The Vera C. Rubin Observatory released its first images taken with the world’s largest digital camera on June 23, 2025 (local time). This marks the beginning of the Legacy Survey of Space and Time (LSST), a large-scale imaging project. Many Japanese researchers, including ones from the Kobayashi-Maskawa Institute for the Origin of Particles and the Universe (KMI) at Nagoya University and the National Astronomical Observatory of Japan (NAOJ), are involved in LSST, and new scientific discoveries are expected through collaboration …

KMI2025, the 6th KMI International Symposium, has successfully concluded! 🎉 We held the symposium from Mar. 5th to 7th at Sakata-Hirata Hall, Nagoya University. Over three days, we welcomed 140 on-site attendees, 40 invited lectures, and 35 poster presentations—plus plenty of networking during our well-timed coffee breaks. Thank you all for joining us! See you next time! Related pages KMI2025 – indico

The XENON collaboration is an international collaboration between the United States, Europe and Japan, involving the KMI and ISEE at the Nagoya University, the Kavli IPMU, WPI at the University of Tokyo, the Institute for Cosmic Ray Research at the University of Tokyo and Kobe University. The collaboration has observed for the first time the scattering of neutrinos and xenon nuclei produced by the Sun in the XENONnT experiment, a dark matter search experiment currently in operation. The results were …

A joint research group led by Professor Takahiro Tanaka (Kyoto University) and Associate Professor Yuko Urakawa (KEK, and Designated Associate Professor at KMI) has applied the “split universe approach,” in which the universe is recomposed into a coarse-grained mosaic art, to greatly simplify numerical calculations of primordial gravitational waves. This approach enables the numerical calculation of various models of the universe, including those that have been difficult to analyze due to the complex numerical calculations required. It is expected to …

The J-PARC muon g-2/EDM experimental group, which includes Professor Toru Iijima, Designated Lecturer Kazuhito Suzuki, Associate Professor Kenji Inami, and graduate students Kazuji Sumi, Koichi Ueda, and Ayaka Kondo, has successfully cooled and accelerated positively charged muons for the first time in the world. This achievement marks a major step toward launching an ultra-precise verification of the Standard Model. Additionally, a completely new imaging technique using accelerated muons is being considered for various applications, including muon microscopy and interdisciplinary research …

Abstract Our groups, led by Associate Professor Kazuhiro Nakazawa at Nagoya University/KMI and first-year Ph.D. student Yuki Omiya at the Graduate School of Science, in collaboration with a research team led by Project Researcher Kohei Kurahara at the Mizusawa VLBI Observatory, National Astronomical Observatory of Japan (NAOJ), discovered an extended radio emission in the Hydra cluster, about 150 million light-years away. Galaxy clusters are the largest self-gravitating objects in the Universe, surrounded by hot gas, magnetic fields, and cosmic rays …