213 citations
- Nagoya UniversityJP86 papers
- The University of TokyoJP31 papers
- Kavli Institute for the Physics and Mathematics of the UniverseJP26 papers
- National Astronomical Observatory of JapanJP22 papers
- Obayashi (Japan)JP16 papers
- Science and Technology Facilities CouncilGB16 papers
- Centre National de la Recherche ScientifiqueFR13 papers
- Kyoto UniversityJP13 papers
- RIKEN Nishina CenterJP13 papers
- Rutherford Appleton LaboratoryGB13 papers
- Inter-University Centre for Astronomy and AstrophysicsIN10 papers
- High Energy Accelerator Research OrganizationJP9 papers
93 papers
Analyses on Christoph Clavius' Reports of Total Solar Eclipses in 1560 and 1567: Key References for the Centennial Variations of the Earth's Rotation Speed and the Solar Radius
Hisashi Hayakawa, Mitsuru Sôma, Jean-Pierre Rozelot +4
Variations in solar radius (hereafter R_Sun) is a key reference for solar magnetic activity in time. The sunlight amount may have varied with R_Sun and had an effect on the Earth's…
Charged multi-sheet wormhole solutions
Yusuke Makita, Keisuke Izumi, Daisuke Yoshida
We construct charged wormhole solutions with an even number of asymptotically flat regions in the four-dimensional Einstein-Maxwell-massless phantom scalar system via the Harrison…
Variable Earth's Rotation Speed in the 14th to 16th Centuries: New ΔT Constraints from Chinese Eclipse Records
Hisashi Hayakawa, Mitsuru Sôma, Naiqi Li
Total solar eclipses are not only astronomical spectacles but also great astrophysical laboratories. Their historical records are particularly helpful for assessing the past variab…
The First Four Ground-Level Enhancements in the 1940s: Investigation, Digitisation, and Analysis of Forgotten Data
Hisashi Hayakawa, Stepan Poluianov, Sergey Koldobskiy +4
Intense solar eruptions occasionally accelerate solar energetic particles (SEPs) and can trigger ground-level enhancements (GLEs). Among the 77 known GLEs, the first four GLEs, #1…
Robust chirality memory in carbon nanotubes growing under modulated and evolving environments
K. Otsuka, R. Fujiwara, S. Maruyama
Controlling the chirality and yield of carbon nanotubes is essential for their diverse applications from macroscopic composites to nanoelectronics. Floating-catalyst chemical vapor…
Large gas inflow driven by a matured galactic bar in the early Universe
Shuo Huang, Ryohei Kawabe, Hideki Umehata +3
Bar structures are present in about half of local disk galaxies and play pivotal roles in secular galaxy evolution. Bars impose a non-axisymmetric perturbation to the rotating disk…