34 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Niigata UniversityJP2 papers
- Waseda UniversityJP2 papers
- A. Alikhanyan National LaboratoryAM1 paper
- Aalto UniversityFI1 paper
- Abiola Ajimobi Technical University IbadanNG1 paper
- Academia SinicaTW1 paper
- Academy of AthensGR1 paper
- Advanced Research InstituteUS1 paper
- Agence Parisienne du ClimatFR1 paper
- Agenzia Spaziale ItalianaIT1 paper
- Amherst CollegeUS1 paper
- Astrobiology CenterJP1 paper
11 papers
Broadband Multi-wavelength Properties of M87 during the 2018 EHT Campaign including a Very High Energy Flaring Episode
J. C. Algaba, M. Balokovic, S. Chandra +738
The nearby elliptical galaxy M87 contains one of the only two supermassive black holes whose emission surrounding the event horizon has been imaged by the Event Horizon Telescope (…
Numerical accuracy and stability of semilinear Klein--Gordon equation in de Sitter spacetime
Takuya Tsuchiya, Makoto Nakamura
Numerical simulations of the semilinear Klein--Gordon equation in the de Sitter spacetime are performed. We use two structure-preserving discrete forms of the Klein--Gordon equatio…
On the stability of covariant BSSN formulation
Ryosuke Urakawa, Takuya Tsuchiya, Gen Yoneda
In this study, we investigate the numerical stability of the covariant BSSN (cBSSN) formulation proposed by Brown. We calculate the constraint amplification factor (CAF), which is…
Stable numerical simulation of Einstein equations in gravitational collapse space--time
Takuya Tsuchiya, Ryosuke Urakawa, Gen Yoneda
We perform simulations in a gravitational collapsing model using the Einstein equations. In this paper, we review the equations for constructing the initial values and the evolutio…
On the numerical experiments of the Cauchy problem for semi-linear Klein-Gordon equations in the de Sitter spacetime
Takuya Tsuchiya, Makoto Nakamura
The computational analysis of the Cauchy problem for semi-linear Klein-Gordon equations in the de Sitter spacetime is considered. Several simulations are performed to show the time…
Classification theorems for biharmonic real hypersurfaces in a complex projective space
Toru Sasahara
First, we classify proper biharmonic Hopf real hypersurfaces in . Next, we classify proper biharmonic real hypersurfaces with two distinct principal curvatures in $\…
Ricci curvature of real hypersurfaces in non-flat complex space forms
Toru Sasahara
We establish an inequality among the Ricci curvature, the squared mean curvature, and the normal curvature for real hypersurfaces in complex space forms. We classify real hypersurf…
Fiber-coupled pillar array as a highly pure and stable single-photon source
Satoru Odashima, Hirotaka Sasakura, Hideaki Nakajima +1
A highly pure and stable single-photon source is prepared that comprises a well-designed pillar array in which each pillar contains only a few InAs quantum dots. A nano-pillar in t…
Biharmonic C-parallel Legendrian submanifolds in 7-dimensional Sasakian space forms
Toru Sasahara
In [5], D. Fetcu and C. Oniciuc presented the classification result for biharmonic -parallel Legendrian submanifolds in -dimensional Sasakian space forms. However,…
Surfaces in Euclidean 3-space whose normal bundles are tangentially biharmonic
Toru Sasahara
A submanifold is said to be tangentially biharmonic if the bitension field of the isometric immersion that defines the submanifold has vanishing tangential component. The purpose o…
Quasi-biharmonic Lagrangian surfaces in Lorentzian complex space forms
Toru Sasahara
In this paper, we introduce the notion of a quasi-biharmonic submanifold in a pseudo-Riemannian manifold and classify quasi-biharmonic marginally trapped Lagrangian surfaces in Lor…