Masashi Kimura's web page

2025-present : Associate professor, Daiichi Institute of Technology.
2022-2025 : Lecturer, Daiichi Institute of Technology.
2019-2022 : Assistant professor, Institute of Theoretical Physics, Department of Physics, Rikkyo University.
2016-2019 : Postdoc (ERC Fellow), CENTRA, Instituto Superior Tecnico, Universidade de Lisboa (University of Lisbon).
2014-2016 : JSPS postdoc, DAMTP, University of Cambridge.
2011-2014 : JSPS postdoc, Yukawa Institute for Theoretical Physics, Kyoto University.
2010-2014 : Part-time lecturer, Osaka Sangyo University.
2010-2011 : Postdoc, Osaka City University Advanced Mathematical Institute.
2008-2010 : JSPS Research Fellow(DC2), Osaka City University.
2007-2010 : PhD, Osaka City University, Osaka, Japan. 

Publication list

1. Emanuele Berti et al, [including Masashi Kimura],
   "Black hole spectroscopy: from theory to experiment" [review paper],
   arXiv:2505.23895 [gr-qc].

2. Yasutaka Koga, Nobuyuki Asaka, Masashi Kimura, Kazumasa Okabayashi,
   "Shadow formation in gravitational collapse: redshift and blueshift by spacetime dynamics",
   arXiv:2503.11401 [gr-qc].

3. Shin'ichi Hirano, Masashi Kimura, Masahide Yamaguchi,
   "Gravitational mode mixing around black holes in scalar-tensor theories with parity-violating terms",
   Phys.Rev.D.109,124022,2024,
   arXiv:2404.07039 [gr-qc].

4. Shin'ichi Hirano, Masashi Kimura, Masahide Yamaguchi, Jiale Zhang,
   "Parametrized Black Hole Quasinormal Ringdown Formalism for Higher Overtones",
   Phys.Rev.D.110,024015,2024,
   arXiv:2404.09672 [gr-qc].

5. Keisuke Nakashi, Masashi Kimura, Hayato Motohashi, Kazufumi Takahashi,
   "Black hole ringdown from physically sensible initial value problem in higher-order scalar-tensor theories",
   Phys.Rev.D.109,024034,2024,
   arXiv:2310.09839 [gr-qc].

6. Yasuyuki Hatsuda, Masashi Kimura,
   "Perturbative quasinormal mode frequencies",
   Phys.Rev.D.109,044026,2024,
   arXiv:2307.16626 [gr-qc].

7. Takuya Katagiri, Masashi Kimura, Hiroyuki Nakano, Kazuyuki Omukai,
   "Vanishing Love of Black Holes in General Relativity: From Spacetime Conformal Symmetry of a Two-dimensional Reduced Geometry",
   Phys.Rev.D.107,124030,2023,
   arXiv:2209.10469 [gr-qc].

8. Takuya Katagiri, Masashi Kimura,
   "Ladder operators and quasinormal modes in Banados-Teitelboim-Zanelli black holes",
   Phys.Rev.D.106,044052,2022,
   arXiv:2205.15610 [gr-qc].

9. Keisuke Nakashi, Masashi Kimura, Hayato Motohashi and Kazufumi Takahashi,
   "Black hole perturbations in higher-order scalar-tensor theories: initial value problem and dynamical stability",
   Class.Quant.Grav.39:175003,2022,
   arXiv:2204.05054 [gr-qc].

10. Yasutaka Koga, Nobuyuki Asaka, Masashi Kimura, Kazumasa Okabayashi,
    "Dynamical photon sphere and time evolving shadow around black holes with temporal accretion",
    Phys.Rev.D.105.104040,2022,
    arXiv:2202.00201 [gr-qc].

11. Takuya Katagiri, Masashi Kimura,
    "The Aretakis constants and instability in general spherically symmetric extremal black hole spacetimes: higher multipole modes, late-time tails, and geometrical meanings",
    Phys.Rev.D.105.064062,2022,
    arXiv:2112.09832 [gr-qc].

