273 citations · 2k across the 64 of their papers we have counts for
65 papers
Application and Evaluation of the Material Point Method for Low-Velocity Asteroid Collisions Involving Large Deformations
Haru Fukuta, Tomoaki Ishiyama, Shu-ichiro Inutsuka
The collisional lifetimes of asteroids larger than km in the present-day main belt are estimated to exceed the age of the solar system, suggesting that their shapes may p…
Pebbles to Gems: Intermediate-mass black holes in the first star clusters
Benedetta Mestichelli, Manuel Arca Sedda, Marta Volonteri +9
The rapid assembly of supermassive black holes (SMBHs) observed at requires efficient seeding mechanisms in the early Universe. Population III (Pop. III) star clusters…
Overmassive black holes and little red dots naturally form in simulations
Sunmyon Chon, Shingo Hirano, Tomoaki Ishiyama +2
The origin of supermassive black holes (SMBHs) remains a long-standing problem in astrophysics. Recent JWST observations reveal an unexpectedly abundant population of overmassive b…
The Origin of Spin-Alignment of Dark Matter Subhalos
Daiki Osafune, Keiichi Wada, Tomoaki Ishiyama +1
Subhalo spin is essential for modeling galaxy formation and controlling systematic uncertainties in intrinsic alignment (IA) studies. However, the physical mechanisms governing sub…
Comparison of simulations and semi-analytical model for WDM subhalo mass functions
Mizuki Ono, Takashi Okamoto, Shin'ichiro Ando +1
The Cold Dark Matter (CDM) model successfully explains large-scale structure formation, but challenges remain at smaller scales, leading to interest in Warm Dark Matter (WDM) as an…
Quantifying the Velocity Anisotropy Profile of Galaxy Clusters Using the Uchuu Cosmological Simulation
Mohamed H. Abdullah, Raouf H. Mabrouk, Tomoaki Ishiyama +2
Galaxy clusters are powerful laboratories for studying both cosmic structure formation and galaxy evolution. We present a comprehensive analysis of the velocity anisotropy profile,…