Updated on 2024/05/13

写真a

 
Tomizawa Shinya
 
Organization
Graduate School of Engineering Department of Advanced Science and Technology Materials Science and Engineering Mathematical Physics Laboratory Professor   
Degree
博士（理学） （ 東京工業大学 ）
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Contact information
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Research Areas

  • Natural Science / Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics

Main research papers

  • Construction and application of variations on the cylindrical gravitational waves of Weber, Wheeler, and Bonnor

    T. Mishima, S. Tomizawa

    Physical Review D   96 ( 2 )   024023   2017

    Supersymmetric black lenses in five dimensions

    S. Tomizawa, M. Nozawa

    Physical Review D   94 ( 4 )   044037   2016

    New approach to solution generation using SL(2,R)-duality of a dimensionally reduced space in five-dimensional minimal supergravity and new black holes

    S. Mizoguchi, S. Tomizawa

    Physical Review D   84   104009   2011

    Uniqueness theorem for charged rotating black holes in five-dimensional minimal supergravity

    S. Tomizawa, Y. Yasui, A. Ishibashi

    Physical Review D   79   124023   2009

    Topology Change of Coalescing Black Holes on Eguchi-Hanson Space

    H. Ishihara, M. Kimura, S. Tomizawa

    Classical and Quantum Gravity   23   L89   2006

Research History

  • Toyota Technological Institute   Mathematical Physics Laboratory   Professor

    2020.4

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    Country：Japan

  • Tokyo University of Technology   Department of Liberal Arts   Associate Professor

    2014.4 - 2020.3

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    Country：Japan

  • Ibaraki University   Associate Professor

    2012.4 - 2014.3

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    Country：Japan

  • High Energy Accelerator Research Organization   Institute of Particle and Nuclear Studies

    2011.7 - 2012.3

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    Country：Japan

  • High Energy Accelerator Research Organization   Institute of Particle and Nuclear Studies

    2011.4 - 2011.6

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    Country：Japan

  • ケンブリッジ大学   応用数学・理論物理学研究所（DAMTP）   客員研究員（若手研究者海外派遣事業）

    2010.8 - 2010.10

  • High Energy Accelerator Research Organization   Institute of Particle and Nuclear Studies

    2008.4 - 2011.3

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    Country：Japan

  • Osaka City University

    2005.4 - 2008.3

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    Country：Japan

  • Kyoto University

    2004.10 - 2004.12

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Education

  • Tokyo Institute of Technology   Graduate School of Science and Engineering

    2002.4 - 2005.3

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    Country： Japan

  • Tokyo Institute of Technology

    2000.4 - 2002.3

  • Tokyo Institute of Technology   School of Science

    1996.4 - 2000.3

Professional Memberships

  • 素粒子論ブループ

    2010.4

  • 理論天文学宇宙物理学懇談会

    2005.4

  • 日本物理学会

    2003.4

  • 一般相対論と重力グループ（JGRG）

    2003.4

Committee Memberships

  • 日本物理学会 大学の物理教育編集委員会   委員  

    2021.4 - 2022.3   

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    Committee type：Academic society

  • 日本物理学会 Jr. セッション   第 1 次審査審査員  

    2021.1 - 2021.3   

  • 日本学術振興会 科学研究費委員会   専門委員 [基盤(C)] (素粒子、原子核、宇宙線および宇宙物理に関連する理論)  

    2020.12 - 2021.11   

  • 愛知大学 昇格人事審査委員会   外部委員  

    2020.10 - 2020.11   

  • 日本物理学会 大学の物理教育編集委員会   副委員長  

    2020.4 - 2021.3   

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    Committee type：Academic society

  • 日本物理学会 Jr. セッション   第 1 次審査審査員  

    2020.1 - 2020.3   

  • 日本学術振興会 卓越研究員候補者選考委員会   書面審査員  

    2019.7 - 2020.6   

  • 日本学術振興会 国際事業委員会   書面審査員・書面評価員  

    2019.7 - 2020.6   

  • 日本学術振興会 特別研究員等審査会   専門委員  

    2019.7 - 2020.5   

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    https://www.jsps.go.jp/file/storage/general/j-pd/data/senmon_hyosholist/2019manryousenmon.pdf

  • 日本物理学会 刊行委員会   委員  

    2019.4 - 2020.3   

  • 日本物理学会 大学の物理教育編集委員会   委員長  

    2019.4 - 2020.3   

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    Committee type：Academic society

  • 日本物理学会 Jr. セッション   第 1 次審査審査員  

    2019.1 - 2019.3   

  • 東邦大学医療センター 大森病院倫理委員会   外部委員  

    2018.4 - 2020.3   

  • 日本物理学会 大学の物理教育編集委員会   副委員長  

    2018.4 - 2019.3   

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    Committee type：Academic society

  • 茨城大学大学院理工学研究科 博士 (理学) 学位論文等審査委員会   外部委員  

    2018.1 - 2019.3   

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Research theme

  • Quantum black holes

    富沢　真也, 鈴木　良拓

    2022

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    Outcome：

    2023
    General relativity coupled to nonlinear electrodynamics is known to have nonsingular black hole solutions. We have investigated the existence conditions for such solutions in two-parameter Lagrangian L(F,G). In particular, we have obtained a criterion on the Lagrangian for the existence of nonsingular black hole with a dyonic charge. In addition, we have presented a simple example of two-parameter Lagrangian satisfying the criterion, in which the existence of the dyonic solution is actually confirmed. Moreover, apart from the actual existence of dyonic solutions, we have considered some examples for the Lagrangian satisfying such a criterion.

    2022
    We have investigated the bound orbits of massive/massless, neutral particles and photons moving around regular black holes of Fan and Wang. For massive particles, we have shown the existence of stable/unstable circular orbits and the charge dependence of the radius of the innermost stable circular orbit. Remarkably, we found an unstable circular orbit of photons inside the event horizon. For massless particles and photons, we have shown that both stable and unstable circular orbits can exist in a regular and horizonless spacetime with a slight overcharge. Then, we also discussed the periapsis shift of massive neutral particles orbiting around the black hole, and showed that the charge gives a negative correction to the shift for black holes with small nonlinearity of electrodynamics.

  • Analog black holes

    富沢　真也, 鈴木　良拓

    2022

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    Outcome：

    2023
    We proposed a new simple model of acoustic black hole in a thin tube, where the difference in the gravitational potential is used to create a transonic flow. The main merit of our transonic flow model is that the Euler equations can be solved analytically. In fact, we obtained an exact solution to the equation in terms of a height function in the monatomic case. For a more general case, we found that it takes a simple form by the near-sonic approximation. Moreover, we obtained two analytic solutions describing a backward wave and a forward wave, from which we confirmed the existence of sonic horizons.

  • 高次元極限法を用いたEinstein-Gauss-Bonnet理論におけるブラックホールの理論的研究

    富沢　真也, 鈴木　良拓

    2021

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    　Einsteinの一般相対性理論を拡張したEinstein-Gauss-Bonnet理論におけるブラックホール解を高次元極限法を用いて、理論的に解析する。特にこれまで解析が数値解や摂動解などに限られていた回転ブラックホール解の1/D展開を用いた解析解の導出および安定性解析などを行う。

    Outcome：

    2023
    We have investigated the nonlinear dynamics of D=2N+3 Myers-Perry black holes with almost equal angular momenta, which have N equal spins out of possible N+1 spins. In particular, we have studied the ultraspinning instability and the fate of its nonlinear evolution using the large D effective theory approach. We have found that every stationary phase can be mapped to the counterpart in the singly rotating phase within the leading order effective theory. From the known results of singly rotating solutions, we have obtained the phase diagram of almost equally rotating black holes. We have also obtained a certain implication for the possible topology changing transition.

    2022
    The phase and stability of black strings in the Einstein-Gauss-Bonnet (EGB) theory are investigated by using the large D effective theory approach. The spacetime metric and thermodynamics are derived up to the next-to-leading order (NLO) in the 1/D expansion. We found that the entropy current defined by the Iyer-Wald formula follows the second law. As in the Einstein theory, the entropy difference from the total mass produces an entropy functional for the effective theory. Including the NLO correction, we found that for the large Gauss-Bonnet coupling constant, the Gregory-Laflamme instability of uniform black strings needs longer wavelength. Moreover, we showed that the critical dimension, beyond which non-uiform black strings becomes more stable than uniform ones, increases as α becomes large, and approaches to a finite value for α→∞.

