Publications

INSPIRE_HEP / ADS / Google Scholar

Refereed Journals (Lead-Author)

  1. "Fast Neutrino-Flavor Conversion with Attenuation and Global Lepton Gradient"
    Masamichi Zaizen and Hiroki Nagakura
    Submitted to Phys. Rev. D; arXiv:2604.13617 [astro-ph.HE]
    Movie (Time evolution of flavor conversion in Fig.2)
  2. "Spectral diversity in collisional neutrino-flavor conversion: Flavor equipartition or swap"
    Masamichi Zaizen
    Phys. Rev. D 111, 103029 (2025); arXiv:2502.09260 [hep-ph]
  3. "Inspecting neutrino flavor instabilities during proto-neutron star cooling phase in supernova: I. Spherically symmetric model"
    Masamichi Zaizen, Sherwood Richers, Hiroki Nagakura, Hideyuki Suzuki, and Chinami Kato
    Submitted to Astrophys. J.; arXiv:2407.20548 [astro-ph.HE]
  4. "Fast neutrino-flavor swap in high-energy astrophysical environments"
    Masamichi Zaizen and Hiroki Nagakura
    Phys. Rev. D 109, 083031 (2024); arXiv:2311.13842 [astro-ph.HE]
    Movie (Time evolution of survival probability in Fig.1 and 2)
  5. "Characterizing quasi-steady states of fast neutrino-flavor conversion by stability and conservation laws"
    Masamichi Zaizen and Hiroki Nagakura
    Phys. Rev. D 107, 123021 (2023); arXiv:2304.05044 [astro-ph.HE]
  6. "Simple method for determining asymptotic states of fast neutrino-flavor conversion"
    Masamichi Zaizen and Hiroki Nagakura
    Phys. Rev. D 107, 103022 (2023); arXiv:2211.09343 [astro-ph.HE]
    Movie (Time evolution of polarization vector in Fig.2)
  7. "Nonlinear evolution of fast neutrino flavor conversion in the preshock region of core-collapse supernovae"
    Masamichi Zaizen and Taiki Morinaga
    Phys. Rev. D 104, 083035 (2021); arXiv:2104.10532 [hep-ph]
  8. "Three-flavor collective neutrino conversions with multi-azimuthal-angle instability in an electron-capture supernova model"
    Masamichi Zaizen, Shunsaku Horiuchi, Tomoya Takiwaki, Kei Kotake, Takashi Yoshida, Hideyuki Umeda, and John F. Cherry
    Phys. Rev. D 103, 063008 (2021); arXiv:2011.09635 [astro-ph.HE]
  9. "Neutrino halo effect on collective neutrino oscillation in iron core-collapse supernova model of a 9.6 M⊙ star"
    Masamichi Zaizen, John F. Cherry, Tomoya Takiwaki, Shunsaku Horiuchi, Kei Kotake, Hideyuki Umeda, and Takashi Yoshida
    J. Cosmol. Astropart. Phys. 06 (2020) 011; arXiv:1908.10594 [astro-ph.HE]
    Movie (Time evolution of halo contribution in Fig.4)
  10. "Collective neutrino oscillations and detectabilities in failed supernovae"
    Masamichi Zaizen, Takashi Yoshida, Kohsuke Sumiyoshi, and Hideyuki Umeda
    Phys. Rev. D 98, 103020 (2018); arXiv:1811.03320 [astro-ph.HE]

Refereed Journals (Co-author)

