Otsuka Hajime

オオツカハジメ | Otsuka Hajime

Affiliation and department：

Research field (1)： Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics

Research keywords (2)：素粒子理論 , 素粒子現象論

Research theme for competitive and other funds (5)：

Papers (66)：

Takaaki Nomura, Hiroshi Okada, Hajime Otsuka. Texture zeros realization in a three-loop radiative neutrino mass model from modular A4 symmetry. Nuclear Physics B. 2024. 1004
Hajime Otsuka, Yutaka Sakamura. Induced moduli oscillation by radiation and space expansion in a higher-dimensional model. Physical Review D. 2024. 109. 11
Keiya Ishiguro, Takafumi Kai, Tatsuo Kobayashi, Hajime Otsuka. Flux Landscape with enhanced symmetry not on SL(2, Z) elliptic points. Journal of High Energy Physics. 2024. 2024. 2
Keiya Ishiguro, Takafumi Kai, Satsuki Nishimura, Hajime Otsuka, Maki Takeuchi. Upper bound on the Atiyah-Singer index from tadpole cancellation. Journal of High Energy Physics. 2024. 2024. 1
Tatsuo Kobayashi, Takaaki Nomura, Hiroshi Okada, Hajime Otsuka. Modular flavor models with positive modular weights: a new lepton model building. Journal of High Energy Physics. 2024. 2024. 1

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MISC (15)：

大塚啓, 下村崇, 下村崇, 津村浩二, 内田祥紀, 山津直樹. Pseudo-Nambu-Goldstone Dark Matter from Non-Abelian Gauge Symmetry. 日本物理学会講演概要集(CD-ROM). 2023. 78. 1
石黒奎弥, 小林達夫, 大塚啓. Landscape of Modular Symmetric Flavor Models. 日本物理学会講演概要集(CD-ROM). 2021. 76. 1
大塚啓. 時空概念と物理学の発展超弦時空と機械学習. 数理科学. 2020. 59. 1
竹本賢太, 大塚啓. Classification of SO(32) heterotic string vacua by autoencoder and clustering. 日本物理学会講演概要集(CD-ROM). 2020. 75. 1
石黒奎弥, 大塚啓. IIB型超弦理論におけるブロー・アップモジュライの固定. 日本物理学会講演概要集(CD-ROM). 2020. 75. 1

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Lectures and oral presentations (75)：

Stringy constraints on primordial electromagnetic fields in axion inflation
(Seminar at Osaka University 2024)
Top-down modular invariance approach to flavour II
(Modular Invariance Approach to the Lepton and Quark Flavour Problems: from Bottom-up to Top-down 2024)
Modular Flavor Symmetry in Heterotic $E_6$ GUT
(Workshop on Grand Unified Theory, Phenomenology and Cosmology (GUTPC) 2024)
Sequestered String Models imply Split Supersymmetry
(2024)
Modular forms and hierarchical Yukawa couplings in heterotic Calabi-Yau compactifications
("Particle Physics and Cosmology from String Compactification" 2nd meeting 2024)

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Education (3)：

2013 - 2016 Waseda University Graduate School of Advanced Science and Engineering
2011 - 2013 Waseda University Graduate School of Advanced Science and Engineering
2007 - 2011 Waseda University School of Advanced Science and Engineering

Work history (4)：

2022 - 現在 Kyushu University Faculty of Sciences Department of Physics Assistant Professor
2021 - 2021 Institute for Basic Science Senior Researcher
2019 - 2021 High Energy Accelerator Research Organization Institute of Particle and Nuclear Studies
2016 - 2019 Waseda University Faculty of Science and Engineering Assistant Professor

Association Membership(s) (1)：

日本物理学会

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