109 citations
- University of TsukubaJP13 papers
- National Astronomical Observatory of JapanJP9 papers
- The University of TokyoJP8 papers
- Hiroshima UniversityJP7 papers
- Kyoto UniversityJP6 papers
- Tokai UniversityJP4 papers
- Chinese Academy of SciencesCN3 papers
- Fukuoka UniversityJP3 papers
- Harvard UniversityUS3 papers
- Massachusetts Institute of TechnologyUS3 papers
- Nagoya UniversityJP3 papers
- National Astronomical ObservatoriesCN3 papers
51 papers
Out-of-time-ordered correlators for turbulent fields: a quantum-classical correspondence
Motoki Nakata
An extended formulation of out-of-time-ordered correlators (OTOCs), which quantify noncommutative operator growth and information scrambling in quantum many-body systems, is develo…
On-Demand Lecture Watching System Using Various Actions of Student Characters to Maintain Concentration
Saizo Aoyagi, Ryoma Okazaki, Seishiro Hara +2
Since the COVID-19 pandemic, online lectures have spread rapidly and many students are satisfied with them. However, one challenge remains the loss of concentration due to the lack…
Clumpy Outflows from Super-Eddington Accreting Black Holes I: Radiation Hydrodynamics Simulations and Observational Implications
Haojie Hu, Yuta Asahina, Shogo Yoshioka +2
Recent advances in X-ray spectroscopic observation have enabled researchers to reveal distinct clumpy structures in the super-Eddington outflows from the supermassive black hole in…
Landscape computations for the edge of chaos in nonlinear dynamical systems
Motoki Nakata, Masaaki Imaizumi
We propose a stochastic sampling approach to identify stability boundaries in general dynamical systems. The global landscape of Lyapunov exponent in multi-dimensional parameter sp…
GR-RMHD Simulations of Super-Eddington Accretion Flows onto a Neutron Star with Dipole and Quadrupole Magnetic Fields
Akihiro Inoue, Ken Ohsuga, Hiroyuki R. Takahashi +2
Although ultraluminous X-ray pulsars (ULXPs) are believed to be powered by super-Eddington accretion onto a magnetized neutron star (NS), the detailed structures of the inflow-outf…
Precessing jet nozzle connecting to a spinning black hole in M87
Yuzhu Cui, Kazuhiro Hada, Tomohisa Kawashima +76
The nearby radio galaxy M87 offers a unique opportunity to explore the connections between the central supermassive black hole and relativistic jets. Previous studies of the inner…