  • ブラックホールおよびmicrostate geometryの周りの粒子と光の運動

    富沢　真也, 鈴木　良拓

    2021

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    　近年、超重力理論の解であるMicrostate geometryが、近似的にブラックホールの幾何学的構造を記述することから、ブラックホールの情報損失問題の解決という観点から世界的に注目されている.しかし、こうした解が、現実の宇宙にあるブラックホールを記述するかどうかは、現時点で不明である．これを明らかにするため、Microstate geometryの古典的な物理的性質（安定性、熱力学、光や粒子の挙動、重力レンズ効果、重力波放射、ホーキング輻射など）について解析を行っている．

    Outcome：

    2023
    Using the exact solution that describes multi-centered rotating black holes, recently discovered by Teo and Wan, we have investigated the innermost stable circular orbit (ISCO) for massive particles and the circular orbit for massless particles moving around a spinning black hole binary. We assume equal masses M1 = M2 = m and equal spin angular momenta |J1| = |J2| for both black holes. Firstly, we have examined the case where two black holes are spinning in the same direction (J1 = J2). We have clarified that that for particles rotating in the same direction as (opposite directions to) black holes’ spin, the greater the spin angular momenta of the black holes, the more the radii of the ISCO for massive particles and the circular orbit for massless particles decrease (increase). We have shown that distinct ISCO transitions occur for particles rotating in the same direction as the black holes in three ranges of spin angular momenta: 0 < J1/m^2 = J2/m^2 < 0.395..., 0.395... < J1/m^2 = J2/m^2 < 0.483..., and 0.483 . . . < J1/m^2 = J2/m^2 < 0.5. Conversely, particles rotating in the opposite direction to the black holes exhibit a consistent transition pattern for the case 0 < J1/m^2 = J2/m^2 < 0.5. Secondly, we study the situation where binary black holes are spinning in opposite directions (J1 = −J2). We have clarified that for large (small) separations between black holes, the ISCO appears near the black hole that is spinning in the same (opposite) direction as particles’ rotation. Additionally, we have shown that different ISCO transitions occur in the three angular momentum ranges: 0 < J1/m^2 = −J2/m^2 < 0.160..., 0.160... < J1/m^2 = −J2/m^2 < 0.467..., and 0.467... < J1/m^2 = −J2/m^2 < 0.5.

    2023
    Recently, various types of the regular black hole model are reintroduced as the solution of the Einstein equations coupled with nonlinear electrodynamics (NED). In NED, it is known that photons do not propagate along the null geodesics of the spacetime geometry, but of so-called effective geometry, which suggests the possibility of so-called “faster/slower than light” photons. We have studied the relation between the causality of photons and the dominant energy condition (DEC) in some static and spherically symmetric black hole spacetimes in NED. We have shown that if photon trajectories with a nonzero angular momentum are timelike in the spacetime geometry, DEC is always satisfied in static and spherically symmetric spacetimes in any NED that admits the Maxwell limit, and vice versa, at least, in the weak field limit. Thus, this implies that in such NED, the violation of DEC admits the existence of faster than light photons.

    2022
    We showed the existence of stable bound orbits for the massive and massless particles moving in the simplest microstate geometry spacetime in the bosonic sector of the five-dimensional minimal supergravity. In our analysis, reducing the motion of particles to a two-dimensional potential problem, we numerically investigated whether the potential has a negative local minimum.

  • Nonlinear gravitational waves in Einstein-Maxwell theory

    富沢　真也

    2020

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    Outcome：

    2023
    Using the ``composite harmonic mapping method," we haveconstructed exact solutions for cylindrically symmetric gravitational and electromagnetic waves within the Einstein-Maxwell system, focusing on the conversion dynamics between these types of waves. In this approach, we have employed two types of geodesic surfaces in H^2_c : (a) the complex line and (b) the totally real Lagrangian plane, applied to two different vacuum seed solutions: (i) a vacuum solution previously utilized in our studies and (ii) the solitonic vacuum solution constructed previously by Economou and Tsoubelis. We have studied three scenarios: case (a) with seeds (i) and (ii), and case (b) with seed (ii). In all cases (a) and (b), solutions demonstrate notable mode conversions near the symmetric axis. In case (a) with seed (i) or seed (ii), we have shown that any change in the occupancy of the gravitational or electromagnetic mode relative to the C-energy near the axis always reverts to its initial state once the wave moves away from the axis. Particularly in case (b) with seed (ii), nontrivial conversions occur even when the wave moves away from the axis. In this case, the amplification factors of electromagnetic modes range from an upper limit of approximately 2.4 to a lower limit of about  0.4, when comparing the contributions of electromagnetic mode to C-energy at past and future null infinities.

    2022
    Applying a simple harmonic map method to the cylindrically symmetric Einstein-Maxwell system, we obtained exact solutions representing strong nonlinear interaction between gravitational waves and electromagnetic waves in the case without any background field. As an interesting fact, we showed that with adjusted parameters the solution represents occurrences of large conversion phenomena in the intense region of fields near the cylindrically symmetric axis.

  • Supersymmetric black lenses in five-dimensional minimal supergravity

    富沢　真也, 鈴木　良拓

    2020

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    Outcome：

    2023
    We have presented the first non-BPS exact solution of an asymptotically flat, stationary spherical black hole having domain of outer communication with nontrivial topology in five-dimensional minimal supergravity. It describes a charged rotating black hole capped by a disc-shaped bubble. The existence of the ``capped black hole'' shows the non-uniqueness of spherical black holes.

    2022
    Applying the inverse scattering method to static and bi-axisymmetric Einstein equations, we constructed a non-rotating black lens inside a bubble of nothing whose horizon is topologically lens space of L(n;1). Using this solution, we discussed whether a static black lens can be in equilibrium by the force balance between the expansion and gravitational attraction.

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Papers

  • Nonlinear dynamics driving the conversion of gravitational and electromagnetic waves in cylindrically symmetric spacetime Reviewed

    Takashi Mishima, Shinya Tomizawa

    Physical Review D, arXiv: 2405.04231[gr-qc]   2024.5

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    Authorship：Last author   Language：English   Publishing type：Research paper (scientific journal)  

  • Innermost stable circular orbits around a spinning black hole binary Reviewed

    Eiki Kagohashi, Ryotaku Suzuki, Shinya Tomizawa

    Physical Review D, arXiv: 2403.18533 [gr-qc]   2024.3

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    Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

  • Solution Generation of a Capped Black Hole Reviewed

    Ryotaku Suzuki, Shinya Tomizawa

    Physical Review D, arXiv: 2403.17796 [hep-th]   2024.3

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    Publishing type：Research paper (scientific journal)  

  • Static equilibrium of multi-black holes in expanding bubbles in five dimensions Reviewed

    Shinya Tomizawa, Ryotaku Suzuki

    Physical Review D, arXiv: 2403.16723 [hep-th]   2024.3

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

  • New construction of a charged dipole black ring by Harrison transformation Reviewed

    Ryotaku Suzuki, Shinya Tomizawa

    Physical Review D   109 ( 8 )   084020   2024.2

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    Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevD.109.084020

  • A Capped Black Hole in Five Dimensions Reviewed

    Ryotaku Suzuki, Shinya Tomizawa

    Physical Review D (Letter), arXiv:2311.11653[hep-th]   2023.11

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    Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： https://doi.org/10.48550/arXiv.2311.11653

  • Causality of Photon Propagation under Dominant Energy Condition in Non-linear Electrodynamics Reviewed

    Shinya Tomizawa, Ryotaku Suzuki

    Physical Review D   108 ( 12 )   124072   2023.9

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    Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)  

    DOI： https://doi.org/10.48550/arXiv.2309.10535

  • Existence conditions of nonsingular dyonic black holes in nonlinear electrodynamics Reviewed

    Ren Tsuda, Ryotaku Suzuki, Shinya Tomizawa

    arXiv:2308.02146[gr-qc]   2023.8

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    Language：English   Publishing type：Research paper (scientific journal)  

  • Dynamics of Myers-Perry black holes with almost equal angular momenta in odd dimensions Reviewed

    Ryotaku Suzuki, Shinya Tomizawa

    Journal of High Energy Physics   10   166   2023.7

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    Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1007/JHEP10(2023)166

  • Acoustic black and white holes of potential flow in a tube Reviewed

    Ren Tsuda, Shinya Tomizawa, Ryotaku Suzuki

    Physical Review D   107 ( 10 )   104020   2023.3 （   ISSN:2470-0010   eISSN:2470-0029 ）

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    Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：American Physical Society (APS)  

    DOI： 10.1103/physrevd.107.104020

    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.107.104020/fulltext

  • Particle motions around regular black holes Reviewed

    Kenshin Isomura, Ryotaku Suzuki, Shinya Tomizawa

    Physical Review D   107 ( 8 )   084003   2023.1 （   ISSN:2470-0010   eISSN:2470-0029 ）

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    Authorship：Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：American Physical Society (APS)  

    We investigate the bound orbits of massive/massless, neutral particles and
    photons moving around regular black holes of Fan and Wang. For massive
    particles, we show the existence of stable/unstable circular orbits and the
    charge dependence of the radius of the innermost stable circular orbit.
    Remarkably, we find an unstable circular orbit of photons inside the event
    horizon. For massless particles and photons, we show that both stable and
    unstable circular orbits can exist in a regular and horizonless spacetime with
    a slight overcharge. Then, we also discuss the periapsis shift of massive
    neutral particles orbiting around the black hole, and show that the charge
    gives a negative correction to the shift for black holes with small
    nonlinearity of electrodynamics.