12. Yasuyuki Hatsuda, Masashi Kimura,
    "Spectral Problems for Quasinormal Modes of Black Holes" [review paper],
    Universe 2021, 7(12), 476,
    arXiv:2111.15197 [gr-qc],
    This is a contribution to the special issue "Black Hole Physics and Beyond: From the Ringdown Analysis with Gravitational Waves".

13. Masashi Kimura, Tomohiro Harada, Atsushi Naruko, Kenji Toma,
    "Backreaction of Mass and Angular Momentum Accretion on Black Holes: General Formulation of the Metric Perturbations and Application to the Blandford-Znajek Process",
    Prog.Theor.Exp.Phys.2021,093E03,
    arXiv:2105.05581 [gr-qc].

14. Takuya Katagiri, Masashi Kimura,
    "Revisiting the Aretakis constants and instability in two-dimensional Anti-de Sitter spacetimes",
    Phys.Rev.D.103.064011,2021,
    arXiv:2101.03479 [gr-qc].

15. Keisuke Nakashi, Masashi Kimura,
    "Towards rotating non-circular black holes in string-inspired gravity",
    Phys.Rev.D.102.084021,2020,
    arXiv:2008.04003 [gr-qc].

16. Yasuyuki Hatsuda, Masashi Kimura,
    "Semi-analytic expressions for quasinormal modes of slowly rotating Kerr black holes",
    Phys.Rev.D.102.044032,2020,
    arXiv:2006.15496 [gr-qc].

17. Masashi Kimura,
    "Note on the parametrized black hole quasinormal ringdown formalism",
    Phys.Rev.D.101.064031,2020,
    arXiv:2001.09613 [gr-qc].

18. Vitor Cardoso, Adrian del Rio, Masashi Kimura,
    "Distinguishing black holes from horizonless objects through the excitation of resonances during inspiral",
    Phys.Rev.D.100.084046,2019,
    arXiv:1907.01561 [gr-qc].

19. Ryan McManus, Emanuele Berti, Caio F. B. Macedo, Masashi Kimura, Andrea Maselli, Vitor Cardoso,
    "Parametrized black hole quasinormal ringdown II: Coupled equations and quadratic corrections for nonrotating black holes",
    Phys.Rev.D.100.044061,2019,
    arXiv:1906.05155 [gr-qc].

20. Vitor Cardoso, Masashi Kimura, Andrea Maselli, Emanuele Berti, Caio F. B. Macedo, Ryan McManus,
    "Parametrized black hole quasinormal ringdown I: Decoupled equations for nonrotating black holes",
    Phys.Rev.D.99,104077,2019,
    arXiv:1901.01265 [gr-qc].

21. Masashi Kimura, Takahiro Tanaka,
    "Stability analysis of black holes by the S-deformation method for coupled systems",
    Class.Quant.Grav.36:055005,2019,
    arXiv:1809.00795 [gr-qc].

22. Vitor Cardoso, Masashi Kimura, Andrea Maselli, Leonardo Senatore,
    "Black holes in an Effective Field Theory extension of GR",
    Phys.Rev.Lett.121.251105,2018,
    arXiv:1808.08962 [gr-qc],
    see also https://centra.tecnico.ulisboa.pt/network/grit/news/?id=5271.

23. Masashi Kimura,
    "Stability analysis of Schwarzschild black holes in dynamical Chern-Simons gravity",
    Phys.Rev.D.98,024048,2018,
    arXiv:1807.05029 [gr-qc].

24. Leor Barack et al, [including Masashi Kimura],
    "Black holes, gravitational waves and fundamental physics: a roadmap" [review paper],
    Class.Quant.Grav.36:143001,2019,
    arXiv:1806.05195 [gr-qc],
    selected as "Classical and Quantum Gravity Highlights 2019-20."

25. Masashi Kimura, Takahiro Tanaka,
    "Robustness of S-deformation method for black hole stability analysis",
    Class.Quant.Grav.35:195008,2018,
    arXiv:1805.08625 [gr-qc].

26. Vitor Cardoso, Tsuyoshi Houri, Masashi Kimura,
    "General first-order mass ladder operators for Klein-Gordon fields",
    Class.Quant.Grav.35:015011,2017,
    arXiv:1707.08534 [hep-th].

