Publications

Peer-reviewed Papers (First Author)

1. "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]
2. "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]
3. "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]
4. "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]
5. "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]
6. "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]
7. "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 (The time evolution of halo contribution)
8. "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]

Peer-reviewed Papers (Co-author)

1. "Quasi-steady evolution of fast neutrino-flavor conversions"
   Jiabao Liu, Hiroki Nagakura, Masamichi Zaizen, Lucas Johns, Ryuichiro Akaho, Shoichi Yamada
   Submitted to Phys. Rev. D; arXiv:2411.08503 [astro-ph.HE]
2. "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]
3. "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]
4. "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]
5. "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]
6. "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]
7. "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]
8. "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]
9. "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]
10. "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]
11. "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]
12. "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. "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; @ TAUP 2019