    DOI： 10.1103/physrevd.107.084003

    Other Link： http://arxiv.org/pdf/2301.10465v2

  • Black lens in a bubble of nothing Reviewed

    Shinya Tomizawa, Ryotaku Suzuki

    Physical Review D   106 ( 12 )   124029   2022.12 （   ISSN:2470-0010   eISSN:2470-0029 ）

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    Authorship：Lead author   Publishing type：Research paper (scientific journal)   Publisher：American Physical Society (APS)  

    DOI： 10.1103/physrevd.106.124029

    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.106.124029/fulltext

  • Phase and stability of black strings in Einstein-Gauss-Bonnet theory at large D Reviewed

    Ryotaku Suzuki, Shinya Tomizawa

    Journal of High Energy Physics   02 ( 101 )   1 - 26   2022.12 （     eISSN:1029-8479 ）

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    Authorship：Last author   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

    The phase and stability of black strings in the Einstein-Gauss-Bonnet (EGB)
    theory are investigated by using the large D effective theory approach. The
    spacetime metric and thermodynamics are derived up to the next-to-leading order
    (NLO) in the 1/D expansion. We find that the entropy current defined by the
    Iyer-Wald formula follows the second law. As in the Einstein theory, the
    entropy difference from the total mass produces an entropy functional for the
    effective theory. Including the NLO correction, we find that for the large
    Gauss-Bonnet coupling constant $\alpha_{\rm GB}$, the Gregory-Laflamme
    instability of uniform black strings needs longer wavelength. Moreover, we show
    that the critical dimension, beyond which non-uiform black strings becomes more
    stable than uniform ones, increases as $\alpha_{\rm GB}$ becomes large, and
    approaches to a finite value for $\alpha_{\rm GB}\to \infty$.

    DOI： 10.1007/JHEP02(2023)101

    Other Link： http://arxiv.org/pdf/2212.04809v3

  • Einstein-Gauss-Bonnet black strings at large α Reviewed

    Ryotaku Suzuki, Shinya Tomizawa

    Journal of High Energy Physics   09 ( 135 )   1 - 26   2022.8 （     eISSN:1029-8479 ）

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    The simplest black string in higher-dimensional general relativity (GR) is
    perhaps the direct product of a Schwarzschild spacetime and a flat spatial
    direction. However, it is known that the Einstein-Gauss-Bonnet theory does not
    allow such a trivial and simple solution. We propose a novel analytic
    technique, which assumes that the Gauss-Bonnet (GB) term becomes dominant over
    the Einstein-Hilbert (EH) term. Assuming the dimensionless coupling constant
    $\alpha$ normalized by the horizon scale is large enough, we find that the
    spacetime is separated into the GB region and GR region, which are matched via
    the transition region where the GB and EH terms are comparable. Using this
    large $\alpha$ approximation, we indeed construct new analytic solutions of
    black strings, from which we analytically compute various physical quantities
    of black strings at large $\alpha$. Moreover, we confirm that all these
    analytic results are consistent with the numerical calculation. We also discuss
    the possible extension to general Einstein-Lovelock black holes.

    DOI： 10.1007/JHEP09(2022)135

    Other Link： http://arxiv.org/pdf/2208.02497v2

  • Stable bound orbits around static Einstein-Gauss-Bonnet black holes Reviewed

    Ryotaku Suzuki, Shinya Tomizawa

    Physical Review D   105 ( 12 )   124033   2022.4 （   ISSN:2470-0010   eISSN:2470-0029 ）

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    Authorship：Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：American Physical Society (APS)  

    As is well-known, asymptotically flat, static and spherically symmetric black
    holes do not admit stable bound orbits of massive/massless particles outside
    the horizon in higher-dimensional Einstein gravity. However, for massive
    particles, this dramatically changes in higher curvature theories. We clarify
    the parameter range such that there exist stable bound orbits in
    $d$-dimensional Einstein-Gauss-Bonnet theories for $6\leq d\leq 9$. In
    particular, we show the existence of the lower bound of the Gauss-Bonnet
    coupling constant below which stable bound orbits cease to exist. Moreover, we
    also find that for AdS-black holes in the theories, there can exist two stable
    circular orbits outside the horizon.

    DOI： 10.1103/PhysRevD.105.124033

    Other Link： http://arxiv.org/pdf/2204.10087v3

  • Rotating black holes at large D in Einstein-Gauss-Bonnet theory Reviewed

    Ryotaku Suzuki, Shinya Tomizawa

    Physical Review D   106 ( 2 )   024018   2022.2 （   ISSN:2470-0010   eISSN:2470-0029 ）

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    Authorship：Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：American Physical Society (APS)  

    Applying the large $D$ approach to the Einstein-Gauss-Bonnet theory, we
    construct equally rotating black hole solutions in odd dimensions. This
    provides the first example of the analytic solutions which describes not-slowly
    rotating black holes. For the next-leading order solutions in the $1/D$
    expansion, we discuss the physical aspects such as thermodynamics and the phase
    diagram.

    DOI： 10.1103/PhysRevD.106.024018

    Other Link： http://arxiv.org/pdf/2202.12649v1

  • Conversion of gravitational and electromagnetic waves without any external background fields Reviewed

    Takashi Mishima, Shinya Tomizawa

    General Relativity and Gravitation   55 ( 5 )   69   2022.2 （   ISSN:0001-7701   eISSN:1572-9532 ）

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    Authorship：Last author   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

    Applying a simple harmonic map method to the cylindrically symmetric
    Einstein-Maxwell system, we obtain exact solutions representing strong
    nonlinear interaction between gravitational waves and electromagnetic waves in
    the case without any background field. As an interesting fact, we can show that
    with adjusted parameters the solutions represent occurrences of large
    conversion phenomena in the intense region of fields near the cylindrically
    symmetric axis.

    DOI： 10.1007/s10714-023-03117-4

    Other Link： http://arxiv.org/pdf/2202.12060v1

  • Squashed black holes at large $D$ Reviewed

    Ryotaku Suzuki, Shinya Tomizawa

    Journal of High Energy Physics   194 ( 12 )   1 - 19   2021.12 （     eISSN:1029-8479 ）

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    Authorship：Last author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

    Using the large $D$ effective theory approach, we construct a static solution
    of non-extremal and squashed black holes with/without an electric charge, which
    describes a spherical black hole in a Kaluza-Klein spacetime with a
    compactified dimension. The asymptotic background with a compactified dimension
    and near-horizon geometry are analytically solved by the $1/D$ expansion.
    Particularly, our work demonstrates that the large $D$ limit can be applied to
    solve the non-trivial background with a compactified direction, which leads to
    a first-order flow equation. Moreover, we show that the extremal limit
    consistently reproduces the known extremal result.

