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PUBLICATIONS & ACTIVITIES

Publications

2026

  1. T. Miyachi, R. Namba, H. Omiya, and N. Oshita, “Spectral instability of parametrized black hole quasinormal modes in the high-overtone limit via the exact WKB analysis,”
    Physical Review D 113(12) (2026).
  2. N. Nakamoto and N. Oshita, “Exceptional lines and excitation of nearly double-pole quasinormal modes: A semianalytic study in the Nariai black hole,”
    Physical Review D 113(10) (2026).
  3. H. Kobayashi, S. Mukohyama, N. Oshita, K. Takahashi, and V. Yingcharoenrat, “Dynamical tidal response of nonrotating black holes: Connecting the Mano-Suzuki-Takasugi formalism and worldline EFT,”
    Physical Review D 113(8) (2026).
  4. D. Watarai, N. Oshita, and D. Tsuna, “Slowly decaying ringdown of a rapidly spinning black hole. II. Inferring the masses and spins of supermassive black holes with LISA,”
    Physical Review D 113(4) (2026).

2025

  1. H. Kobayashi, S. Mukohyama, N. Oshita, K. Takahashi, and V. Yingcharoenrat, “Parametrized tidal dissipation numbers of nonrotating black holes,”
    Physical Review D 112(8) (2025).
  2. S. Tomizuka, H. Kobayashi, N. Oshita, K. Takahashi, and S. Mukohyama, “Quasinormal modes from EFT of black hole perturbations in vector-tensor gravity,”
    Journal of Cosmology and Astroparticle Physics 2025(10), 056 (2025).
  3. N. Oshita, E. Berti, and V. Cardoso, “Unstable Chords and Destructive Resonant Excitation of Black Hole Quasinormal Modes,”
    Physical Review Letters 135(3) (2025).
  4. T. Miyachi, R. Namba, H. Omiya, and N. Oshita, “Path to an exact WKB analysis of black hole quasinormal modes,”
    Physical Review D 111(12) (2025).
  5. N. Oshita and V. Cardoso, “Reconstruction of ringdown with excitation factors,”
    Physical Review D 111(10) (2025).
  6. M. Giesler, S. Ma, K. Mitman, N. Oshita, S. A. Teukolsky, M. Boyle, N. Deppe, L. E. Kidder, J. Moxon, K. C. Nelli, H. P. Pfeiffer, M. A. Scheel, W. Throwe, and N. L. Vu, “Overtones and nonlinearities in binary black hole ringdowns,”
    Physical Review D 111(8) (2025).
  7. D. Saito and N. Oshita, “Remote Hawking-Moss instanton and the Lorentzian path integral,”
    Journal of High Energy Physics 2025(2) (2025).

2024

  1. N. Oshita, K. Takahashi, and S. Mukohyama, “Stability and instability of the black hole greybody factors and ringdowns against a small-bump correction,”
    Physical Review D 110(8) (2024).
  2. E. R. Livine, C. Montagnon, N. Oshita, and H. Roussille, “Scalar Quasi-Normal Modes of a loop quantum black hole,”
    Journal of Cosmology and Astroparticle Physics 2024(10), 037 (2024).
  3. K. Okabayashi and N. Oshita, “Greybody factors imprinted on black hole ringdowns. II. Merging binary black holes,”
    Physical Review D 110(6) (2024).
  4. C. G. A. Barura, H. Kobayashi, S. Mukohyama, N. Oshita, K. Takahashi, and V. Yingcharoenrat, “Tidal Love numbers from EFT of black hole perturbations with timelike scalar profile,”
    Journal of Cosmology and Astroparticle Physics 2024(09), 001 (2024).
  5. V. Cardoso, S. Mukohyama, N. Oshita, and K. Takahashi, “Black holes, multiple propagation speeds, and energy extraction,”
    Physical Review D 109(12) (2024).
  6. N. Oshita, “Greybody factors imprinted on black hole ringdowns: An alternative to superposed quasinormal modes,”
    Physical Review D 109(10) (2024).
  7. N. Oshita, Y. Shoji, and M. Yamaguchi, “Is the Coleman-de Luccia Action Minimum?: An AdS/CFT Approach,”
    Progress of Theoretical and Experimental Physics 2024(6) (2024).

