ISHIHARA, Hideki

写真a

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Title

Professor

Laboratory location

Sugimoto Campus

Research Areas 【 display / non-display

cosmology

Research Career 【 display / non-display

  • Cosmology

    (Individual)

    Keyword in research subject:  cosmology, relativity, gravity

Association Memberships 【 display / non-display

  • THE PHYSICAL SOCIETY OF JAPAN

  • International Astronomical Union

Awards & Honors 【 display / non-display

  • Classical and Quantum Gravity Highlights of 2006 and 2007

    2007  

Current Career 【 display / non-display

  • Osaka City University   Graduate School of Science   Mathematics and Physics Course   Professor  

Graduate School 【 display / non-display

  •  
    -
    1985

    Hiroshima University  Graduate School, Division of Natural Science 

Graduating School 【 display / non-display

  •  
    -
    1980

    Shizuoka University   Faculty of Science  

 

Published Papers 【 display / non-display

  • Space gravitational-wave antennas DECIGO and B-DECIGO

    Kawamura Seiji, Nakamura Takashi, Ando Masaki, Seto Naoki, Akutsu Tomotada, Funaki Ikkoh, Ioka Kunihito, Kanda Nobuyuki, Kawano Isao, Musha Mitsuru, Nakazawa Kazuhiro, Sato Shuichi, Takashima Takeshi, Tanaka Takahiro, Tsubono Kimio, Yokoyama Jun'ichi, Agatsuma Kazuhiro, Aoyanagi Koh-suke, Arai Koji, Araya Akito, Aritomi Naoki, Asada Hideki, Aso Yoichi, Chen Dan, Chiba Takeshi, Ebisuzaki Toshikazu, Eguchi Satoshi, Ejiri Yumiko, Enoki Motohiro, Eriguchi Yoshiharu, Fujimoto Masa-Katsu, Fujita Ryuichi, Fukushima Mitsuhiro, Futamase Toshifumi, Gondo Rina, Harada Tomohiro, Hashimoto Tatsuaki, Hayama Kazuhiro, Hikida Wataru, Himemoto Yoshiaki, Hirabayashi Hisashi, Hiramatsu Takashi, Hong Feng-Lei, Horisawa Hideyuki, Hosokawa Mizuhiko, Ichiki Kiyotomo, Ikegami Takeshi, Inoue Kaiki T., Ishihara Hideki, Ishikawa Takehiko, Ishizaki Hideharu, Ito Hiroyuki, Itoh Yousuke, Izumi Kiwamu, Kanemura Shinya, Kawashima Nobuki, Kawazoe Fumiko, Kishimoto Naoko, Kiuchi Kenta, Kobayashi Shiho, Kohri Kazunori, Koizumi Hiroyuki, Kojima Yasufumi, Kokeyama Keiko, Kokuyama Wataru, Kotake Kei, Kozai Yoshihide, Kunimori Hiroo, Kuninaka Hitoshi, Kuroda Kazuaki, Kuroyanagi Sachiko, Maeda Kei-ichi, Matsuhara Hideo, Matsumoto Nobuyuki, Michimura Yuta, Miyakawa Osamu, Miyamoto Umpei, Miyoki Shinji, Morimoto Mutsuko Y., Morisawa Toshiyuki, Moriwaki Shigenori, Mukohyama Shinji, Nagano Shigeo, Nakamura Kouji, Nakano Hiroyuki, Nakao Kenichi, Nakasuka Shinichi, Nakayama Yoshinori, Nishida Erina, Nishizawa Atsushi, Niwa Yoshito, Noumi Taiga, Obuchi Yoshiyuki, Ohishi Naoko, Ohkawa Masashi, Okada Kenshi, Okada Norio, Okutomi Koki, Oohara Kenichi, Sago Norichika, Saijo Motoyuki, Saito Ryo, Sakagami Masaaki, Sakai Shin-ichiro, Sakata Shihori, Sasaki Misao, Sato Takashi, Shibata Masaru, Shibata Kazunori, Shimo-oku Ayumi, Shinkai Hisaaki, Shoda Ayaka, Somiya Kentaro, Sotani Hajime, Suemasa Aru, Sugiyama Naoshi, Suwa Yudai, Suzuki Rieko, Tagoshi Hideyuki, Takahashi Fuminobu, Takahashi Kakeru, Takahashi Keitaro, Takahashi Ryutaro, Takahashi Ryuichi, Takahashi Hirotaka, Akiteru Takamori, Takano Tadashi, Tanaka Nobuyuki, Taniguchi Keisuke, Taruya Atsushi, Tashiro Hiroyuki, Torii Yasuo, Toyoshima Morio, Tsujikawa Shinji, Ueda Akitoshi, Ueda Ken-ichi, Ushiba Takafumi, Utashima Masayoshi, Wakabayashi Yaka, Yagi Kent, Yamamoto Kazuhiro, Yamazaki Toshitaka, Yoo Chul-Moon, Yoshida Shijun, Yoshino Taizoh