    DOI： 10.1007/JHEP12(2021)194

    Other Link： http://arxiv.org/pdf/2111.04962v2

  • Lower bound for angular momenta of microstate geometries in five dimensions Reviewed

    Shinya Tomizawa

    Physical Review D   104 ( 084022 )   1 - 15   2021.10 （   ISSN:2470-0010   eISSN:2470-0029 ）

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：American Physical Society (APS)  

    DOI： 10.1103/physrevd.104.084022

    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.104.084022/fulltext

  • Stable circular orbits in caged black hole spacetimes Reviewed

    Takahisa Igata, Shinya Tomizawa

    Physical Review D   103 ( 8 )   084011   2021.4 （   ISSN:2470-0010   eISSN:2470-0029 ）

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    DOI： 10.1103/physrevd.103.084011

    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.103.084011/fulltext

  • Stable circular orbits in Kaluza-Klein black hole spacetimes Reviewed

    Shinya Tomizawa, Takahisa Igata

    Physical Review D   103 ( 124004 )   1 - 9   2021.3 （   ISSN:2470-0010   eISSN:2470-0029 ）

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    Reducing motion of particles to a two-dimensional potential problem, we show
    that there are stable circular orbits around a squashed Kaluza-Klein black hole
    with a spherical horizon and multi-Kaluza-Klein black holes with two spherical
    horizons in five dimensions. For a single horizon, we show analytically that
    the radius of an innermost stable circular orbit monotonically depends on the
    size of an extra dimension. For two horizons, the radius of an innermost stable
    circular orbit depends on the separation between two black holes besides the
    size of an extra dimension. More precisely, the set of the stationary points of
    the potential is composed of two branches. For a large separation, stable
    circular orbits exist on the two branches regardless of the size of an extra
    dimension, and in particular, on one branch, the set of stable circular orbits
    is connected for the small extra dimension but has two disconnected parts for
    the large extra dimension. For a small separation, only on one branch it
    exists, and the radius of an innermost stable circular orbit monotonically
    increases with an extra-dimension size.

    DOI： 10.1103/PhysRevD.103.124004

    Other Link： http://arxiv.org/pdf/2103.08581v1

  • Stable bound orbits in black lens backgrounds Reviewed

    Shinya Tomizawa, Takahisa Igata

    Physical Review D   102 ( 124079 )   1 - 14   2020.12 （   ISSN:2470-0010   eISSN:2470-0029 ）

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    DOI： 10.1103/physrevd.102.124079

    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.102.124079/fulltext

  • Stable circular orbits in higher-dimensional multi–black-hole spacetimes Reviewed

    Takahisa Igata, Shinya Tomizawa

    Physical Review D   102 ( 8 )   084003   2020.10 （   ISSN:2470-0010   eISSN:2470-0029 ）

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    DOI： 10.1103/physrevd.102.084003

    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.102.084003/fulltext

  • Stable bound orbits around a supersymmetric black lens Reviewed

    Shinya Tomizawa, Takahisa Igata

    Physical Review D   100 ( 12 )   124031   2019.12 （   ISSN:2470-0010   eISSN:2470-0029 ）

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    DOI： 10.1103/physrevd.100.124031

    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.100.124031/fulltext

  • Multicharged black lens Reviewed

    Shinya Tomizawa

    Physical Review D   100 ( 2 )   024056   2019.7 （   ISSN:2470-0010   eISSN:2470-0029 ）

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    DOI： 10.1103/physrevd.100.024056

    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.100.024056/fulltext

  • Stationary and biaxisymmetric four-soliton solution in five dimensions Reviewed

    Shinya Tomizawa, Takashi Mishima

    Physical Review D   99 ( 10 )   104053   2019.5 （   ISSN:2470-0010   eISSN:2470-0029 ）

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    DOI： 10.1103/physrevd.99.104053

    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.99.104053/fulltext

  • Kaluza-Klein black lens in five dimensions Reviewed

    Shinya Tomizawa

    Physical Review D   98 ( 2 )   024012   2018.7 （   ISSN:2470-0010   eISSN:2470-0029 ）

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    DOI： 10.1103/physrevd.98.024012

    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.98.024012/fulltext

  • Charged black lens in de Sitter space Reviewed

    Shinya Tomizawa

    Physical Review D   97 ( 4 )   044001   2018.2 （   ISSN:2470-0010   eISSN:2470-0029 ）

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    DOI： 10.1103/physrevd.97.044001

    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.97.044001/fulltext

  • Construction and application of variations on the cylindrical gravitational waves of Weber, Wheeler, and Bonnor Reviewed

    Takashi Mishima, Shinya Tomizawa

    Physical Review D   96 ( 2 )   024023   2017.7 （   ISSN:2470-0010   eISSN:2470-0029 ）

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    DOI： 10.1103/physrevd.96.024023

    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.96.024023/fulltext

  • Asymptotically flat multiblack lenses Reviewed

    Shinya Tomizawa, Taika Okuda

    Physical Review D   95 ( 6 )   064021   2017.3 （   ISSN:2470-0010   eISSN:2470-0029 ）

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    DOI： 10.1103/physrevd.95.064021

    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.95.064021/fulltext

  • Supersymmetric black lenses in five dimensions Reviewed

    Shinya Tomizawa, Masato Nozawa

    Physical Review D   94 ( 4 )   044037   2016.8 （   ISSN:2470-0010   eISSN:2470-0029 ）

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    DOI： 10.1103/physrevd.94.044037

    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.94.044037/fulltext

  • Gravitational two solitons in Levi-Cività spacetime Reviewed

    Takahisa Igata, Shinya Tomizawa

    Classical and Quantum Gravity   33 ( 18 )   185005 - 185005   2016.8 （   ISSN:0264-9381   eISSN:1361-6382 ）

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    DOI： 10.1088/0264-9381/33/18/185005

    Other Link： https://iopscience.iop.org/article/10.1088/0264-9381/33/18/185005

  • Nonlinear effects for a cylindrical gravitational two-soliton Reviewed

    Shinya Tomizawa, Takashi Mishima

    Physical Review D   91 ( 12 )   124058   2015.6 （   ISSN:1550-7998   eISSN:1550-2368 ）

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    DOI： 10.1103/physrevd.91.124058

    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.91.124058/fulltext

  • Gravitational solitons in Levi-Cività spacetime Reviewed

    Takahisa Igata, Shinya Tomizawa

    Physical Review D   91 ( 12 )   124008   2015.6 （   ISSN:1550-7998   eISSN:1550-2368 ）

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    DOI： 10.1103/physrevd.91.124008

    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.91.124008/fulltext

  • New cylindrical gravitational soliton waves and gravitational Faraday rotation Reviewed

    Shinya Tomizawa, Takashi Mishima

    Physical Review D   90 ( 4 )   044036   2014.8 （   ISSN:1550-7998   eISSN:1550-2368 ）

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    DOI： 10.1103/physrevd.90.044036

    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.90.044036/fulltext

  • General Kaluza-Klein black holes with all six independent charges in five-dimensional minimal supergravity Reviewed

    Shinya Tomizawa, Shun’ya Mizoguchi

    Physical Review D   87 ( 2 )   024027   2013.1 （   ISSN:1550-7998   eISSN:1550-2368 ）

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    DOI： 10.1103/physrevd.87.024027

    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.87.024027/fulltext

  • Flipped SL(2,R) duality in five-dimensional supergravity Reviewed

    Shun’ya Mizoguchi, Shinya Tomizawa

    Physical Review D   86 ( 2 )   024022   2012.7 （   ISSN:1550-7998   eISSN:1550-2368 ）

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    DOI： 10.1103/physrevd.86.024022

    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.86.024022/fulltext

  • New approach to solution generation using SL(2,R)-duality of a dimensionally reduced space in five-dimensional minimal supergravity and new black holes Reviewed

    Shun'ya Mizoguchi, Shinya Tomizawa

    Physical Review D   84   104009   2011.11

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    DOI： 10.1103/PhysRevD.84.104009

  • Exact Solutions of Higher Dimensional Black Holes Invited Reviewed

    Shinya Tomizawa, Hideki Ishihara

    Progress of Theoretical Physics Supplement   189   7 - 51   2011 （   ISSN:0375-9687 ）

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    DOI： 10.1143/ptps.189.7

  • Uniqueness theorem for Kaluza-Klein black holes in five-dimensional minimal supergravity Reviewed

    Shinya Tomizawa

    Physical Review D   82 ( 10 )   104047   2010.11 （   ISSN:1550-7998   eISSN:1550-2368 ）

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    DOI： 10.1103/physrevd.82.104047

    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.82.104047/fulltext

  • Compactified black holes in five-dimensional U(1)**3 ungauged supergravity

    Shinya Tomizawa

    arxive: 1009.3568 [hep-th]   1   1 - 10   2010.9

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    We present stationary, nonextremal three charge rotating black hole solutions
    in the five-dimensional U(1)^3 ungauged supergravity. At infinity, our
    solutions behave as a four-dimensional flat spacetime with a compact
    extra-dimension and hence describe spherical black holes with Kaluza-Klein
    asymptotics.