2023

  1. N. Oshita and D. Tsuna, “Slowly decaying ringdown of a rapidly spinning black hole: Probing the no-hair theorem by small mass-ratio mergers with LISA,”
    Physical Review D 108(10) (2023).
  2. N. Oshita and N. Afshordi, “From entropy to echoes: Counting the quasi-normal modes and the quantum limit of silence,”
    Physics Letters B 841, 137901 (2023).
  3. I. Koga, N. Oshita, and K. Ueda, “dS4 universe emergent from Kerr-AdS5 spacetime: Bubble nucleation catalyzed by a black hole,”
    Journal of High Energy Physics 2023(5) (2023).
  4. N. Oshita, “Thermal ringdown of a Kerr black hole: Overtone excitation, Fermi-Dirac statistics and greybody factor,”
    Journal of Cosmology and Astroparticle Physics 2023(04), 013 (2023).
  5. N. Oshita, Y. Shoji, and M. Yamaguchi, “Polychronic tunneling: New tunneling processes experiencing Euclidean and Lorentzian evolution simultaneously,”
    Physical Review D 107(4) (2023).

2022

  1. N. Oshita, H. Motohashi, and S. Noda, “Evaporation of echoing black holes,”
    Physical Review D 106(4) (2022).
  2. I. Koga, N. Oshita, and K. Ueda, “Global study of the scalar quasinormal modes of Kerr-AdS(5) black holes: Stability, thermality, and horizon area quantization,”
    Physical Review D 105(12) (2022).
  3. T. Hayashi, K. Kamada, N. Oshita, and J. Yokoyama, “Vacuum decay in the Lorentzian path integral,”
    Journal of Cosmology and Astroparticle Physics 2022(5) (2022).

2021

  1. N. Oshita, “Ease of excitation of black hole ringing: Quantifying the importance of overtones by the excitation factors,”
    Physical Review D 104(12) (2021).
  2. R. Gregory, I. G. Moss, N. Oshita, and S. Patrick, “Black hole evaporation in de Sitter space,”
    Classical and Quantum Gravity 38(18) (2021).
  3. N. Oshita, N. Afshordi, and S. Mukohyama, “Lifshitz scaling, ringing black holes, and superradiance,”
    Journal of Cosmology and Astroparticle Physics 2021(5) (2021).

2020

  1. N. Oshita, K. Ueda, and M. Yamaguchi, “Vacuum decays around spinning black holes,”
    Journal of High Energy Physics 2020(1), 015 (2020).
    Erratum: Journal of High Energy Physics 2020(10) (2020).
  2. R. Gregory, I. G. Moss, N. Oshita, and S. Patrick, “Hawking-Moss transition with a black hole seed,”
    Journal of High Energy Physics 2020(9) (2020).
  3. T. Hayashi, K. Kamada, N. Oshita, and J. Yokoyama, “On catalyzed vacuum decay around a radiating black hole and the crisis of the electroweak vacuum,”
    Journal of High Energy Physics 2020(8) (2020).
  4. R. Gregory, I. G. Moss, and N. Oshita, “Black holes, oscillating instantons and the Hawking-Moss transition,”
    Journal of High Energy Physics 2020(7) (2020).
  5. N. Oshita, D. Tsuna, and N. Afshordi, “Quantum black hole seismology. I. Echoes, ergospheres, and spectra,”
    Physical Review D 102(2) (2020).
  6. N. Oshita, D. Tsuna, and N. Afshordi, “Quantum black hole seismology. II. Applications to astrophysical black holes,”
    Physical Review D 102(2) (2020).
  7. N. Oshita, “Small-mass naked singularities censored by the Higgs field,”
    Classical and Quantum Gravity 37(7) (2020).
  8. N. Oshita, Q. Wang, and N. Afshordi, “On reflectivity of quantum black hole horizons,”
    Journal of Cosmology and Astroparticle Physics 2020(4) (2020).
  9. J. Abedi, N. Afshordi, N. Oshita, and Q. Wang, “Quantum Black Holes in the Sky,”
    Universe 6(3) (2020).
  10. Q. Wang, N. Oshita, and N. Afshordi, “Echoes from quantum black holes,”
    Physical Review D 101(2) (2020).