    INTERNATIONAL JOURNAL OF MODERN PHYSICS D  28 ( 12 )  2019.09  [Refereed]

    DOI

  • Observability of spherical photon orbits in near-extremal Kerr black holes

    Igata Takahisa, Ishihara Hideki, Yasunishi Yu

    PHYSICAL REVIEW D  100 ( 4 )  2019.08  [Refereed]

    DOI

  • Cohomogeneity-one-string integrability of spacetimes

    Morisawa Yoshiyuki, Hasegawa Soichi, Koike Tatsuhiko, Ishihara Hideki

    CLASSICAL AND QUANTUM GRAVITY  36 ( 15 )  2019.08  [Refereed]

    DOI

  • Cohomogeneity-one-string integrability of spacetimes

    Yoshiyuki Morisawa, Soichi Hasegawa, Tatsuhiko Koike, Hideki Ishihara

    Classs. Quantum Grav. 36, 155009 (2019)  2019.07  [Refereed]

     View Summary

    We present a framework for reducing all possible cohomogeneity-one strings,<br />
    i.e., strings with geometrical symmetry, in a given spacetime to mechanical<br />
    systems, and for analyzing integrability of the systems. As applications, it is<br />
    clarified whether the systems of cohomogeneity-one strings in $AdS_5$, $AdS_5<br />
    \times S^5$, and $AdS_5 \times T^{p,q}$ are integrable or not. This method may<br />
    reveal a different type of hidden symmetry of spacetimes.

  • Homogeneous balls in a spontaneously broken U(1) gauge theory

    Ishihara Hideki, Ogawa Tatsuya

    PHYSICAL REVIEW D  99 ( 5 )  2019.03  [Refereed]

    DOI

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Conference Activities & Talks 【 display / non-display

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Grant-in-Aid for Scientific Research 【 display / non-display

  • Analysis of light ray and polarization towards observational verification of black holes

    Project/Area Number : 24540282  Grant-in-Aid for Scientific Research(C) Representative

    Project Year :

    2012.04
    -
    2017.03
     

     View Summary

    Black hole shadow is expected to be observed if continuous light source is distributed around the black hole. Owing to unstable circular orbits of photon around the black hole, bright ring on the edge of the shadow appears. The radius of the ring is determined by the mass and angular momentum of the black hole.
    We clarified that the radius of a class of bound orbits of photon around the Kerr black hole approaches to the event horizon if the rotation of the black hole becomes maximum. The shear of the congruence of the photon orbits vanishes, then we can observe the photon orbit winding the horizon of the maximally rotating black holes.
    Optical vortices, the wave front is helicoid, carry orbital angular momentum. Using an improved eikonal approximation, we derived equations that describe the orbits of optical vortex. Optical vortex around a rotating black hole differs from the null geodesic by the interaction between the optical vortex and angular momentum of the black hole.

