Outline of Project C01

Quantum Cosmology from Quantum Information (21H05187)

Principal Investigator: Tadashi Takayanagi

The geometric formula of entanglement entropy (Ryu-Takayanagi formula), which connects quantum information and gravity theory, has led to the prediction that the universe in gravitational theory is a collection of quantum information, which has attracted worldwide attention. The aim of group C01 is to develop this prediction by introducing the viewpoint of quantum information into high energy theory, and to uncover the basic theory of the "dynamics of the creation of the universe (quantum universe)," which is one of the three problems of extreme universe. The foundation for this is the "gauge-gravity correspondence," or the hypothesis that the gravitational theory of the anti de Sitter universe is equivalent to a theory of quantum many-body system. The gauge-gravity correspondence is a powerful idea that has passed enormous verifications, but the basic principle of why this correspondence arises still remains unknown. If this principle is understood completely, it will be possible to elucidate the mechanism of the creation of the universe from nothing and eventually to construct the ultimate physical laws. The anti-de Sitter universe is a universe with negative curvature, while the real universe we live in and the process of creation of the universe are thought to have positive curvature, i.e., a de Sitter universe. In this research, we will first clarify the basic principle of gauge-gravity correspondence by combining the methods of quantum information theory and gauge-gravity correspondence, and then use it as a hint to extend the gauge-gravity correspondence beyond the anti-de Sitter universe to more general universes including the de Sitter universe. This will finally provide us with the fundamental theory for quantum cosmology.

Members in C01

[Principal Investigator]
Tadashi Takayanagi Yukawa Institute for Theoretical Physics, Kyoto University

[Co-Investigator]
Yasuaki Hikida Yukawa Institute for Theoretical Physics, Kyoto University
Kazumi Okuyama Faculty of Science, Shinshu University
Yasuhiro Sekino Faculty of Engineering, Takushoku University
Shigeki Sugimoto Department of Physics, Kyoto University

[International Research Collaborators]
Shinsei Ryu Princeton U., USA
Beni Yoshida Perimeter Institute, Canada

[ExU Postdoctoral Fellows(Research Collaborators)]
Jonathan Harper Yukawa Institute for Theoretical Physics, Kyoto University

[Research Collaborators]
Kanato Goto Yukawa Institute for Theoretical Physics, Kyoto University
Tomotaka Kitamura Institute of Theoretical Physics, Rikkyo University
Shoichiro Miyashita Graduate School of Advanced Science and Engineering, Waseda University
Kazuhiro Sakai Institute of Physics, Meiji Gakuin University
Takahiro Uetoko National Institute of Technology, Kushiro College
Masamichi Miyaji Institute for Advanced Research, Nagoya University
Kenta Suzuki Institute of Theoretical Physics, Rikkyo University
Ali Mollabashi Yukawa Institute for Theoretical Physics, Kyoto University
Pawel Caputa Warsaw University

[Post-doc Fellows]
Shan-Ming Ruan Yukawa Institute for Theoretical Physics, Kyoto University

[Graduate Students]
Zixia Wei Yukawa Institute for Theoretical Physics, Kyoto University
Yusuke Taki Yukawa Institute for Theoretical Physics, Kyoto University
Taishi Kawamoto Yukawa Institute for Theoretical Physics, Kyoto University
Naoki Ogawa Yukawa Institute for Theoretical Physics, Kyoto University
Yu-ki Suzuki Yukawa Institute for Theoretical Physics, Kyoto University
Takashi Tsuda Yukawa Institute for Theoretical Physics, Kyoto University
Kazuki Doi Yukawa Institute for Theoretical Physics, Kyoto University
Hiroki Kanda Yukawa Institute for Theoretical Physics, Kyoto University
Masahide Sato Yukawa Institute for Theoretical Physics, Kyoto University

[Past Members]
Ibrahim Akal Yukawa Institute for Theoretical Physics, Kyoto University
Yoshiki Sato Yukawa Institute for Theoretical Physics, Kyoto University