  1. "Dynamic Competition of Fast and Collisional Neutrino Flavor Instabilities with Collisional Damping in Spatially Inhomogeneous Systems"
    Shota Takahashi, Hiroki Nagakura, Masamichi Zaizen, Chinami Kato, and Jiabao Liu
    arXiv:2605.10435 [astro-ph.HE]
  2. "Dynamical equilibria of fast neutrino flavor conversion"
    Jiabao Liu, Lucas Johns, Hiroki Nagakura, Masamichi Zaizen, and Shoichi Yamada
    arXiv:2509.26418 [astro-ph.HE]
  3. "Observing Supernova Neutrino Light Curves with Super-Kamiokande.VI. A Practical Data Analysis Technique Considering Realistic Experimental Backgrounds"
    Fumi Nakanishi, Ken'ichiro Nakazato, Masayuki Harada, Yusuke Koshio, Ryuichiro Akaho, Yosuke Ashida, Akira Harada, Masamitsu Mori, Kohsuke Sumiyoshi, Yudai Suwa, Roger A. Wendell, and Masamichi Zaizen
    Submitted to Astrophys. J.; arXiv:2505.19721 [astro-ph.HE]
  4. "Neutrino Constraints on Black Hole Formation in M31"
    Yudai Suwa, Ryuichiro Akaho, Yosuke Ashida, Akira Harada, Masayuki Harada, Yusuke Koshio, Masamitsu Mori, Fumi Nakanishi, Ken'ichiro Nakazato, Kohsuke Sumiyoshi, Roger A. Wendell, and Masamichi Zaizen
    Submitted to Open Jour. of Astrophys.; arXiv:2504.19510 [astro-ph.HE]
  5. "Asymptotic states of fast neutrino-flavor conversions in the three-flavor framework"
    Jiabao Liu, Hiroki Nagakura, Masamichi Zaizen, Lucas Johns, and Shoichi Yamada
    Phys. Rev. D 111, 123004 (2025); arXiv:2503.18145 [astro-ph.HE]
  6. "Resolution requirements for numerical modeling of neutrino quantum kinetics"
    Hiroki Nagakura, Masamichi Zaizen, Jiabao Liu, and Lucas Johns
    Phys. Rev. D 111, 043028 (2025); arXiv:2501.14145 [astro-ph.HE]
  7. "Quasi-steady evolution of fast neutrino-flavor conversions"
    Jiabao Liu, Hiroki Nagakura, Masamichi Zaizen, Lucas Johns, Ryuichiro Akaho, and Shoichi Yamada
    Phys. Rev. D 111, 023051 (2025); arXiv:2411.08503 [astro-ph.HE]
  8. "Muon-induced collisional flavor instability in core-collapse supernova"
    Jiabao Liu, Hiroki Nagakura, Ryuichiro Akaho, Akira Ito, Masamichi Zaizen, Shun Furusawa, and Shoichi Yamada
    Phys. Rev. D 110, 043039 (2024); arXiv:2407.10604 [hep-ph]
  9. "Bhatnagar-Gross-Krook subgrid model for neutrino quantum kinetics"
    Hiroki Nagakura, Lucas Johns, and Masamichi Zaizen
    Phys. Rev. D 109, 083013 (2024); arXiv:2312.16285 [astro-ph.HE]
  10. "Collisional and fast neutrino flavor instabilities in two-dimensional core-collapse supernova simulation with Boltzmann neutrino transport"
    Ryuichiro Akaho, Jiabao Liu, Hiroki Nagakura, Masamichi Zaizen, and Shoichi Yamada
    Phys. Rev. D 109, 023012 (2024); arXiv:2311.11272 [astro-ph.HE]
  11. "Universality of the neutrino collisional flavor instability in core-collapse supernovae"
    Jiabao Liu, Hiroki Nagakura, Ryuichiro Akaho, Akira Ito, Masamichi Zaizen, and Shoichi Yamada
    Phys. Rev. D 108, 123024 (2023); arXiv:2310.05050 [astro-ph.HE]
  12. "Basic characteristics of neutrino flavor conversions in the post-shock regions of core-collapse supernova"
    Hiroki Nagakura and Masamichi Zaizen
    Phys. Rev. D 108, 123003 (2023); arXiv:2308.14800 [astro-ph.HE]
  13. "Flavor conversions with energy-dependent neutrino emission and absorption"
    Chinami Kato, Hiroki Nagakura, and Masamichi Zaizen
    Phys. Rev. D 108, 023006 (2023); arXiv:2303.16453 [astro-ph.HE]
  14. "Systematic study of the resonancelike structure in the collisional flavor instability of neutrinos"
    Jiabao Liu, Masamichi Zaizen, and Shoichi Yamada
    Phys. Rev. D 107, 123011 (2023); arXiv:2302.06263 [hep-ph]
  15. "Connecting small-scale to large-scale structures of fast neutrino-flavor conversion"
    Hiroki Nagakura and Masamichi Zaizen
    Phys. Rev. D 107, 063033 (2023); arXiv:2211.01398 [astro-ph.HE]
  16. "Time-dependent, quasi-steady, and global features of fast neutrino-flavor conversion"
    Hiroki Nagakura and Masamichi Zaizen
    Phys. Rev. Lett. 129, 261101 (2022); arXiv:2206.04097 [astro-ph.HE]
  17. "Code Comparison for Fast Flavor Instability Simulation"
    Sherwood Richers, Huaiyu Duan, Meng-Ru Wu, Soumya Bhattacharyya, Masamichi Zaizen, Manu George, Chun-Yu Lin, and Zewei Xiong
    Phys. Rev. D 106, 043011 (2022); arXiv:2205.06282 [astro-ph.HE]
  18. "Imaging the Schwarzschild-radius-scale Structure of M87 with the Event Horizon Telescope Using Sparse Modeling"
    Kazunori Akiyama, Kazuki Kuramochi, Shiro Ikeda, Vincent L. Fish, Fumie Tazaki, Mareki Honma, Sheperd S. Doeleman, Avery E. Broderick, Jason Dexter, Monika Moscibrodzka, Katherine L. Bouman, Andrew A. Chael ,and Masamichi Zaizen
    Astrophys. J. 838, 1 (2017); arXiv:1702.07361 [astro-ph.IM]

Proceedings

  1. "Pairwise Neutrino Flavor Conversion in Supernovae: Quantum Kinetics and Astrophysical Implications"
    Masamichi Zaizen
    Class. Quantum Grav. in press (2026); Contribution to SN2025gw
    Focus on Core Collapse Supernova Gravitational Wave Astronomy and Astrophysics: Past, Present, and Future; Proceedings
  2. "Collective flavor conversion including the neutrino halo in core-collapse supernovae"
    Masamichi Zaizen, John F. Cherry, Tomoya Takiwaki, Shunsaku Horiuchi, Kei Kotake, Hideyuki Umeda, and Takashi Yoshida
    J. Phys. Conf. Ser. 1468 (2020) 1, 012137;
    Contribution to TAUP 2019
    Proceedings: 16th International Conference on Topics in Astroparticle and Underground Physics (TAUP 2019) 9-13 September 2019, Toyama, Japan

Science Magazines

  1. "Quantum Kinetics of Neutrinos in High-Energy Astrophysical Events"
    Masamichi Zaizen
    Butsuri Vol.81 No.7 p.385-390 (2026); Index