九州大学量子宇宙物理理論研究室

Theoretical Quantum Physics, Gravitation and Cosmology,

Kyushu University

Photos by Sugumi Kanno @ Einstein Museum

Our research group explores cosmology and gravitational theory using quantum information theory. We are theoretically investigating fundamental questions such as “How did the universe begin and evolve?” and “Is it possible to unify gravity and quantum theory?”

In cosmology, we focus on primordial gravitational waves generated in the early universe and the nature of dark matter. In gravitational theory, we address foundational problems concerning the consistency between gravity and quantum field theory. (Click here for more details on our research.)

Our group consists of 4 faculty members, 2 doctoral students, 5 master's students, and 4 undergraduate students. (Click here for more details about members.)

Nov 12, 2025

Our paper appears on arXiv.

Yuka Shiomatsu, Youka Kaku, Akira Matsumura, Tomohiro Fujita

"Boosting Gravity-Induced Entanglement through Parametric Resonance''

arXiv:2511.09169 [gr-qc]

Oct 27, 2025

Our paper appears on arXiv.

Sugumi Kanno, Jiro Soda, Akira Taniguchi

"Binary gravitational waves as probes of quantum graviton states''

arXiv:2508.23326 [gr-qc]

Oct 20, 2025

Tomoya Hirotani received the Student Presentation Award of the Physical Society of Japan at the Physical Society of Japan 2025 Annual Meeting.

発表題目：Oppenheimによる相対論的半古典重力模型で予言される測地線偏差の量子ゆらぎ

The image is from HP of the COSMO-25

Oct 13 - 17, 2025

Akira Taniguchi gave an oral presentation at 28th International Conference on Particle Physics & Cosmology (COSMO-25) held at Carnegie Mellon University, Pittsburgh.

The image is from HP of the Elementary, particles, space, gravity and quantum sensing.

Oct 8 - 10, 2025

In the Elementary, particles, space, gravity and quantum sensing, Akira Matsumura talked as an invited speaker and Akira Taniguchi, Kosei Hatakeyama, Ryotaro Fukuzumi and Taiki Ikeda made oral presentations.

Oct 1, 2025

"Quantum and Spacetime Research Institute" has been founded.

Press Release: https://www.kyushu-u.ac.jp/ja/notices/view/2965

The image is from HP of Research and education at Hiroshima University's Institute of Theoretical Science.

Sep 24, 2025

Kazuhiro Yamamoto talked in the Research and education at Hiroshima University's Institute of Theoretical Science as an invited speaker.

The photo is from HP of The Physical Society of Japan 2025 Annual Meeting

Sep 16 - 19, 2025

Takano Taira, Akira Taniguchi, Yuta Uenaga, Kosei Hatakeyama, Tomoya Hirotani and Ryotaro Fukuzumi talked in The Physical Society of Japan 2025 Annual Meeting.