Category: 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 …

Abstract Our group led by Associate Professor Kazuhiro Nakazawa at Nagoya University/KMI, and doctoral course student Yuki Omiya at the Graduate School of Science, in collaboration with the National Astronomical Observatory of Japan, Tokyo University of Science, Hiroshima University, Saitama University, JAXA Institute of Space and Astronautical Science, Tokyo Metropolitan University, Netherlands Institute for Space Sciences, and Toho University, succeeded in estimating the length, width, depth, and merging velocity of the shock wave just born in the nearby merging galaxy …

The values of fundamental constants of nature, dubbed as physical constants, might be affected by new elementary particles and unknown forces of nature, according to a study by an international group of researchers that includes Designated Assistant Professor Teppei Kitahara at KMI and Institute for Advanced Research, Nagoya University and at IPNS, KEK (cross appointment). The findings were published in the journal Physical Review Letters. Scientists continuously strive to develop and refine theories that explain the world and the universe …

The FASER collaboration (ForwArd Search ExpeRiment at the LHC; FASER) reported that the FASER detector has achieved observations accurate enough to detect the presence of neutrinos produced at the collider. Established in 2017, the FASER experiment aims to discover elementary particles that could contribute to a better understanding of dark matter, as well as to study neutrinos in the unexplored high-energy region to explore the unknown physical laws behind the Standard Model of elementary particles. The experiment focuses on secondary …

An international team of astrophysicists and cosmologists at various institutes including Kobayashi-Maskawa Institute for the Origin of Particles and the Universe (KMI) at Nagoya University, the Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU) at the University of Tokyo, and Princeton University have submitted a set of five papers, measuring the a value for the “clumpiness” of the universe’s dark matter, known to cosmologists as S8, of 0.76, which aligns with values that other gravitational lensing …

The XENON collaboration Kobayashi-Maskawa Institute for the Origin of Particles and the Universe, Nagoya University (KMI) Institute for Space-Earth Environmental Research, Nagoya University (ISEE) Kavli Institute for the Physics and Mathematics of the Universe, The University of Tokyo (Kavli IPMU) Institute for Cosmic Ray Research, The University of Tokyo (ICRR) Graduate School of Science, Kobe University credit: XENON Collaboration (E. Sacchetti) Scientists from the international XENON collaboration, an international experimental group including the Kobayashi-Maskawa Institute for the Origin of Particles …

Scientists from the international XENON collaboration, an international experimental group including the Kobayashi-Maskawa Institute for the Origin of Particles and the Universe (KMI), Nagoya University; the Institute for Space-Earth Environmental Research (ISEE), Nagoya University; the Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU), The University of Tokyo; the Institute for Cosmic Ray Research (ICRR), The University of Tokyo; and the Graduate School of Science, Kobe University, announced today the first results from XENONnT, the latest detector …

ForwArd Search ExpeRiment at the LHC (FASER), an international collaboration involving KMI’s Toshiyuki Nakano, Mitsuhiro Nakamura, Hiroki Rokujo, and Osamu Sato has successfully observed neutrino reaction candidates from the LHC, the world’s highest energy collider. This result shows that the FASER experiment is indeed useful in the study of TeV-scale neutrinos. This achievement uses the nuclear emulsion technology developed by Nagoya University’s F Lab, which highlights the high mobility in equipment installation and development. The results of this research were …

Concern over attractiveness to the opposite sex affects the masculine image of physics and mathematics only in England, while having a negative view of intellectual women is correlated with a masculine image of mathematics as a field only in Japan, according to a survey conducted in the two countries by a Japanese research group. This comparative study shows that programs to increase women’s representation in these fields must take into account each country’s social context surrounding gender roles.   Visit …

A group of researchers, including scientists from Nagoya University, the High Energy Accelerator Research Organization (KEK), the University of Tokyo, Kyoto University, Kyushu University, Osaka Electro-Communication University, Tsukuba University, and Osaka University, reported the first result of neutron lifetime measurement by adopting a new experimental technique. Neutrons are one of the particles that constitute the nuclei of atoms. Neutron decay is related to the mechanism of synthesis of elements in the early universe and particle physics. This result paves a …