的动力学产生.我们研究了高能尺度下产生轻子数不对称性的CP破坏。我们得到了高能CP破坏与低能实验的关系.我们评估了利用强引力透镜系统探测暗能量的可行性。我们确定所需的质量数据的引力透镜系统。