2019

  1. N. Oshita, M. Yamada, and M. Yamaguchi, “Compact objects as the catalysts for vacuum decays,”
    Physics Letters B 791, 149-155 (2019).
  2. N. Oshita and N. Afshordi, “Probing microstructure of black hole spacetimes with gravitational wave echoes,”
    Physical Review D 99(4) (2019).

2018

  1. N. Oshita and J. Yokoyama, “Creation of an inflationary universe out of a black hole,”
    Physics Letters B 785, 197-200 (2018).
  2. N. Oshita, “Generalized second law of thermodynamics and cosmological decoherence,”
    Physical Review D 97(2) (2018).

2017

  1. N. Oshita, “The black hole information paradox and highly squeezed interior quantum fluctuations,”
    Classical and Quantum Gravity 34(19) (2017).
  2. N. Oshita and Y.-P. Wu, “Role of spacetime boundaries in a vierbein formulation of gravity,”
    Physical Review D 96(4) (2017).
  3. S. Iso, N. Oshita, R. Tatsukawa, K. Yamamoto, and S. Zhang, “Quantum radiation produced by the entanglement of quantum fields,”
    Physical Review D 95(2) (2017).

2016

  1. N. Oshita and J. Yokoyama, “Entropic interpretation of the Hawking-Moss bounce,”
    Progress of Theoretical and Experimental Physics 2016(5) (2016).
  2. N. Oshita, K. Yamamoto, and S. Zhang, “Quantum radiation produced by a uniformly accelerating charged particle in thermal random motion,”
    Physical Review D 93(8) (2016).

2015

  1. N. Oshita, K. Yamamoto, and S. Zhang, “Quantum radiation from a particle in an accelerated motion coupled to vacuum fluctuations,”
    Physical Review D 92(4) (2015).

2014

  1. N. Oshita, K. Yamamoto, and S. Zhang, “Thermal property in Brownian motion of a particle coupled to vacuum fluctuations,”
    Physical Review D 89(12) (2014).

