Research field (1)：
Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics
Research theme for competitive and other funds (9)：
2021 - 2025 Axion dark matter search with the world's largest radio telescope SKA
2021 - 2025 強磁場高密度天体で探るアクシオン暗黒物質
2020 - 2025 A theoretical study of the generation and evolution of light dark matter
2020 - 2025 極弱相互作用を持つ軽い新粒子の描く新宇宙描像とその実験的検証
2019 - 2023 Deciphering string axiverse from multi-wavelength observations of gravitational waves
2019 - 2022 Theoretical study towards the indirect detection of the axion dark matter by the observation of neutron star
2018 - 2021 Search for dark matter axions using superconducting junctions
2017 - 2020 アクシオンと初期宇宙シナリオに関する研究
2012 - 2013 超対称性アクシオン模型の宇宙論
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Papers (48)：
Kentaro Kasai, Masahiro Kawasaki, Naoya Kitajima, Kai Murai, Shunsuke Neda, Fuminobu Takahashi. Primordial origin of supermassive black holes from axion bubbles. Journal of Cosmology and Astroparticle Physics. 2024. 2024. 05. 092-092
Naoya Kitajima, Junseok Lee, Kai Murai, Fuminobu Takahashi, Wen Yin. Gravitational waves from domain wall collapse, and application to nanohertz signals with QCD-coupled axions. Physics Letters B. 2024. 851. 138586-138586
Naoya Kitajima, Kazunori Nakayama. Nanohertz gravitational waves from cosmic strings and dark photon dark matter. Physics Letters B. 2023. 846. 138213-138213
Kentaro Kasai, Masahiro Kawasaki, Naoya Kitajima, Kai Murai, Shunsuke Neda, Fuminobu Takahashi. Clustering of primordial black holes from QCD axion bubbles. Journal of Cosmology and Astroparticle Physics. 2023. 2023. 10. 049-049
Naoya Kitajima, Tomo Takahashi. Stochastic gravitational wave background from early dark energy. Journal of Cosmology and Astroparticle Physics. 2023. 2023. 10. 074-074
Cosmic string network and gravitational waves
(New Perspectives on Cosmology 2024 2024)
原始ブラックホールによる非ガウス性密度揺らぎ
(第12回 観測的宇宙論ワークショップ 2023)
Gravitational waves from early dark energy
(The 32nd Workshop on General Relativity and Gravitation in Japan 2023)
Nanohertz gravitational waves from axion domain walls coupled to QCD
(KiPAS international workshop "From particle physics to supernovae and early Universe" 2023)
中性子星磁場を用いたアクシオン探索
(Aso workshop on Particle Physics and Cosmology 2023 2023)