27. Vitor Cardoso, Tsuyoshi Houri, Masashi Kimura,
    "Mass Ladder Operators from Spacetime Conformal Symmetry",
    Phys.Rev.D.96,024044,2017,
    arXiv:1706.07339 [hep-th].

28. Masashi Kimura,
    "A simple test for stability of black hole by S-deformation",
    Class.Quant.Grav.34:235007,2017,
    arXiv:1706.01447 [gr-qc].

29. Takeshi Chiba, Masashi Kimura,
    "A Note on Geodesics in Hayward Metric",
    Prog.Theor.Exp.Phys.2017,043E01,
    arXiv:1701.04910 [gr-qc].

30. Hideki Ishihara, Masashi Kimura, Ken Matsuno,
    "Charged black strings in a five-dimensional Kasner universe",
    Phys.Rev.D.93,024037,2016,
    arXiv:1511.01913 [hep-th].

31. Mandar Patil, Tomohiro Harada, Ken-ichi Nakao, Pankaj S. Joshi, and Masashi Kimura,
    "Infinite efficiency of the collisional Penrose process: Can a overspinning Kerr geometry be the source of ultrahigh-energy cosmic rays and neutrinos?",
    Phys.Rev.D.93,104015,2016,
    arXiv:1510.08205 [gr-qc].

32. Ken Matsuno, Hideki Ishihara and Masashi Kimura,
    "A pair of extremal charged black holes on Kerr-Taub-bolt space",
    Class.Quant.Grav.32:215008,2015,
    arXiv:1504.04203 [hep-th].

33. Mandar Patil, Pankaj S. Joshi, Ken-ichi Nakao, Masashi Kimura, Tomohiro Harada,
    "Timescale for trans-Planckian collisions in Kerr spacetime,"
    EPL(Europhysics Letters),110(2015),30004,
    arXiv:1503.08331 [gr-qc].

34. Tomohiro Harada and Masashi Kimura,
    "Black holes as particle accelerators: a brief review" [review paper],
    Class.Quant.Grav.31:243001,2014,
    arXiv:1409.7502 [gr-qc]. 

35. Ryo Shiose, Masashi Kimura and Takeshi Chiba,
    "Motion of Charged Particles around a Weakly Magnetized Rotating Black Hole."
    Phys.Rev.D.90,124016,2014,
    arXiv:1409.3310 [gr-qc].

36. Yuki Kanou, Hideki Ishihara, Masashi Kimura, Ken Matsuno and Takamitsu Tatsuoka,
    "Charged Black Holes in a Five-dimensional Kaluza-Klein Universe,"
    Phys.Rev.D.90,084004,2014,
    arXiv:1408.2956 [hep-th].

37. Masashi Kimura, Hideki Ishihara, Ken Matsuno and Takahiro Tanaka,
    "A simple diagnosis of non-smoothness of black hole horizon: Curvature singularity at horizons in extremal Kaluza-Klein black holes,"
    Class.Quant.Grav.32:015005,2015,
    arXiv:1407.6224 [gr-qc].

38. Ken-ichi Nakao, Masashi Kimura, Tomohiro Harada, Mandar Patil, Pankaj S. Joshi,
    "How small can an over-spinning body be in general relativity?"
    Phys.Rev.D.90.124079,2014,
    arXiv:1406.6798 [gr-qc].

39. Naoki Tsukamoto, Masashi Kimura, Tomohiro Harada,
    "High Energy Collision of Particles in the Vicinity of Extremal Black Holes in Higher Dimensions: Banados-Silk-West Process as Linear Instability of Extremal Black Holes,"
    Phys.Rev.D.89.024020,2014,
    arXiv:1310.5716 [gr-qc].

40. Ken-ichi Nakao, Masashi Kimura, Mandar Patil, Pankaj S. Joshi,
    "Ultra-high energy collision with neither black hole nor naked singularity,"
    Phys.Rev.D.87.104033,2013,
    arXiv:1301.4618 [gr-qc].

41. Ken Matsuno, Hideki Ishihara, Masashi Kimura, Takamitsu Tatsuoka,
    "Charged rotating Kaluza-Klein multi-black holes and multi-black strings in five-dimensional Einstein-Maxwell theory, "
    Phys.Rev.D.86.104054,2012,
    arXiv:1208.5536 [hep-th].

