Zobrazeno 1 - 10
of 65
pro vyhledávání: '"Takamori, Yohsuke"'
Autor:
Saida, Hiromi, Matsui, Sena A., Takeuchi, Tsutomu T., Nishiyama, Shogo, Saitou, Rio, Takamori, Yohsuke, Takahashi, Masaaki
We have performed a parametrized post-Newtonian (PPN) test of a black hole spacetime using observational data of the star S0-2/S2 orbiting the massive black hole at our galactic center Sgr A*. After introducing our PPN model of black hole spacetime,
Externí odkaz:
http://arxiv.org/abs/2408.11284
Autor:
Nishiyama, Shogo, Kara, Tomohiro, Thorsbro, Brian, Saida, Hiromi, Takamori, Yohsuke, Takahashi, Masaaki, Ohgami, Takayuki, Ichikawa, Kohei, Schödel, Rainer
The tremendous tidal force that is linked to the supermassive black hole (SMBH) at the center of our galaxy is expected to strongly subdue star formation in its vicinity. Stars within 1" from the SMBH thus likely formed further from the SMBH and migr
Externí odkaz:
http://arxiv.org/abs/2311.08869
Publikováno v:
International Journal of Modern Physics D Vol. 32, No. 15 (2023) 2350098 (20 pages)
We study the periapsis shift of a quasi-circular orbit in general static spherically symmetric spacetimes. We derive two formulae in full order with respect to the gravitational field, one in terms of the gravitational mass $m$ and the Einstein tenso
Externí odkaz:
http://arxiv.org/abs/2210.07516
Autor:
Igata, Takahisa, Takamori, Yohsuke
Publikováno v:
Phys. Rev. D 105, 124029 (2022)
We consider the periapsis shifts in dark matter distribution with a dense core. We model the dark matter distribution as an isotropic gas sphere, the Emden polytropic sphere of index 5 in general relativity. This model has a parameter range where all
Externí odkaz:
http://arxiv.org/abs/2202.03114
Publikováno v:
International Journal of Modern Physics D Vol. 32, No. 16 (2023) 2350105 (28 pages)
We consider the periapsis shifts of bound orbits of stars on static clouds around a black hole. The background spacetime is constructed from a Schwarzschild black hole surrounded by a static and spherically symmetric self-gravitating system of massiv
Externí odkaz:
http://arxiv.org/abs/2202.00202
Autor:
Takamori, Yohsuke, Naruko, Atsushi, Sakurai, Yusuke, Takahashi, Keitaro, Yamauchi, Daisuke, Yoo, Chul-Moon
A disformal Kerr black hole solution is a rotating black hole solution in a modified gravity theory which breaks the circular condition of spacetime differently from the case of the Kerr spacetime. In this paper, assuming that Sagittarius A* (Sgr A*)
Externí odkaz:
http://arxiv.org/abs/2108.13026
Autor:
Yoo, Chul-Moon, Naruko, Atsushi, Sakurai, Yusuke, Takahashi, Keitaro, Takamori, Yohsuke, Yamauchi, Daisuke
We consider an axion cloud around a black hole with background magnetic fields. We calculate the decay rate of the axion cloud due to the axion-photon conversion associated with the axion-photon coupling. For simplicity, we consider the situation whe
Externí odkaz:
http://arxiv.org/abs/2103.13227
Autor:
Takamori, Yohsuke, Nishiyama, Shogo, Ohgami, Takayuki, Saida, Hiromi, Saitou, Rio, Takahashi, Masaaki
Sagittarius A* (Sgr A*) is the central supermassive black hole with the mass $\sim 4\times 10^6 M_{\odot}$ in the Milky Way and stars are orbiting around it. In May 2018, one of the nearest stars to Sgr A* named S0-2/S2 experienced the pericenter pas
Externí odkaz:
http://arxiv.org/abs/2006.06219
Akademický článek
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Autor:
Saida, Hiromi, Nishiyama, Shogo, Ohgami, Takayuki, Takamori, Yohsuke, Takahashi, Masaaki, Minowa, Yosuke, Najarro, Francisco, Hamano, Satoshi, Omiya, Masashi, Iwamatsu, Atsushi, Takahashi, Mizuki, Gorin, Haruka, Kara, Tomohiro, Koyama, Akinori, Ohashi, Yosuke, Tamura, Motohide, Nagatomo, Schun, Zenko, Tetsuya, Nagata, Tetsuya
The star S0-2, orbiting the Galactic central massive black hole candidate Sgr A*, passed its pericenter in May 2018. This event is the first chance to detect the general relativistic (GR) effect of a massive black hole, free from non-gravitational ph
Externí odkaz:
http://arxiv.org/abs/1910.02632