    Other Link： http://arxiv.org/pdf/1009.3568v1

  • Uniqueness theorem for charged dipole rings in five-dimensional minimal supergravity Reviewed

    Shinya Tomizawa, Yukinori Yasui, Akihiro Ishibashi

    Physical Review D   81 ( 8 )   084037   2010.4 （   ISSN:1550-7998   eISSN:1550-2368 ）

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    DOI： 10.1103/physrevd.81.084037

    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.81.084037/fulltext

  • Coset for Hopf fibration and squashing Reviewed

    Machiko Hatsuda, Shinya Tomizawa

    Classical and Quantum Gravity   26 ( 22 )   225007 - 225007   2009.10 （   ISSN:0264-9381   eISSN:1361-6382 ）

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    DOI： 10.1088/0264-9381/26/22/225007

  • Topology changing process of coalescing black holes on Eguchi-Hanson space Reviewed

    Masashi Kimura, Hideki Ishihara, Shinya Tomizawa, Chul-Moon Yoo

    Physical Review D   80 ( 6 )   064030   2009.9 （   ISSN:1550-7998   eISSN:1550-2368 ）

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    DOI： 10.1103/physrevd.80.064030

    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.80.064030/fulltext

  • Charged rotating Kaluza–Klein black holes generated by G 2(2) transformation Reviewed

    Shinya Tomizawa, Yukinori Yasui, Yoshiyuki Morisawa

    Classical and Quantum Gravity   26 ( 14 )   145006 - 145006   2009.6 （   ISSN:0264-9381   eISSN:1361-6382 ）

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    DOI： 10.1088/0264-9381/26/14/145006

  • Uniqueness theorem for charged rotating black holes in five-dimensional minimal supergravity Reviewed

    Shinya Tomizawa, Yukinori Yasui, Akihiro Ishibashi

    Physical Review D   79 ( 12 )   124023   2009.6 （   ISSN:1550-7998   eISSN:1550-2368 ）

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    DOI： 10.1103/physrevd.79.124023

    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.79.124023/fulltext

  • Kaluza-Klein-Kerr-Godel Black Holes: Kaluza-Klein Black Holes with Rotations of Black Hole and Universe Reviewed

    S. Tomizawa, H. Ishihara, K. Matsuno, T. Nakagawa

    Progress of Theoretical Physics   121 ( 4 )   823 - 841   2009.4 （   ISSN:0033-068X   eISSN:1347-4081 ）

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    DOI： 10.1143/ptp.121.823

  • Kaluza-Klein-Kerr-Godel Black Holes

    Shinya Tomizawa, Hideki Ishihara, Ken Matsuno, Yoshiharu Nakagawa

    Proceeding of The 18-th Workshop on General Relativity and Gravitation   307 - 310   2008.12

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  • Charged black holes in a rotating Gross–Perry–Sorkin monopole background Reviewed

    Shinya Tomizawa, Akihiro Ishibashi

    Classical and Quantum Gravity   25 ( 24 )   245007   2008.11 （   ISSN:0264-9381   eISSN:1361-6382 ）

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    DOI： 10.1088/0264-9381/25/24/245007

  • Rotating black holes on Kaluza-Klein bubbles Reviewed

    Shinya Tomizawa, Hideo Iguchi, Takashi Mishima

    Physical Review D   78 ( 8 )   084001   2008.10 （   ISSN:1550-7998   eISSN:1550-2368 ）

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    DOI： 10.1103/physrevd.78.084001

    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.78.084001/fulltext

  • Rotating Kaluza-Klein multi-black holes with Gödel parameter Reviewed

    Ken Matsuno, Hideki Ishihara, Toshiharu Nakagawa, Shinya Tomizawa

    Physical Review D   78 ( 6 )   064016   2008.9 （   ISSN:1550-7998   eISSN:1550-2368 ）

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    DOI： 10.1103/physrevd.78.064016

    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.78.064016/fulltext

  • Multi-black rings on Eguchi–Hanson space Reviewed

    Shinya Tomizawa

    Classical and Quantum Gravity   25 ( 14 )   145014 - 145014   2008.6 （   ISSN:0264-9381   eISSN:1361-6382 ）

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    DOI： 10.1088/0264-9381/25/14/145014

  • Horizons of coalescing black holes on the Eguchi–Hanson space Reviewed

    Chul-Moon Yoo, Hideki Ishihara, Masashi Kimura, Ken Matsuno, Shinya Tomizawa

    Classical and Quantum Gravity   25 ( 9 )   095017   2008.4 （   ISSN:0264-9381   eISSN:1361-6382 ）

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    DOI： 10.1088/0264-9381/25/9/095017

  • Boundary value problem for black rings Reviewed

    Yoshiyuki Morisawa, Shinya Tomizawa, Yukinori Yasui

    Physical Review D   77 ( 6 )   064019   2008.3 （   ISSN:1550-7998   eISSN:1550-2368 ）

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    DOI： 10.1103/physrevd.77.064019

    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.77.064019/fulltext

  • Charged rotating Kaluza-Klein black holes in five dimensions Reviewed

    Toshiharu Nakagawa, Hideki Ishihara, Ken Matsuno, Shinya Tomizawa

    Physical Review D   77 ( 4 )   044040   2008.2 （   ISSN:1550-7998   eISSN:1550-2368 ）

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    DOI： 10.1103/physrevd.77.044040

    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.77.044040/fulltext

  • Squashed Kerr-Gödel black holes Reviewed

    Shinya Tomizawa, Hideki Ishihara, Ken Matsuno, Toshiharu Nakagawa

    Proceedings of the 18th Workshop on General Relativity and Gravitation in Japan, JGRG 2008   2008

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    Applying squashing transformation to Kerr-Gödel black hole solutions, we present a new type of a rotating Kaluza-Klein black hole solution to the five-dimensional Einstein-Maxwell theory with a Chern-Simonss term. The new solutions generated via the squashing transformation have no closed timelike curve everywhere outside the black hole horizons. The spacetime is asymptotically locally flat. One of the remarkable features is that the solution has two independent rotation parameters along an extra dimension associated with the black hole's rotation and the Gödel's rotation. The space-time also admits the existence of two disconnected ergoregions, an inner ergoregion and an outer ergoregion. These two ergoregions can rotate in the opposite direction as well as in the same direction.

  • Boosted black holes on Kaluza-Klein bubbles Reviewed

    Hideo Iguchi, Takashi Mishima, Shinya Tomizawa

    Physical Review D   76 ( 12 )   124019   2007.12 （   ISSN:1550-7998   eISSN:1550-2368 ）

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    DOI： 10.1103/physrevd.76.124019

    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.76.124019/fulltext

  • Horizons of Coalescing Black Holes on Eguchi- Hanson Space

    Yoo Chumru, Hideki Ishihara, Masashi Kimura, Ken Matsuno, Shinya Tomizawa

    Proceeding of The 17-th Workshop on General Relativity and Gravitation   301 - 304   2007.12

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  • Black Rings on Eguchi-Hanson Space

    Shinya Tomizawa, Hideki Ishihara, Masashi Kimura, Ken Matsuno

    The 17-th Workshop on General Relativity and Gravitation   273 - 276   2007.12

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  • Uniqueness of Pomeransky-Senkov black ring solution as boundary value problem

    Yoshiyuki Morisawa, Shinya Tomizawa, Yukinorii Yasui

    Proceeding of The 17-th Workshop on General Relativity and Gravitation   341 - 344   2007.12

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  • Stationary solution of black hole - bubble sequence in Kaluza- Klein theory

    Hideo Iguchi, Takashi Mishima, Shinya Tomizawa

    Proceeding of The 17-th Workshop on General Relativity and Gravitation   369 - 372   2007.12

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  • Charged Rotating Kaluza Klein Black Holes in Five Dimensions

    Toshiharu Nakagawa, Hideki Ishihara, Ken Matsuno, Shinya Tomizawa

    Proceeding of The 17-th Workshop on General Relativity and Gravitation   357 - 360   2007.12

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  • Coalescence of Rotating Black Holes on Eguchi-Hanson Space

    Ken Matsuno, Hideki Ishihara, Masashi Kimura, Shinya Tomizawa

    Proceeding of The 17-th Workshop on General Relativity and Gravitation   325 - 329   2007.12

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  • Coalescence of rotating black holes on Eguchi-Hanson space Reviewed

    Ken Matsuno, Hideki Ishihara, Masashi Kimura, Shinya Tomizawa

    Physical Review D   76 ( 10 )   104037   2007.11 （   ISSN:1550-7998   eISSN:1550-2368 ）

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    DOI： 10.1103/physrevd.76.104037

    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.76.104037/fulltext

  • Supersymmetric black rings on Eguchi–Hanson space Reviewed

    Shinya Tomizawa, Hideki Ishihara, Masashi Kimura, Ken Matsuno

    Classical and Quantum Gravity   24 ( 22 )   5609 - 5625   2007.11 （   ISSN:0264-9381   eISSN:1361-6382 ）