42. Ken Matsuno, Hideki Ishihara, Masashi Kimura, Takamitsu Tatsuoka,
    "Kaluza-Klein vacuum multi-black holes in five-dimensions,"
    Phys.Rev.D.86.044036,2012,
    arXiv:1206.4818 [hep-th].

43. Takahisa Igata, Tomohiro Harada, Masashi Kimura,
    "Effect of a Weak Electromagnetic Field on Particle Acceleration by a Rotating Black Hole,"
    Phys.Rev.D.85.104028,2012,
    arXiv:1202.4859 [gr-qc].

44. Takamitsu Tatsuoka, Hideki Ishihara, Masashi Kimura, Ken Matsuno,
    "Extremal Charged Black Holes with a Twisted Extra Dimension,"
    Phys.Rev.D.85.044006,2012,
    arXiv:1110.6731 [hep-th].

45. Tomohiro Harada, Masashi Kimura,
    "Collision of an object in the transition from adiabatic inspiral to plunge around a Kerr black hole,"
    Phys.Rev.D.84.124032,2011,
    arXiv:1109.6722 [gr-qc].

46. Mandar Patil, Pankaj S. Joshi, Masashi Kimura, Ken-ichi Nakao,
    "Acceleration of particles and shells by Reissner-Nordstrom naked singularities,"
    Phys.Rev.D.86.084023,2012,
    arXiv:1108.0288 [gr-qc].

47. Tomohiro Harada, Masashi Kimura,
    "Collision of two general geodesic particles around a Kerr black hole,"
    Phys.Rev.D.83.084041,2011,
    arXiv:1102.3316 [gr-qc].

48. Masashi Kimura, Ken-ichi Nakao and Hideyuki Tagoshi,
    "Acceleration of colliding shells around a black hole: Validity of the test particle approximation in the Banados-Silk-West process,"
    Phys.Rev.D.83.044013,2011,
    arXiv:1010.5438 [gr-qc].

49. Yohsuke Takamori, Ken-ichi Nakao, Hideki Ishihara, Masashi Kimura and Chul-Moon Yoo,
    "Perturbative Analysis of a Stationary Magnetosphere in an Extreme Black Hole Spacetime : On the Meissner-like Effect of an Extreme Black Hole,"
    Mon.Not.R.Astron.Soc.412,2417,2011,
    arXiv:1010.4104 [gr-qc].

50. Tomohiro Harada, Masashi Kimura,
    "Collision of an innermost stable circular orbit particle around a Kerr black hole,"
    Phys.Rev.D83.024002,2011,
    arXiv:1010.0962 [gr-qc].

51. Ryusuke Nishikawa, Masashi Kimura,
    "Stability analysis of squashed Kaluza-Klein black holes with charge,"
    Class.Quant.Grav.27:215020,2010,
    arXiv:1005.1367 [hep-th].

52. Masashi Kimura, Hideki Ishihara, Shinya Tomizawa, Chul-Moon Yoo,
    "Topology Changing Process of Coalescing Black Holes on Eguchi-Hanson Space,"
    Phys.Rev.D80.064030,2009,
    arXiv:0906.4681 [gr-qc].

53. Chul-Moon Yoo, Hideki Ishihara, Masashi Kimura, Sugure Tanzawa,
    "Hoop Conjecture and the Horizon Formation Cross-Section in Kaluza-Klein Spacetimes,"
    Phys.Rev.D81.024020,2010,
    arXiv:0906.0689 [gr-qc].

54. Masashi Kimura,
    "Dynamical Black Rings with a Positive Cosmological Constant,"
    Phys.Rev.D80:044012,2009,
    arXiv:0904.4311 [gr-qc].

55. Sugumi Kanno, Masashi Kimura, Jiro Soda, Shuichiro Yokoyama,
    "Anisotropic Inflation from Vector Impurity,"
    JCAP08(2008)034,
    arXiv:0806.2422 [hep-ph].

56. Masashi Kimura,
    "Analyticity of Event Horizons of Five-Dimensional Multi-Black Holes with Non-Trivial Asymptotic Structure,"
    Phys.Rev.D78:047504,2008,
    arXiv:0805.1125 [gr-qc].

