Masaya Amo

Paper

Masaya Amo, Keisuke Izumi, Hirotaka Yoshino, Yoshimune Tomikawa, Tetsuya Shiromizu, "A generalization of photon sphere based on escape/capture cone," EPJ C 84 638 [arXiv:2305.11208] (2024).
Masaya Amo, Antonia M. Frassino, Robie A. Hennigar, "Entropy Bounds for Rotating AdS Black Holes," Phys. Rev. Lett. 131 241401, [arXiv:2307.03011] (2023).
Masaya Amo, Keisuke Izumi, Yoshimune Tomikawa, Tetsuya Shiromizu, Hirotaka Yoshino, "Asymptotic behavior of null geodesics near future null infinity IV: Null-access theorem for generic asymptotically flat spacetime," Phys. Rev. D 107 124050, [arXiv:2305.01767] (2023).
Masaya Amo, Keisuke Izumi, Yoshimune Tomikawa, Hirotaka Yoshino, Tetsuya Shiromizu, "Asymptotic behavior of null geodesics near future null infinity III: Photons towards inward directions," Phys. Rev. D 106 084007, [arXiv:2208.00822] (2022) [erratum: Phys. Rev. D 107, 084007 (2023)].
Masaya Amo, Tetsuya Shiromizu, Keisuke Izumi, Hirotaka Yoshino, Yoshimune Tomikawa, "Asymptotic behavior of null geodesics near future null infinity II: curvatures, photon surface and dynamically transversely trapping surface," Phys. Rev. D 105 064074, [arXiv:2110.10917] (2022).
Masaya Amo, Keisuke Izumi, Yoshimune Tomikawa, Hirotaka Yoshino, Tetsuya Shiromizu, "Asymptotic behavior of null geodesics near future null infinity: Significance of gravitational waves," Phys. Rev. D 104 064025, [arXiv:2106.03150] (2021) [erratum: Phys. Rev. D 107, 029901 (2023)].

Journal Article

Masaya Amo, Aiko Takafuji, and Naho Fujita, "The Mysterious Sounds of Auroras (オーロラの音の謎に迫る)" The astronomical herald (天文月報) 113 488–496, 2020.

Presentation (International)

"Violations of weak Cosmic Censorship Conjecture in AdS3," JOINT WORKSHOP ON GENERAL RELATIVITY AND COSMOLOGY 2025 (JGRC3), Mar. 2025, Saitama, Poster.
"Violations of weak Cosmic Censorship Conjecture in AdS3," Gravity 2025: New Horizon of Black Hole Physics, Jan. 2025, Kyoto, Oral.
"Violations of weak Cosmic Censorship Conjecture in AdS3," JGRG33, Dec. 2024, Osaka, Oral.
"Entropy-Bound Conjecture for Rotating AdSBlack Holes," COSMO'24, Oct. 2024, Kyoto, Oral.
"Violations of Weak Cosmic Censorship Conjecture in AdS," The 3rd young researchers' workshop of the Extreme Universe Collaboration, Sep. 2024, Otaru, Poster.
"Entropy Bounds for Rotating AdS Black Holes," The 2nd young researchers' workshop of the Extreme Universe Collaboration, Feb. 2024, Shiga, Oral.
"Entropy Bounds for Rotating AdS Black Holes," Gravity and Cosmology 2024, Feb. 2024, Kyoto, Oral.
"Entropy Bounds for Rotating AdS Black Holes," JGRG32, Dec. 2023, Nagoya, Oral.
"New Inequalities in Extended Black Hole Thermodynamics," Quantum Information, Quantum Matter and Quantum Gravity, Sep. 2023, Kyoto, Poster.
"New Inequalities in Extended Black Hole Thermodynamics," Gravity - New perspectives from strings and higher dimensions, 2023, Benasque, Poster.
"A generalization of photon sphere based on escape cone" 23rd Eastern Gravity Meeting, Jun. 2023, Rhode Island, Oral.
"Generalization of the photon sphere referring to null infinity" JGRG31, Oct. 2022, Tokyo, Oral.
"Asymptotic properties of null geodesics near null infinity" Asia-Pacific School and Workshop on Gravitation and Cosmology 2022, Mar. 2022, Online, Oral.
"Asymptotic behavior of null geodesics near future null infinity: Relationship to gravitational waves and curvature" JGRG30, Dec. 2021, Online, Oral.