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    DOI： 10.1088/0264-9381/24/22/020

  • Cosmological black holes on Taub–NUT space in five-dimensional Einstein–Maxwell theory Reviewed

    Daisuke Ida, Hideki Ishihara, Masashi Kimura, Ken Matsuno, Yoshiyuki Morisawa, Shinya Tomizawa

    Classical and Quantum Gravity   24 ( 13 )   3141 - 3149   2007.6 （   ISSN:0264-9381   eISSN:1361-6382 ）

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    DOI： 10.1088/0264-9381/24/13/001

  • Coalesching Black Holes on Eguchi-Hanson Space

    Shinya Tomizawa, Hideki Ishihara, Masashi Kimura, Ken Matsuno

    Proceeding of Asia-Pacific International Conference on Gravitational and Astrophysics (ICGA8)   98 - 99   2007

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  • Uniquness of Pomeransky-Sen ’kov Black Ring Solution

    Yoshiyuki Morisawa, Shinya Tomizawa, Yukinori Yasui

    Proceeding of Asia-Pacific International Conference on Gravitational and Astrophysics (ICGA8)   62 - 63   2007

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  • Solitonic Generation of Stationary Solutions in Five Dimensional Spacetime

    Hideo Iguchi, Takashi Mishima, Shinya Tomizawa

    Proceeding of Asia-Pacific International Conference on Gravitational and Astrophysics (ICGA8)   40 - 41   2007

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  • Horizons of Coalesching Black Holes in Five Dimensions

    Hideki Ishihara, Masashi Kimura, Ken Matsuno, Shinya Tomizawa, Yoo Chumru

    Proceeding of Asia-Pacific International Conference on Gravitational and Astrophysics (ICGA8)   102 - 103   2007

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  • Five-dimensional Black Holes with a Compact Dimension

    Ken Matsuno, Hideki Ishihara, Masashi Kimura, Shinya Tomizawa

    Proceeding of Asia-Pacific International Conference on Gravitational and Astrophysics (ICGA8)   100 - 101   2007

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    Authorship：Corresponding author   Publishing type：Research paper (international conference proceedings)  

  • Coalescing black holes on Eguchi-Hanson space

    Shinya Tomizawa, Masashi Kimura, Hideki Ishihara

    Proceeding of The;h Workshop on;General Relativity;Gravitation   2006.12

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    Authorship：Lead author   Publishing type：Research paper (international conference proceedings)  

  • Kaluza-Klein Mulit-Black Holes

    Masashi Kimura, Hideki Ishihara, Ken Matsuno, Shinya Tomizawa

    Proceeding of The 16-th Workshop on General Relativity and Gravitation   30 - 33   2006.12

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    Authorship：Last author   Publishing type：Research paper (international conference proceedings)  

  • Topology change of coalescing black holes on Eguchi–Hanson space Reviewed

    Hideki Ishihara, Masashi Kimura, Shinya Tomizawa

    Classical and Quantum Gravity   23 ( 24 )   L89   2006.11 （   ISSN:0264-9381   eISSN:1361-6382 ）

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    Authorship：Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：IOP Publishing  

    DOI： 10.1088/0264-9381/23/24/l02

  • Relationship between solitonic solutions of five-dimensional Einstein equations Reviewed

    Shinya Tomizawa, Hideo Iguchi, Takashi Mishima

    Physical Review D   74 ( 10 )   104004   2006.11 （   ISSN:1550-7998   eISSN:1550-2368 ）

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    Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：American Physical Society (APS)  

    DOI： 10.1103/physrevd.74.104004

    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.74.104004/fulltext

  • Kaluza–Klein multi-black holes in five-dimensional Einstein–Maxwell theory Reviewed

    Hideki Ishihara, Masashi Kimura, Ken Matsuno, Shinya Tomizawa

    Classical and Quantum Gravity   23 ( 23 )   6919 - 6925   2006.10 （   ISSN:0264-9381   eISSN:1361-6382 ）

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    Authorship：Last author   Publishing type：Research paper (scientific journal)   Publisher：IOP Publishing  

    DOI： 10.1088/0264-9381/23/23/019

  • Black holes on Eguchi-Hanson space in five-dimensional Einstein-Maxwell theory Reviewed

    Hideki Ishihara, Masashi Kimura, Ken Matsuno, Shinya Tomizawa

    Physical Review D   74 ( 4 )   047501   2006.8 （   ISSN:1550-7998   eISSN:1550-2368 ）

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    Authorship：Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：American Physical Society (APS)  

    DOI： 10.1103/physrevd.74.047501

    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.74.047501/fulltext

  • Vacuum solutions of five dimensional Einstein equations generated byinverse scattering method. II. Production of the black ring solution Reviewed

    Shinya Tomizawa, Masato Nozawa

    Physical Review D   73 ( 12 )   124034   2006.6 （   ISSN:1550-7998   eISSN:1550-2368 ）

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    Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：American Physical Society (APS)  

    DOI： 10.1103/physrevd.73.124034

    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.73.124034/fulltext

  • Vacuum solutions of five dimensional Einstein equations generated by inverse scattering method Reviewed

    Shinya Tomizawa, Yoshiyuki Morisawa, Yukinori Yasui

    Physical Review D   73 ( 6 )   064009   2006.3 （   ISSN:1550-7998   eISSN:1550-2368 ）

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    Authorship：Lead author   Publishing type：Research paper (scientific journal)   Publisher：American Physical Society (APS)  

    DOI： 10.1103/physrevd.73.064009

    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.73.064009/fulltext

  • Limit structure of future null infinity tangent—topology of the event horizon and gravitational wave tail Reviewed

    Shinya Tomizawa, Masaru Siino

    Classical and Quantum Gravity   23 ( 3 )   683 - 699   2006.1 （   ISSN:0264-9381   eISSN:1361-6382 ）

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    Authorship：Lead author   Publishing type：Research paper (scientific journal)   Publisher：IOP Publishing  

    DOI： 10.1088/0264-9381/23/3/009

  • Measurement of extra dimension by kaluza-Klein black holes

    Ken Matsuno, Hideki Ishihara, Masashi Kimura, Shinya Tomizawa

    Proceedings of the 16th Workshop on General Relativity and Gravitation in Japan, JGRG 2006   26 - 29   2006

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    Authorship：Last author   Publishing type：Research paper (scientific journal)  

    We apply an five-dimensional squashed Kaluza-Klein black hole solution to the outer region of the Earth and consider an evaluating of the size of an extra dimension by a measurement of the geodetic effect with the Gravity Probe B experiment.

  • Solitonic solutions of five dimensional vacuum Einstein equations generated by the inverse scattering method

    Shinya Tomizawa, Yoshiyuki Morisawa, Yukinori Yasui

    Proceeding of The 15-th Workshop on General Relativity and Gravitation   289 - 292   2005.12

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    Authorship：Lead author   Publishing type：Research paper (international conference proceedings)  

  • Kaluza-Klein bubble like structure and celestial sphere in the inflationary universe Reviewed

    Tetsuya Shiromizu, Shinya Tomizawa, Yuki Uchida, Shinji Mukohyama

    General Relativity and Gravitation   37 ( 11 )   1823 - 1831   2005.11 （   ISSN:0001-7701   eISSN:1572-9532 ）

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    Authorship：Last author   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

    DOI： 10.1007/s10714-005-0162-4

    Other Link： http://link.springer.com/article/10.1007/s10714-005-0162-4/fulltext.html

  • Positivity bounds for the Yano-Arnowitt-Deser-Misner mass density Reviewed

    David Kastor, Tetsuya Shiromizu, Shinya Tomizawa, Jennie Traschen

    Physical Review D   71 ( 10 )   104015   2005.5 （   ISSN:1550-7998   eISSN:1550-2368 ）

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    Authorship：Last author   Publishing type：Research paper (scientific journal)   Publisher：American Physical Society (APS)  

    DOI： 10.1103/physrevd.71.104015

    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.71.104015/fulltext

  • Positivity Bounds for the Y-ADM Mass Density

    Shinya Tomizawa, Tetsuya Shiromizu, David Kastor, Jennie Traschen

    Proceeding of The 14-th Workshop on General Relativity and Gravitation   301 - 304   2004.12

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    Authorship：Lead author   Publishing type：Research paper (international conference proceedings)  

  • Twist of a stationary black hole or ring in five dimensions Reviewed

    Shinya Tomizawa, Yuki Uchida, Tetsuya Shiromizu

    Physical Review D   70 ( 6 )   064020   2004.9 （   ISSN:1550-7998   eISSN:1550-2368 ）

