Zobrazeno 1 - 10
of 120
pro vyhledávání: '"Yoshikawa, Kohji"'
Autor:
Higuchi, Hayato, Pedersen, Juan W., Toyoizumi, Kiichiro, Yoshikawa, Kohji, Kiumi, Chusei, Yoshikawa, Akimasa
The Vlasov-Maxwell equations provide kinetic simulations of collisionless plasmas, but numerically solving them on classical computers is often impractical. This is due to the computational resource constraints imposed by the time evolution in the 6-
Externí odkaz:
http://arxiv.org/abs/2408.11550
Publikováno v:
SC '21: Proceedings of the International Conference for High Performance Computing, Networking, Storage and Analysis, November 2021, Article No.5, pages 1-11
We report a Vlasov simulation of cosmic relic neutrinos combined with N-body simulation of cold dark matter in the context of large-scale structure formation in the Universe performed on Fugaku supercomputer. Gravitational dynamics of the neutrinos i
Externí odkaz:
http://arxiv.org/abs/2110.15867
We present the results of cosmological simulations of large-scale structure formation with massive neutrinos. The phase-space distribution of the cosmic relic neutrinos is followed, for the first time, by directly integrating the six-dimensional Vlas
Externí odkaz:
http://arxiv.org/abs/2010.00248
Autor:
Ueda, Shutaro, Kitayama, Tetsu, Oguri, Masamune, Komatsu, Eiichiro, Akahori, Takuya, Iono, Daisuke, Izumi, Takumi, Kawabe, Ryohei, Kohno, Kotaro, Matsuo, Hiroshi, Ota, Naomi, Suto, Yasushi, Takakuwa, Shigehisa, Takizawa, Motokazu, Tsutsumi, Takahiro, Yoshikawa, Kohji
RXJ1347.5-1145 (z = 0.451) is one of the most luminous X-ray galaxy clusters, which hosts a prominent cool core and exhibits a signature of a major merger. We present the first direct observational evidence for sub-sonic nature of sloshing motion of
Externí odkaz:
http://arxiv.org/abs/1808.09232
We develop new numerical schemes for Vlasov--Poisson equations with high-order accuracy. Our methods are based on a spatially monotonicity-preserving (MP) scheme and are modified suitably so that positivity of the distribution function is also preser
Externí odkaz:
http://arxiv.org/abs/1702.08521
Autor:
Yamauchi, Daisuke, Ichiki, Kiyotomo, Kohri, Kazunori, Namikawa, Toshiya, Oyama, Yoshihiko, Sekiguchi, Toyokazu, Shimabukuro, Hayato, Takahashi, Keitaro, Takahashi, Tomo, Yokoyama, Shuichiro, Yoshikawa, Kohji
Publikováno v:
Publ. Astron. Soc. Jpn. 68 (2016) 6
In the past several decades, the standard cosmological model has been established and its parameters have been measured to a high precision, while there are still many of the fundamental questions in cosmology; such as the physics in the very early U
Externí odkaz:
http://arxiv.org/abs/1603.01959
Autor:
Hasegawa, Kenji, Asaba, Shinsuke, Ichiki, Kiyotomo, Inoue, Akio K., Inoue, Susumu, Ishiyama, Tomoaki, Shimabukuro, Hayato, Takahashi, Keitaro, Tashiro, Hiroyuki, Yajima, Hidenobu, Yokoyama, Shu-ichiro, Yoshikawa, Kohji, Yoshiura, Shintaro
Cosmic reionization is known to be a major phase transition of the gas in the Universe. Since astronomical objects formed in the early Universe, such as the first stars, galaxies and black holes, are expected to have caused cosmic reionization, the f
Externí odkaz:
http://arxiv.org/abs/1603.01961
We present a new numerical scheme to solve the transfer of diffuse radiation on three-dimensional mesh grids which is efficient on processors with highly parallel architecture such as recently popular GPUs and CPUs with multi- and many-core architect
Externí odkaz:
http://arxiv.org/abs/1410.0763
We present a scheme for numerical simulations of collisionless self-gravitating systems which directly integrates the Vlasov--Poisson equations in six-dimensional phase space. By the results from a suite of large-scale numerical simulations, we demon
Externí odkaz:
http://arxiv.org/abs/1206.6152
(Abridged) We have developed a numerical software library for collisionless N-body simulations named "Phantom-GRAPE" which highly accelerates force calculations among particles by use of a new SIMD instruction set extension to the x86 architecture, A
Externí odkaz:
http://arxiv.org/abs/1203.4037