Welcome to Norihiro Iizuka's homepage!
2026.3.10
Please see 「Recent topics/最近の話題」 for recent news.
Open to inquiries/
歡迎洽詢
🔸 Students / Prospective Students | 學生申請資訊 | 学生受け入れについて
Please see the section below titled 「Former PhD Students」 for more information.
更多資訊請參閱下方的「Former PhD Students」部分。
2025.6.24
Postdoc information updated.
2024.9.19
My website has moved to NTHU.
2023.4.2
See 「Recent topics/最近の話題」 for recent updates. 最近の話題や更新はそちらをご覧ください。
2022.4.1
My new homepage was presented to the public/ホームページを公開しました。
About me
飯塚則裕
Message
メッセージ
Welcome to my homepage
I am Nori Iizuka, a theoretical physicist at National Tsing Hua University, Taiwan, and at Yukawa Institute, Kyoto University, Japan. My research is in theoretical and mathematical physics, with a particular focus on string theory.
Very roughly speaking, string theory is an attempt to describe elementary particles not as point-like objects but as excitations of one-dimensional strings. Although it remains a theoretical framework rather than an experimentally established theory, it has provided deep ideas about quantum gravity, black holes, gauge theory, extra dimensions, and holography.
Among these topics, I am particularly interested in the gravitational side of string theory, especially quantum gravity, black holes, and the structure of spacetime. My past work has included studies of black-hole attractor mechanisms, holography, and quantum aspects of black holes and evaporation. In my research, questions of quantum gravity are approached mainly through string theory and holography, often in close connection with quantum information.
This website contains information about my research, publications, lectures, and teaching. I also hope it will be useful to students at different levels, from advanced high-school and undergraduate students to graduate students and researchers who are interested in string theory, quantum gravity, and related areas.
I will also post information on talks, workshops, and recent research topics from time to time. I hope this website will be useful to students, collaborators, and anyone interested in these subjects.
こんにちは。私の新しいホームページへようこそ
私は理論物理学者で、国立清華大学および京都大学基礎物理学研究所に所属し、理論物理・数理物理、特に弦理論、量子重力、ブラックホール、ホログラフィーに関する研究を行っています。
弦理論って何?と思う人も多いと思います。ものすごく簡単に言えば、弦理論というのはこの世を構成する「素粒子」が、大きさのない点ではなく、弦楽器の弦のようにある長さをもった「ひも/弦」だと考える理論です。もちろん、この素粒子が「ひも/弦」のような構造でできているという実験的証拠は、現在まで確認されていません。したがって、素粒子が「ひも/弦」であるというのは、現時点では理論的仮説です。また、もし本当にそのような構造をもつとしても、その大きさは現代の実験では見えないほど小さいと考えなければなりません。
では、なぜそのような実験的に未確認の理論に興味をもつのか、と思うかもしれません。この枠組みを量子力学や相対論と整合的に考えていくと、弦理論は単に「ひも」の振動を扱う理論にとどまらず、重力、ブラックホール、余剰次元、ゲージ理論、ホログラフィーなど、現代理論物理のさまざまな重要問題と深く関わることが分かってきます。また弦理論は、私たちの世界が3次元空間だけではなく、非常に小さく折りたたまれた他の空間方向をもつ可能性も示唆します。このように弦理論は、まだ私たちの知らない豊かな数学的・物理的構造を含む理論なのです。
そのような豊かな構造をもつ弦理論の中でも、特に私が関心をもっているのは、量子重力理論としての弦理論の側面です。私の研究では、量子重力の問題を主に弦理論とホログラフィーを通して考えており、しばしば量子情報との関係にも注目しています。
このホームページでは、弦理論、量子重力、ブラックホール、ホログラフィーといった私の研究分野について、高校生、大学生、大学院生、研究者など、それぞれの段階に応じて紹介していきたいと思っています。
あわせて、研究会、講演、最近の研究動向などの情報も掲載していく予定です。弦理論や量子重力に関心のある方にとって、少しでも役に立つホームページになれば幸いです。
国立清華大学
物理学専攻 副教授
飯塚 則裕
Associate Professor,
National Tsing Hua University
NORIHIRO IIZUKA
Career
I was born in Osaka. In 1994, I entered the University of Tokyo, and in 1998 I graduated from the
Department of Applied Physics. After further study at the University of Tokyo, I moved to the United States in 1999 to begin my Ph.D. studies at
Columbia University.