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    Authorship：Lead author   Publishing type：Research paper (scientific journal)   Publisher：American Physical Society (APS)  

    DOI： 10.1103/physrevd.70.064020

    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.70.064020/fulltext

  • Spatial infinity in higher dimensional spacetimes Reviewed

    Tetsuya Shiromizu, Shinya Tomizawa

    Physical Review D   69 ( 10 )   104012   2004.5 （   ISSN:1550-7998   eISSN:1550-2368 ）

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    Authorship：Last author   Publishing type：Research paper (scientific journal)   Publisher：American Physical Society (APS)  

    DOI： 10.1103/physrevd.69.104012

    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.69.104012/fulltext

  • Kinematical bound in asymptotically translationally invariant space-times Reviewed

    Tetsuya Shiromizu, Daisuke Ida, Shinya Tomizawa

    Physical Review D   69 ( 2 )   027503   2004.1 （   ISSN:1550-7998   eISSN:1550-2368 ）

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    Authorship：Last author   Publishing type：Research paper (scientific journal)   Publisher：American Physical Society (APS)  

    DOI： 10.1103/physrevd.69.027503

    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.69.027503/fulltext

  • Topological Structure of The Upper End of Future Null Infinity

    Shinya Tomizawa, Masaru Siino

    Proceeding of The 12-th Workshop on General Relativity and Gravitation   400 - 404   2002.12

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    Authorship：Lead author   Publishing type：Research paper (international conference proceedings)  

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MISC

  • 26pSL-1 Novel properties of the new cylindrically symmetric solitonic gravitational waves

    Mishima T., Tomizawa S.

    Meeting Abstracts of the Physical Society of Japan   70.2   370   2015 （     eISSN:2189-0803 ）

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    Language：Japanese   Publisher：The Physical Society of Japan  

    DOI： 10.11316/jpsgaiyo.70.2.0_370

  • New solution-generation-techniques using SL(2, R)-duality and general black holes

    Shinya Tomizawa, Shun’ya Mizoguchi

    The 13th Marcel Grossmann Meeting: On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories - Proceedings of the MG13 Meeting on General Relativity, 2012   ( 210699 )   1327 - 1329   2015

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    Language：English   Publishing type：Article, review, commentary, editorial, etc. (international conference proceedings)   Publisher：World Scientific  

    The dimensional reduction of (the bosonic sector of) five-dimensional minimal supergravity to four dimensions leads to a theory with a massless axion and a dilaton coupled to gravity and two U(1) gauge fields (one of which has Chern-Simons coupling), whose field equations have SL(2, R) invariance. Utilizing this SL(2, R)-duality in the dimensionally reduced spacetime, we provide a new formalism for solution generation. Using the SL(2, R)-duality, we construct general Kaluza-Klein black hole solutions which carry six independent charges, its mass, angular momentum along four dimensions, electric and magnetic charges of the Maxwell fields in addition to Kaluza-Klein electric and magnetic monopole charges.

    DOI： 10.1142/9789814623995_0162

  • 24aZW-11 Rotating Squashed Multi-Black Holes with Godel Parameter

    Matsuno Ken, Ishihara Hideki, Tomizawa Shinya, Nakagawa Toshiharu

    Meeting Abstracts of the Physical Society of Japan   63.1.1   109   2008 （     eISSN:2189-0803 ）

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    Language：Japanese   Publisher：The Physical Society of Japan  

    DOI： 10.11316/jpsgaiyo.63.1.1.0_109_4

  • 23pZH-2 Coalescence of Rotating Black Holes on Eguchi-Hanson space

    Matsuno Ken, Ishihara Hideki, Tomizawa Shinya, Kimura Masashi

    Meeting Abstracts of the Physical Society of Japan   62.2.1   112   2007 （     eISSN:2189-0803 ）

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    Language：Japanese   Publisher：The Physical Society of Japan  

    DOI： 10.11316/jpsgaiyo.62.2.1.0_112_4

  • 21pSG-2 Masses of Kaluza-Klein black holes

    Matsuno Ken, Ishihara Hideki, Tomizawa Shinya, Kimura Masashi

    Meeting Abstracts of the Physical Society of Japan   61.2.1   63   2006 （     eISSN:2189-0803 ）

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    Language：Japanese   Publisher：The Physical Society of Japan  

    DOI： 10.11316/jpsgaiyo.61.2.1.0_63_2

  • Geometry of quantum state space

    Koike Tatsuhiko, Hosoya Akio, Alberto Carlini, Tomizawa Shinya, Sawayama Shintaro

    Meeting Abstracts of the Physical Society of Japan   58.2.2   131   2003 （     eISSN:2189-0803 ）

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    Language：Japanese   Publisher：The Physical Society of Japan  

    DOI： 10.11316/jpsgaiyo.58.2.2.0_131_2

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Presentations

  • 位相検閲定理とブラックホールの非一意性 Invited

    富沢真也, 鈴木良拓

    茨大素粒子Mini Workshop  ( 茨城大学 )   2024.3 

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    Presentation type：Oral presentation (invited, special)  

  • 重力波・電磁波が伝播する円筒対称時空中の試験粒子の挙動

    三島隆, 富沢真也

    日本物理学会　２０２４年春季大会  ( オンライン )   2024.3 

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    Presentation type：Oral presentation (general)  

  • A capped black hole I : Solution generation of spherical black holes

    富沢真也, 鈴木良拓

    日本物理学会　２０２４年春季大会  ( オンライン )   2024.3 

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    Presentation type：Oral presentation (general)  

  • A capped black hole II : Non-uniqueness of spherical black holes

    鈴木良拓, 富沢真也

    日本物理学会　２０２４年春季大会  ( オンライン )   2024.3 

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    Presentation type：Oral presentation (general)  

  • 厳密解を用いた重力的波動現象における非線形効果の探求 Invited

    三島隆、富沢真也

    ブラックホール研究会  ( 日本大学 )   2024.3 

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    Presentation type：Oral presentation (invited, special)  

  • A Capped Black Hole in Five Dimensions Invited

    鈴木良拓、富沢真也

    時空と重力  ( 大阪工業大学 )   2024.3 

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    Presentation type：Oral presentation (invited, special)  

  • Spherical black holes with nontrivial domain of outer communication in D=5 minimal supergravity International conference

    Ryotaku Suzuki, Shinya Tomizawa

    The 32nd Workshop on General Relativity and Gravitation in Japan  ( Nagoya University )   2023.11 

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    Event date： 2023.11 - 2023.12

    Presentation type：Oral presentation (general)  

  • Static Equilibrium of Black Holes inside Expanding Bubble of Nothing International conference

    Shinya Tomizawa, Ryotaku Suzuki, Takashi Mishima

    The 32nd Workshop on General Relativity and Gravitation in Japan  ( Nagoya University )   2023.11 

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    Event date： 2023.11 - 2023.12

    Presentation type：Poster presentation  

  • Conversion phenomena of gravitational and electromagnetic waves propagating through the Melvin magnetic universe International conference

    Takashi Mishima, Shinya Tomizawa

    The 32nd Workshop on General Relativity and Gravitation in Japan  ( Nagoya University )   2023.11 

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    Event date： 2023.11 - 2023.12

    Presentation type：Poster presentation  

  • 位相検閲定理から予想される新しいブラックホールの厳密解

    富沢真也, 鈴木良拓

    東京工業大学・茨城大学 素粒子論研究室合同合宿２０２３  ( レイクロッジヤマナカ )   2023.11 

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    Presentation type：Oral presentation (general)  

  • Existence conditions of nonsingular dyonic black holes in nonlinear electrodynamics

    津田廉, 鈴木良拓, 富沢真也

    東京工業大学・茨城大学 素粒子論研究室合同合宿２０２３  ( レイクロッジヤマナカ )   2023.11 

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    Presentation type：Oral presentation (general)  

  • 磁場付Melvin宇宙上の重力波・電磁波間のモード転換現象の解析

    三島隆, 富沢真也

    日本物理学会　第７８回年次大会  ( 東北大学 )   2023.9 

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    Event date： 2023.9

    Presentation type：Oral presentation (general)  

  • Existence of nonsingular dyonic black holes in nonlinear electrodynamics

    津田廉, 鈴木良拓, 富沢真也

    日本物理学会　第７８回年次大会  ( 東北大学 )   2023.9 

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    Event date： 2023.9

    Presentation type：Oral presentation (general)  

  • Dynamics of Myers-Perry black holes with nearly equal angular momenta at large D