  • research on cosmological nonlinear and non-perturbative gravitational phenomena

    Project/Area Number : 21244033  Grant-in-Aid for Scientific Research(A) Partaker / Other

    Project Year :

    2009.04
    -
    2015.03
     

    Partaker : TANAKA Takahiro, SHIROMIZU Tetsuya, SODA Jiro, MUKOHYAMA Shinji, MATSUBARA Takahiko, TAKAHASHI Fuminobu, CHIBA Takeshi, TSUJIKAWA Shinji, ISHIHARA Hideki, YAMAMOTO Kazuhiro, YAMAGUCHI Masahide

     View Summary

    It is believed that the universe has undergone a stage of accelerated expansion, an inflationary stage, right after the birth, and all the fluctuations that are responsible for the structure of the universe today were generated during this stage. One of the most important issues in cosmology is to understand how these fluctuations have evolved to the large scale structure of the universe such as galaxies through nonlinear and non-perturbative gravitational phenomena. In this project, we have systematically investigated various types of fluctuations, from microscopic quantum fluctuations to macroscopic fluctuations of spacetime, and obtained many world top-class results. These results form an important basis for the future direction of research in cosmology.

  • Higher-Dimensional Black Holes with Non-trivial Asymptotic Structure

    Project/Area Number : 19540305  Grant-in-Aid for Scientific Research(C) Representative

    Project Year :

    2007
    -
    2010
     

     View Summary

    We can obtain exact solutions of Kaluza-Klein black holes with a twisted extra dimension which are asymptotically locally flat in five dimensions. In this type of black holes, we have constructed charged, rotating black holes, and extremal charged multi-black holes. We have investigated physical properties of Kaluza-Klein black holes : topology of horizons, analyticity of horizons, stability of solutions, thermodynamics of black holes, coalescence of black holes, motions of test objects around black holes.

  • Geometrical Structure of Brane Universes

    Project/Area Number : 14540275  Grant-in-Aid for Scientific Research(C) Representative

    Project Year :

    2002
    -
    2005
     

    Partaker : NAKAO Ken-ichi, YASUI Yukinori

     View Summary

    1.Global structure of brane universe models is studied. It is clarified that initial big-bang singularities of homogeneous and isotropic brane universes are point-like, and then there is no horizon problem in the models. It is shown that gravitational waves can propagate apparently faster than the light speed.
    Killing vector fields, which generate isometry group acting on the embedded objects, e.g.branes, in the Minkowski spacetime are classified into 7 families.
    2.Black objects in higher dimensional spacetimes are studied. In the case of an infinitely long matter exists, it is shown that a black-string horizon could appear if the matter distribution is sufficiently thin. It is proposed that the "hyper-hoop conjecture" which is a conjecture about the necessary and sufficient condition for the formation of black hole horizon.
    Black holes with horizons in the shape of squashed 3-dimensional sphere are constructed explicitly. The asymptotic structure is locally flat with a compact dimension.
    3.Motivated by the string theory and M theory, explicit Einstein, metrics are studied. New Einstein metrics on compact spaces are constructed using 5-dimensional anti-de Sitter Kerr black hole. Properties of the metrics are clarified from the point of view of AdS/CFT correspondence.

  • Cosmological Test of Superstring Theories

    Project/Area Number : 13135208  Grant-in-Aid for Scientific Research on Priority Areas Partaker / Other

    Project Year :

    2001
    -
    2006
     

    Partaker : ISHIHARA Hideki, ITO Katsushi, SHIROMIZU Tetsuya, WATABIKI Yoshiyuki, SHIINO Masaru

     View Summary

    The superstring theories have implications in the higher dimensional cosmology. In this research project we have achieved many aspects of black holes in higher dimensional spacetime, evaporation by the Hawking effect. Some of them are purely classical like topology of black hole and the others arequantum information theoretical.
    Also lower dimensional conformal field theory, which is the basis of string theory, and quantum gravity has been investigated by using simulations

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