Zobrazeno 1 - 10
of 60
pro vyhledávání: '"Umpei Miyamoto"'
Autor:
Umpei Miyamoto
Publikováno v:
Journal of High Energy Physics, Vol 2017, Iss 6, Pp 1-25 (2017)
Abstract The Einstein equations describing the black-brane dynamics both in Minkowski and AdS background were recently recast in the form of coupled diffusion equations in the large-D(imension) limit. Using such results in the literature, we formulat
Externí odkaz:
https://doaj.org/article/274acfe515d14a2fbaa41bceb61878d4
Autor:
Kenta Hioki, Umpei Miyamoto
Publikováno v:
Physical Review D. 107
We revisit the classic system of a spherically symmetric black hole in general relativity (i.e., a Schwarzschild black hole) surrounded by a geometrically thin accretion disk. Our purpose is to examine whether one can determine three parameters of th
Autor:
Miyuki Koiso, Umpei Miyamoto
Publikováno v:
JSIAM Letters (Online); 2023, Vol. 15, p9-12, 4p
Publikováno v:
Physical Review D. 101
We investigate the escape of photons from the vicinity of the horizon to infinity in the Kerr-Newmann black hole spacetime. We assume that a light source is at rest in a locally nonrotating frame and photons are emitted isotropically. Then, we evalua
Autor:
Umpei Miyamoto
Publikováno v:
Physical Review
We investigate the dynamic Casimir effect (DCE) of a $1+1$ dimensional free massless scalar field in a finite or semi-infinite cavity for which the boundary condition (BC) instantaneously changes from the Neumann to Dirichlet BC or reversely. While t
Autor:
Hajime Sotani, Umpei Miyamoto
Publikováno v:
Physical Review D. 98
Gravitational light bending by compact stars is an important astrophysical phenomenon. The bending angle depends on the stellar compactness, which is the ratio of stellar mass $M$ to radius $R$. In this paper, we investigate the pulse profile of high
Autor:
Umpei Miyamoto, Hajime Sotani
We systematically study pulsar light curves, taking into account the special relativistic effect, i.e., the Doppler factor due to the fast spin of the neutron stars, together with the time delay, which comes from the difference of the travel times de
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b72ab0fe7b8f73c8049ad4e3d9a86b6f
Autor:
Umpei Miyamoto, Hajime Sotani
In order to examine the pulse profile from a pulsar, we derive the formula for describing the flux from antipodal hot spots with any static, spherically symmetric spacetime. We find that the pulse profiles are almost independent of the gravitational
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6a92782e705f4736eb3edfbb974311a6
http://arxiv.org/abs/1710.08581
http://arxiv.org/abs/1710.08581
Autor:
Masashi Ohkawa, Rina Gondo, Hideki Asada, Masaru Shibata, F. Kawazoe, Shinichi Nakasuka, Ken-ichi Nakao, Atsushi J. Nishizawa, Ryo Saito, Yoshiyuki Obuchi, Hirotaka Takahashi, Keisuke Taniguchi, Takehiko Ishikawa, Takeshi Chiba, Fuminobu Takahashi, Akito Araya, Naoki Seto, Naoko Kishimoto, Tatsuaki Hashimoto, Motohiro Enoki, Tomohiro Harada, Koh Suke Aoyanagi, Shinji Tsujikawa, Yasufumi Kojima, K. Okada, Takahiro Tanaka, Umpei Miyamoto, Mitsuhiro Fukushima, Yoshito Niwa, Mutsuko Y. Morimoto, Yoshinori Nakayama, Shin-ichiro Sakai, Shijun Yoshida, Keiko Kokeyama, Hajime Sotani, Akitoshi Ueda, Shigeo Nagano, Masa-aki Sakagami, Hideyuki Horisawa, Yaka Wakabayashi, Wataru Kokuyama, Morio Toyoshima, Kei Kotake, Hisa-aki Shinkai, Takashi Nakamura, Norio Okada, Motoyuki Saijo, Hiroo Kunimori, Toshiyuki Morisawa, Takeshi Ikegami, Taizoh Yoshino, Hiroyuki Tashiro, Wataru Hikida, Kazuhiro Yamamoto, Masa Katsu Fujimoto, Kimio Tsubono, Kazuhiro Agatsuma, Yoshihide Kozai, Hideyuki Tagoshi, Shinji Miyoki, Shuichi Sato, Shihori Sakata, Toshifumi Futamase, S. Eguchi, Nobuyuki Matsumoto, Keitaro Takahashi, Mizuhiko Hosokawa, Hideki Ishihara, Naoko Ohishi, Mitsuru Musha, Takashi Hiramatsu, Hiroyuki Ito, Rieko Suzuki, Hiroyuki Nakano, Kakeru Takahashi, Ikkoh Funaki, Yoichi Aso, Kazunori Shibata, Ayumi Shimo-oku, Yuta Michimura, Kiyotomo Ichiki, Takeshi Takashima, A. Shoda, Yasuo Torii, Sachiko Kuroyanagi, Ken-ichi Oohara, Kaiki Taro Inoue, Yoshiharu Eriguchi, Kazunori Kohri, Shinya Kanemura, Misao Sasaki, Tomotada Akutsu, Tadashi Takano, Naoshi Sugiyama, Nobuki Kawashima, K. Izumi, Takashi Sato, Hiroyuki Koizumi, Kazuhiro Nakazawa, Seiji Kawamura, Chul-Moon Yoo, Koji Arai, Osamu Miyakawa, Nobuyuki Tanaka, Takamori Akiteru, Koki Okutomi, Yudai Suwa, Kentaro Somiya, Jun'ichi Yokoyama, Hisashi Hirabayashi, Hideo Matsuhara, Masayoshi Utashima, Kent Yagi, Masaki Ando, Ryuichi Takahashi, Toshikazu Ebisuzaki, Toshitaka Yamazaki, Kazuhiro Hayama, Norichika Sago, Shinji Mukohyama, Yumiko Ejiri, Shiho Kobayashi, Shigenori Moriwaki, Ken-ichi Ueda, Yoshiaki Himemoto, Keiichi Maeda, Taiga Noumi, Hitoshi Kuninaka, Kunihito Ioka, Feng-Lei Hong, Kazuaki Kuroda, Naoki Aritomi, E. Nishida, Dan Chen, Ryutaro Takahashi, Atsushi Taruya, Isao Kawano, A. Suemasa, Ryuichi Fujita, Hideharu Ishizaki, Nobuyuki Kanda, Kenta Kiuchi, Kouji Nakamura, T. Ushiba, Yousuke Itoh
Publikováno v:
International Journal of Modern Physics D. 28(12):1845001
DECi-hertz Interferometer Gravitational-wave Observatory (DECIGO) is a future Japanese space gravitational-wave antenna. The most important objective of DECIGO, among various sciences to be aimed at, is to detect gravitational waves coming from the i
Publikováno v:
Physical Review D. 94
We propose a consistent analytic approach to the efficiency of collisional Penrose process in the vicinity of a maximally rotating Kerr black hole. We focus on a collision with arbitrarily high center-of-mass energy, which occurs if either of the col