    鈴木良拓, 富沢真也

    日本物理学会　第７８回年次大会  ( 東北大f学 )   2023.9 

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    Event date： 2023.11

    Presentation type：Oral presentation (general)  

  • 指数型非線形電磁気理論における特異点のないブラックホール

    津田廉、鈴木良拓、富沢真也

    第２４回特異点研究会「特異点と時空、および関連する物理」  ( 日本大学 )   2023.8 

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    Event date： 2023.8 - 2023.9

    Presentation type：Oral presentation (general)  

  • Dynamics of Myers-Perry black holes with almost equal angular momenta at large D

    鈴木良拓、富沢真也

    第２４回特異点研究会 「特異点と時空、および関連する物理」  ( 日本大学 )   2023.8 

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    Event date： 2023.8 - 2023.9

    Presentation type：Oral presentation (general)  

  • 円筒対称時空における電磁波-重力波の厳密解を 用いた重力的非線形現象の解析 Invited

    三島隆 、富沢真也

    立教大学理論物理学セミナー  ( 立教大学 )   2023.6 

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    Presentation type：Oral presentation (invited, special)  

  • 特異点のないブラックホール周りの粒子や光の軌道

    磯村健心, 富沢真也, 鈴木良拓

    日本物理学会2023年春季大会  ( オンライン )   2023.3 

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    Presentation type：Oral presentation (general)  

  • 流体ブラックホールの単純模型の提案

    津田廉, 富沢真也, 鈴木良拓

    日本物理学会2023年春季大会  ( オンライン )   2023.3 

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    Presentation type：Oral presentation (general)  

  • Melvinの磁場付宇宙を伝播する重力波・電磁波の振舞いについて

    三島隆, 富沢真也

    日本物理学会2023年春季大会  ( オンライン )   2023.3 

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    Presentation type：Oral presentation (general)  

  • Static Equilibrium of Black Holes inside Expanding Bubble of Nothing

    富沢真也, 鈴木良拓, 三島隆

    日本物理学会2023年春季大会  ( オンライン )   2023.3 

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    Presentation type：Oral presentation (general)  

  • Phase and stability of Einstein-Gauss-Bonnet black strings at large D

    Ryotaku Suzuki, Shinya Tomizawa

    日本物理学会2023年春季大会  ( オンライン )   2023.3 

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    Presentation type：Oral presentation (general)  

  • Effective geometry of regular black holes and photon sphere Invited

    The 5th workshop on "Mathematics and Physics in General Relativity"  ( 大阪公立大学 )   2023.3 

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    Presentation type：Oral presentation (invited, special)  

  • 円筒対称重力波・電磁波転換現象からの一つの予想

    三島隆, 富沢真也

    第２３回特異点研究会 「特異点と時空、および関連する物理」  ( イールーム名駅前 A名古屋（名古屋大学） )   2022.12  名古屋大学

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    Presentation type：Oral presentation (general)  

  • Particle motion around regular black holes

    富沢真也, 鈴木良拓, 磯村謙心

    第２３回特異点研究会「特異点と時空、および関連する物理」  ( イールーム名駅前 A名古屋（名古屋大学） )   2022.12 

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    Presentation type：Oral presentation (general)  

  • Gauss-Bonnet black strings at large D International conference

    鈴木良拓, 富沢真也

    第２３回特異点研究会「特異点と時空、および関連する物理」  ( イールーム名駅前 A名古屋（名古屋大学） )   2022.12  特異点研究会

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    Presentation type：Oral presentation (general)  

  • 流体ブラックホールの単純模型の提案

    津田廉, 富沢真也, 鈴木良拓

    第２３回特異点研究会「特異点と時空、および関連する物理」  ( イールーム名駅前 A名古屋（名古屋大学） )   2022.12 

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    Presentation type：Oral presentation (general)  

  • Stable bound orbits around higher dimensional black holes and microstate geometry

    Shinya Tomizawa, Takahisa Igata*

    茨城大学・東京工業大学素粒子研究室合同研究会2022  ( オンライン )   2022.12  茨城大学・東京工業大学素粒子研究室合同研究会

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    Presentation type：Oral presentation (general)  

  • 流体ブラックホールの単純模型の提案

    津田廉*, 富沢真也

    茨城大学・東京工業大学素粒子研究室合同研究会2022  ( オンライン )   2022.12  茨城大学・東京工業大学素粒子研究室合同研究会

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    Presentation type：Oral presentation (general)  

  • Rotating black holes at large D in Einstein-Gauss-Bonnet theory International conference

    The 31st Workshop on General Relativity and Gravitation (JGRG31)  ( The University of Tokyo )   2022.10  Japan Society of General Relativity and Gravitation (JGRG)

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    Presentation type：Oral presentation (general)  

  • Mode conversion phenomena of the Einstein-Maxwell system in the cylindrically symmetric spacetime by full nonlinearity International conference

    The 31st Workshop on General Relativity and Gravitation (JGRG31)  ( 東京大学 )   2022.10 

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    Presentation type：Oral presentation (general)  

  • A Proposal for Simple Model of Acoustic Black Hole International conference

    The 31st Workshop on General Relativity and Gravitation (JGRG31)  ( 東京大学 )   2022.10 

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    Presentation type：Oral presentation (general)  

  • Stable bound orbits around static Einstein-Gauss-Bonnet black holes

    Ryotaku Suzuki, Tomizawa Shinya

    日本物理学会2022年秋季大会  ( 岡山理科大学 )   2022.9  日本物理学会

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    Presentation type：Oral presentation (general)  

  • Rotating black holes at large D in Einstein-Gauss-Bonnet theory

    Ryotaku Suzuki, Tomizawa Shinya

    日本物理学会2022年秋季大会  ( 岡山理科大学 )   2022.9  日本物理学会

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    Presentation type：Oral presentation (general)  

  • Stable bound orbits around Einstein-Gauss-Bonnet black holes International conference

    23rd International Conference on General Relativity and Gravitation (GR23)  ( オンライン )   2022.8  The International Society on General Relativity and Gravitation

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    Presentation type：Oral presentation (general)  

  • Squashed black holes at large D

    鈴木良拓, 富沢真也

    日本物理学会第77回年次大会  ( オンライン )   2022.3 

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    Presentation type：Oral presentation (general)  

  • Squashed black holes at large D

    鈴木良拓, 富沢真也

    第22回「特異点と時空、および関連する物理」研究会  ( オンライン )   2021.12 

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    Presentation type：Oral presentation (general)  

  • 円筒対称時空解を用いた電磁波重力波の転換現象

    三島隆, 富沢真也

    第22回「特異点と時空、および関連する物理」研究会  ( オンライン )   2021.12 

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    Presentation type：Oral presentation (general)  

  • Squashed black holes at large D International conference

    The 30th Workshop on General Relativity and Gravitation in Japan  ( Online )   2021.12 

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    Presentation type：Oral presentation (general)  

  • Nonlinear behavior of new cylindrically symmetric waves of Einstein-Maxwell system International conference

    The 30th Workshop on General Relativity and Gravitation in Japan  ( Online )   2021.12 

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    Presentation type：Oral presentation (general)  

  • Angular momenta in microstate geometries and black holes in five dimensions International conference

    The 30th Workshop on General Relativity and Gravitation in Japan  ( Online )   2021.12 

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    Presentation type：Oral presentation (general)  

  • Einstein-Maxwell方程式系の新しい円筒対称波解の解析

    三島隆, 富沢真也

    日本物理学会2021年秋季大会  ( オンライン )   2021.9 

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    Presentation type：Oral presentation (general)  

  • Stable bound orbits around five-dimensional black holes Invited

    Shinya Tomizawa

    The 4th workshop on "Mathematics and Physics in General Relativity"  ( Online )   2021.3 

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    Presentation type：Oral presentation (invited, special)  

  • ブラックレンズの安定束縛軌道について

    富沢真也, 伊形尚久

    日本物理学会 第76回年次大会  ( オンライン )   2021.3 

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    Presentation type：Oral presentation (general)  

  • 調和写像によるEinstein-Maxwell系の新しい円筒対称波解の生成

    三島隆, 富沢真也

    日本物理学会 第76回年次大会  ( オンライン )   2021.3 

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    Presentation type：Oral presentation (general)  

  • ブラックレンズとその性質 Invited

    富沢真也

    名古屋大学多弦数理物理学セミナー  ( オンライン )   2020.10 

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    Presentation type：Oral presentation (invited, special)  

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Awards

  • Research highlights of 2006/2007,

    2007   Classical and Quantum Gravity,   Topology change of coalescing black holes on Eguchi-Hanson space,

Grant-in-Aid for Scientific Research