Selected Talks

  • 2026 “Introduction to Black Hole QNM,” Asymptotics in Astrophysics and Cosmology, RIKEN Kobe Campus, Japan (March 3, 2026)
  • 2025 “Ringing of Black Holes: Probing Near-Horizon Physics,” 50 Years of the Black Hole Information Paradox, Simons Center for Geometry and Physics, New York, USA (November 3, 2025)
  • 2025 “The Ringing of Black Holes: A Probe of Near-Horizon Physics,” Extreme Universe 2025, Yukawa Institute for Theoretical Physics, Kyoto University, Japan (October 29, 2025)
  • 2025 「ブラックホールの響きに潜む普遍性と複雑性」, ブラックホール摂動論研究会, 石川県政記念しいのき迎賓館, 金沢 (August 29, 2025)
  • 2025 “Excitability, Convergence and (In)completeness of Quasi-Normal Modes,” IBS CTPU-CGA 2025 Workshop on Quasi Normal Mode and Black Hole Perturbation, Institute for Basic Science, Daejeon, Korea (May 27, 2025)
  • 2025 “A Black Hole Ringing and Its Universality,” Gravitational Waves Related Workshop in Western Japan, Kotohira, Kagawa, Japan (March 4, 2025)
  • 2025 “Introduction to Black Hole Quasinormal Modes,” Asymptotics in Astrophysics iTHEMS Workshop, RIKEN IIB, Kobe, Japan (February 26, 2025) [Tutorial code]
  • 2024 “Lorentzian Approach to the Path Integral,” International Workshop on Functional Determinants, Jožef Stefan Institute, Slovenia (online, January 30, 2024)
  • 2023 “Universality in the Black Hole Ringdown,” Black Hole and Gravitational Waves: From Modified Theories of Gravity to Data Analysis, APCTP, Korea (September 5, 2023)
  • 2023 “Black Hole Ringdown” (lecture), CAS-JSPS-IBS CTPU-CGA 2023 Summer Workshop on Cosmology, Gravity, and Particle Physics, Lake Shikotsu, Hokkaido, Japan (August 31, 2023)
  • 2023 “Echoes and Entropy of Quantum Black Holes,” Quantum Spacetime in the Cosmos: From Conception to Reality, Perimeter Institute for Theoretical Physics, Canada (May 11, 2023)
  • 2023 「ブラックホールの響きによる重力の検証」, 第17回中村誠太郎賞受賞講演, 日本物理学会年次大会 (online, March 22, 2023)
  • 2022 “Lorentzian Description of Vacuum Decay,” PPP2022（素粒子物理学の進展2022）, Kyoto, Japan (hybrid, August 30, 2022)
  • 2022 「ブラックホール準固有振動の多重モードの励起について」, 第4回ブラックホール研究会, Rikkyo University, Japan (March 29, 2022)
  • 2021 “Black Hole Overtones and Their Significance,” String Theory, Gravity and Cosmology, POSCO International Center, Korea (online, November 19, 2021)
  • 2021 “Black Hole Ringing and Overtones,” Black Holes Inside and Out (online, October 1, 2021)
  • 2021 “Can We Probe the Microstates of Spacetime?”, Recent Progress of Theoretical Physics Based on Quantum Information Theory, Yukawa Institute for Theoretical Physics, Japan (online, March 2, 2021)
  • 2020 “Cosmological Consequences of Quantum Black Holes,” String Theory, Gravity and Cosmology 2020, APCTP, Korea (online, November 19, 2020)
  • 2020 “Quantum Black Hole Seismology,” Echoes in Southern Ontario, Perimeter Institute, Canada (February 24, 2020)
  • 2017 “Creation of an Inflationary Universe Out of an Evaporating Black Hole,” NCTS Workshop on Dark Matter, Particles and Cosmos, National Dong Hwa University, Taiwan (October 16, 2017)
  • 2016 “Hawking Radiation from the Viewpoint of the Inflationary Universe and Laser Cosmology,” First CORE-U International Conference: Intense Fields and Extreme Universe, Hiroshima University, Japan (March 8, 2016)

Awards

  • 2024 The 15th RIKEN Research Incentive Award (桜舞賞) , RIKEN — “Study of Quasi-Normal Modes of Rotating Black Holes” (March 12, 2024)
  • 2022 第17回中村誠太郎賞(The 17th Seitaro Nakamura Prize) , 素粒子奨学会 「ブラックホールの準固有振動の励起因子に関する研究」 (September 23, 2022)
  • 2021 Best Poster Award, Black Holes Inside and Out 2021 (September 28, 2021) [Plenary talk]
  • 2019 理学系研究科研究奨励賞 受賞対象課題 「ブラックホールの量子論的性質に関する研究」 (東京大学理学系研究科 March 25, 2019)
  • 2015 Outstanding Presentation Award, Gold Prize, The 25th Workshop on General Relativity and Gravitation (December 11, 2015)

Outreach

CONTACT

近畿大学 東大阪キャンパス 31号館 3階 重力物理学研究室
Email: oshita[at]phys.kindai.ac.jp