Purpose and Significance of the Research

　We will attack the outstanding problems in the study of the early universe: inflation, the dark matter, the origin of the asymmetry between matter and antimatter, and the massive black holes. Those problems are addressed by the most-advanced neutrino experiment Hyper-Kamiokande, the CMB telescope Simons Observatory, the dark matter experiment XENON, and the cosmic neutrino telescope IceCube. A major synergistic effect can be achieved by consolidating the development of state-of-the-art technologies (photodetectors, electronic circuits, large-scale data, and AI development and analysis).