At Columbia, under the supervision of Daniel Kabat, I worked on string theory, black holes, and holography.
In 2003, I received my Ph.D. from Columbia University.
The title of my thesis was
"Holographic description of quantum black holes and spacetime."
I then began my postdoctoral career at
the Tata Institute for Fundamental Research (TIFR) in India,
where I had the opportunity to work with Sandip Trivedi, Atish Dabholkar, and others.
My time at TIFR had a strong influence on my early development as a researcher.
In 2006, I moved to
the Kavli Institute for Theoretical Physics (KITP)
in Santa Barbara, California, for my second postdoctoral position.
It was during this period that I worked with Joseph Polchinski on holography and quantum aspects of black holes.
In 2009, I joined
CERN
as a Non-member-state fellow and COFUND fellow.
In 2012, I moved to the Yukawa Institute for Theoretical Physics, and in 2013 to RIKEN.
From 2014 to 2024, I was based at Osaka University.
Since 2024, I have been serving as an Associate Professor at
National Tsing Hua University in Taiwan,
while continuing research in collaboration with
the Yukawa Institute for Theoretical Physics, Kyoto University.
Over the course of my career, I have spent more than thirteen years abroad, including time in the United States, India, and Europe.
These experiences in international research environments have strongly shaped my style of research and collaboration.
At Osaka University, I supervised several graduate students.
Kotaro Tamaoka is now an Associate Professor at Nihon University, and Takanori Anegawa is now an Assistant Professor at Yonago National College of Technology.
I have also worked with postdoctoral researchers and collaborators from abroad, including Sunil Kumar Sake, Nicolo Zenoni, and Akihiro Miyata.
I am now based mainly in Taiwan, where I continue research on quantum gravity, black holes, holography, and quantum information.
My recent interests include multipartite entanglement and its geometric meaning, black-hole information and evaporation, and related problems in quantum gravity.
These remain some of the central questions that motivate my research.
If you are interested in these topics, please feel free to contact me.
経歴
NORIHIRO IIZUKA 自己紹介
Self-introduction

過去に招待講義・招待講演で訪れた世界各地の大学、研究所

Postdocs/Students
ポスドク・学生
Postdoctoral Researchers / ポスドク研究員 / 博士後研究員
Dr. Shraiyance Jain
At National Tsing Hua University since November 2025 (visitor; postdoc from 2026), coming from the Tata Institute of Fundamental Research (TIFR) for his first postdoctoral position.
Dr. Akihiro Miyata/宮田 晃宏
At the Yukawa Institute for Theoretical Physics, Kyoto University, since January 2025.
Dr. Nicolo Zenoni
At Osaka University since January 2023, and at the Yukawa Institute for Theoretical Physics, Kyoto University since August 2024 (following my institutional move). From November 2025, he took up his second postdoctoral position as a JSPS Postdoctoral Fellow at the Yukawa Institute for Theoretical Physics, Kyoto University. From the fall of 2026, he will be a Humboldt Research Fellow at Wuerzburg University, Germany.
Dr. Sunil Kumar Sake
At Osaka University since November 2022, and at the Yukawa Institute for Theoretical Physics, Kyoto University since August 2024 (following my institutional move). From November 2025, he took up his second postdoctoral position at the University of California, Santa Cruz.
