428 citations
- The University of TokyoJP15 papers
- Tohoku UniversityJP15 papers
- The University of OsakaJP14 papers
- Kyoto UniversityJP12 papers
- Saga UniversityJP11 papers
- Fukuoka UniversityJP9 papers
- University of Teacher Education FukuokaJP9 papers
- Fukuoka Institute of TechnologyJP7 papers
- Hokkaido UniversityJP6 papers
- Kagoshima UniversityJP6 papers
- National Astronomical Observatory of JapanJP5 papers
- RIKEN Nishina CenterJP5 papers
4 papers · 2 filters
Observational constraints on a decaying cosmological term
Riou Nakamura, Masa-aki Hashimoto, Kiyotomo Ichiki
We investigate the evolution of a universe with a decaying cosmological term (vacuum energy) that is assumed to be a function of the scale factor. In this model, while the cosmolog…
Two evolutional paths of an axisymmetric gravitational instability in the dust layer of a protoplanetary disk
Fumiharu Yamoto, Minoru Sekiya
Nonlinear numerical simulations are performed to investigate the density evolution in the dust layer of a protoplanetary disk due to the gravitational instability and dust settling…
Heavy element nucleosynthesis in a collapsar
Shin-ichirou Fujimoto, Masa-aki Hashimoto, Kei Kotake +1
We investigate synthesis of heavy elements in a collapsar. We have calculated detailed composition of magnetically driven jets ejected from a collapsar, which is based on long-term…
Magnetohydrodynamic Simulations of A Rotating Massive Star Collapsing to A Black Hole
Shin-ichiro Fujimoto, Kei Kotake, Shoichi Yamada +2
We perform two-dimensional, axisymmetric, magnetohydrodynamic simulations of the collapse of a rotating star of 40 Msun and in the light of the collapsar model of gamma-ray burst.…