Masaya Amo et al. "Investigation of the Spatial Cognition in Microgravity" The 3rd International Moon Village Workshop & Symposium, Dec. 2019, Kyoto, Poster.

Presentation (Japanese)

"Potential Violation of Weak Cosmic Censorship in AdS3," The Physical Society of Japan 2025 Spring Meeting, Mar. 2025, Online, Oral.
"拡張ブラックホール熱力学における新しい不等式予想の提唱," Rironkon Symposium, Dec. 2024, Tokyo, Oral.
"拡張ブラックホール熱力学における新しい不等式予想の提唱," The Physical Society of Japan 78th Annual Meeting, Sep. 2023, Sendai, Oral.
"光的無限遠への光の到達条件を基にした光子球の一般化," Workshop on General Relativity, Cosmology, and Black Hole Information Paradox, Sep. 2022, Nagoya, Oral.
"光的無限遠を参照した光子球の一般化," The Physical Society of Japan 2022 Autumn Meeting, Sep. 2022, Okayama, Oral.
"photon sphereの一般化「dark horizon」," 第52回天文・天体物理若手夏の学校, Aug. 2022, online, Oral.
"無限遠近傍における近似的photon surfaceの存在条件," The Physical Society of Japan 2022 Spring Meeting, Mar. 2022, online, Oral.
"Null infinityを参照したphoton sphereの一般化," 第22回「特異点と時空、および関連する物理」研究会, Dec. 2021, online, Oral.
"光的測地線の光的無限遠への到達条件," The Physical Society of Japan 2021 Autumn Meeting, Sep. 2021, online, Oral.
"4次元 Einstein-Gauss-Bonnet理論における静的球対称ブラックホールの周りの性質," 第50回天文・天体物理若手夏の学校, Aug. 2020, online, Oral.

"京都系外惑星観測入門," 第12回宇宙ユニットシンポジウム Feb. 2019, Kyoto, Poster.
"将来の有人宇宙ミッションに向けた京大教育プログラム," 第12回宇宙ユニットシンポジウム, Feb. 2019, Kyoto, Oral.
"微小重力空間における空間認知の検討," 12th Unit of Synergetic Studies for Space, Feb. 2019, Kyoto, Poster.

"オーロラの音のメカニズムに迫る," 11th Unit of Synergetic Studies for Space, Feb. 2018, Kyoto, Poster.

Invited Talk

"AdS3における弱い宇宙検閲官仮説の反例探査 (Violating Weak Cosmic Censorship in AdS_3 via Gedanken Experiment)" at 第5回素粒子論学生交流会, Keio University, Oct. 2024．
"定常AdSブラックホールの面積の上限予想 (Conjecture on upper bound of horizon area for stationary AdS black hole)" at 第8回ブラックホール研究会 (The 8th Black hole Seminar), Nihon University, Mar. 2024．
"定常AdSブラックホールの面積の上限予想(Conjecture on upper bound of horizon area for stationary AdS black hole)", Osaka Metropolitan University, Jan. 2024．
"null測地線の無限遠近傍の漸近的振る舞い" KMI主催分野横断セミナー, Dec. 2022．

"The Mysterious Sounds of Auroras (オーロラの音の謎に迫る)", Unit of Synergetic Studies for Space Seminar Dec. 2017.

Award & Fundings

Student Presentation Award of the Physical Society of Japan, Oct. 2023.
Overseas Challenge Program for Young Researchers, 1st Apr. -- 29th Jun., 1,400,000 yen.
The ANRI Fellowship, for 2023 fiscal year, 500,000 yen.
Presentation Award at The 31st Workshop on General Relativity and Gravitation in Japan (JGRG31), Oct. 2022.
Student Presentation Award of the Physical Society of Japan, Oct. 2022.
Oral Award at 52nd Summer School for students and young researchers on astronomy and astrophysics, Aug. 2022.
Grant-in-Aid for JSPS Fellows No. 22J20147, Apr. 2022 -- Mar. 2025 2,400,000 yen.
Oral Award at 50th Summer School for students and young researchers on astronomy and astrophysics, Aug. 2020.
The most outstanding project award at Spring School at Institute for Cosmic Ray Research of the University of Tokyo, Observational Cosmology Group, Mar. 2019.

11th Unit of Synergetic Studies for Space, Poster Presentation, Outstanding Award, Feb. 2018.
SPEC: Student Projects for Enhancing Creativity 2017, 500,000 yen, Oct. 2017.
The 3rd Omoro Challenge, 300,000 yen, Jun. 2017.