Dr. Takanori Anegawa / 姉川 尊徳
Current position (as of 2025): Assistant Professor, Yonago National College of Technology / 現職(2025年時点):米子工業高等専門学校 助教 / 目前職位(截至2025年):米子工業高等専門學校助理教授。
2024/03 PhD / 博士号:Thesis title / 論文題目「Research on hyperfast growth in de Sitter complexity」
2021/04–2024/03 JSPS Research Fellowship for Young Scientists (DC1) / 日本学術振興会特別研究員(DC1)
2021/03 MA / 修士号:Thesis title / 論文題目「Information paradox and island prescription」
2019/03 BA / 卒業研究:Thesis title / 卒論題目「Black Hole and Information Paradox」
Dr. Kotaro Tamaoka / 玉岡 幸太郎
Current position (as of 2025): Associate Professor, Nihon University / 現職(2025年時点):日本大学 准教授 / 目前職位(截至2025年):日本大學副教授。
2019/03 PhD / 博士号:Thesis title / 論文題目「Emergence of Bulk Geometries from Conformal Field Theory」
2016/03 MA / 修士号:Thesis title / 論文題目「Black Hole Entropy and three dimensional gravity / 3次元重力理論とブラックホールエントロピー」
Dr. Tsuyoshi Yokoya / 横矢 毅
2019/03 PhD / 博士号:Thesis title / 論文題目「Analysis on entanglement entropy for two-dimensional lattice gauge theories with matter fields」
2016/03 MA / 修士号:Thesis title / 論文題目「Breaking of supersymmetry through Witten index / Witten indexによる超対称性の破れの評価」
Former students and postdoctoral researchers from my group have gone on to a variety of academic positions in Japan and abroad.
I welcome inquiries from NTHU students who are interested in theoretical physics.
Possible topics of interest include quantum gravity, black holes, holography, entanglement, and mathematical physics.
I am particularly happy to hear from students who are interested in fundamental questions in spacetime, quantum gravity, and quantum information. In some approaches to quantum gravity, spacetime may not be fundamental but may instead emerge from more basic quantum structures, possibly related to entanglement. Examples of questions I am interested in include the emergence of spacetime, the quantum physics of black holes, and the role of quantum information in gravity.
If your interests are close to these topics, please feel free to contact me. Please write in English or Japanese. I am happy to respond in either language. At present, I can mainly respond to students who are enrolled at National Tsing Hua University (NTHU) or planning to enroll in the near future.🔸 Students / Prospective Students | 學生申請資訊 | 学生受け入れについて
Funding / Grants
獲得資金・フェローシップ等
Principal Investigator / 代表
1. NSTC of Taiwan, Grant No. 114-2112-M-007-025-MY3
專題研究計畫(一般研究計畫) / 課題名:黑洞與量子糾纏 / Black Holes and Quantum Entanglement
● 2025/02/01 – 2027/07/31
2. MEXT KAKENHI, Grant-in-Aid for Transformative Research Areas (A), No. 21H05184
学術変革領域研究(A)研究計画班 代表 / Transformative Research Areas (A), Project Leader
課題名:量子情報を用いた量子ブラックホールの内部の物理学の解明
● 2021 – 2026/03/31
学術変革領域研究(A)
極限宇宙の物理法則を創る ― 量子情報で拓く時空と物質の新しいパラダイム
MEXT KAKENHI: The Natural Laws of Extreme Universe – A New Paradigm for Spacetime and Matter from Quantum Information
Project website

3. Grant-in-Aid for Scientific Research (C) / 科研費 基盤C(代表)
No. 18K03619
課題名:ゲージ重力対応による、創発する時空とブラックホールの構造解明研究
● 2018 – 2021
4. Grant-in-Aid for Young Scientists (B) / 科研費 若手B(代表)
課題名:Solving Condensed Matter, Nuclear and Gravity Problems via String and Gauge/Gravity Duality
/ゲージ重力対応を核とした、物性、原子核、重力理論の未解決問題への挑戦
● 2013 – 2017
5. CERN Non-member State Fellowship and COFUND Fellowship
● 2009 – 2012
Co-Investigator / 分担
1. 科研費 基盤C(分担)
課題名:微分展開方を用いた新しいブラックホール解への解析的アプローチ
● 2017 – 2019
2. 科研費 基盤C(分担)
課題名:非線形物理現象へのAdS/CFT双対性の応用
● 2014 – 2016
Service / 学術コミュニティへの貢献
1. 日本学術振興会 特別研究員等審査会審査委員
● 任期終了:2025/06/30
2. sg-l 海外オブザーバー担当係
● 2015, 2016
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