Dynamics of electroweak symmetry breaking and its application to cosmology

该项目的首席成员吉村对如何利用新的实验技术确定中微子质量矩阵的性质(Majorana Vs Dirac)、绝对星等和所有混合角展开了一项新的研究。这种方法使用不稳定的原子态，当中微子对被具有一定调谐条件的高质量激光照射时，可以检测到它们的发射。最终目的是验证和阐明基于中微子的Majorana性质和质量生成的拉锯机制的瘦子发生宏大设计的想法。Moroi讨论了引力微子对大爆炸核合成的影响。结果表明，膨胀后的再热温度对再热温度有重要的制约作用，对瘦子发生和重子发生都提出了新的挑战。Hisano研究了中性微子暗物质情况下的暗物质探测，并进行了极大的改进计算。Tanabashi研究了TeV尺度额外维度模型中电弱对称破缺的结构。

The head member of this project, M. Yoshimura, has launched a new investigation of how to determine the nature (Majorana vs Dirac) and the absolute magnitude and all mixing angles of neutrino mass matrix by means of new experimental technique. This method uses unstable atomic states and detects a neutrino pair emission, when they are irradiated by a high-quality laser with some tuning condition. The ultimate goal is to verify and elucidate the idea of the grand design of leptogenesis, which is based on the Majorana nature of neutrino and the seesaw mechanism of mass generation.Moroi has discussed effects of gravitino on big-bang nucleosynthesis. The result shows important constraint on the reheat temperature after inflation, and imposes a new challenge both to leptogenesis and baryogenesis.Hisano studied, and greatly refined computation of, dark matter detection in cases of the neutralino dark matter.Tanabashi studied the structure of the electroweak symmetry breaking in TeV scale extra dimension models.