57. Hideki Ishihara, Masashi Kimura, Roman A. Konoplya, Keiju Murata, Jiro Soda and Alexander Zhidenko,
    "Evolution of perturbations of squashed Kaluza-Klein black holes: escape from instability,"
    Phys.Rev.D77:084019,2008,
    arXiv:0802.0655 [hep-th].

58. Masashi Kimura, Keiju Murata, Hideki Ishihara and Jiro Soda,
    "Stability of Squashed Kaluza-Klein Black Holes,"
    Phys.Rev.D77:064015,2008,
    arXiv:0712.4202 [hep-th].

59. Chul-Moon Yoo, Hideki Ishihara, Masashi Kimura, Ken Matsuno and Shinya Tomizawa,
    "Horizons of Coalescing Black Holes on Eguchi-Hanson Space,"
    Class.Quant.Grav.25:095017,2008,
    arXiv:0708.0708 [gr-qc].

60. Ken Matsuno, Hideki Ishihara, Masashi Kimura and Shinya Tomizawa,
    "Coalescence of Rotating Black Holes on Eguchi-Hanson Space,"
    Phys.Rev.D76:104037,2007,
    arXiv:0707.1757 [hep-th].

61. Shinya Tomizawa, Hideki Ishihara, Masashi Kimura and Ken Matsuno,
    "Supersymmetric black rings on Eguchi-Hanson space,"
    Class.Quant.Grav.24:5609-5626,2007,
    arXiv:0705.1098 [hep-th].

62. Daisuke Ida, Hideki Ishihara, Masashi Kimura, Ken Matsuno, Yoshiyuki Morisawa and Shinya Tomizawa,
    "Cosmological black holes on Taub-NUT space in five-dimensional Einstein-Maxwell theory,"
    Class.Quant.Grav.24:3141-3150,2007,
    arXiv:hep-th/0702148.

63. Hideki Ishihara, Masashi Kimura and Shinya Tomizawa,
    "Topology Change of Coalescing Black Holes on Eguchi-Hanson Space,"
    Class.Quant.Grav.23:L89,2006,
    arXiv:hep-th/0609165,
    selected as "Classical and Quantum Gravity Research Highlights of 2006/2007."

64. Hideki Ishihara, Masashi Kimura, Ken Matsuno and Shinya Tomizawa,
    "Black Holes on Eguchi-Hanson Space in Five-Dimensional Einstein-Maxwell Theory,"
    Phys.Rev.D74:047501,2006,
    arXiv:hep-th/0607035.

65. Hideki Ishihara, Masashi Kimura, Ken Matsuno and Shinya Tomizawa,
    "Kaluza-Klein Multi-Black Holes in Five-Dimensional Einstein-Maxwell Theory,"
    Class.Quant.Grav.23:6919-6926,2006,
    arXiv:hep-th/0605030,
    selected as "Classical and Quantum Gravity Research Highlights of 2006/2007."

INSPIRE publication list

INSPIRE 

Reviews [written in Japanese]

1. Tomohiro Harada and Masashi Kimura,
   "Do black holes act as natural particle accelerators?"
   BUTSURI(The Physical Society of Japan),Vol68,No.2,2013,pp102,
   [日本物理学会誌 2013年2月号 pp102-106],
   →pdf file.

Award

1. OCAMI (Osaka City University Advanced Mathematical Institute) Association Special Prize (Mar, 2017).
   (The latest website is here.)

2. EPL(Europhysics Letters) awards for the best presentation at the Asia Pacific School/Workshop (Feb, 2013).

Link

・Rikkyo University >> Institute of Theoretical Physics
・Universidade de Lisboa (University of Lisbon) >> Instituto Superior Tecnico >> CENTRA >> Gravitation in Tecnico (GRIT) group .
・University of Cambridge >> DAMTP >> DAMTP Relativity & Gravitation Group, Centre for Theoretical Cosmology(CTC)
・Kyoto University >> Yukawa Institute for Theoretical Physics
・Osaka City University >> Department of Physics >> Research Group for Theoretical Astrophysics