Dynamics of electroweak symmetry breaking and its application to cosmology

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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.