Special Lecture

Quantum Simulations of Entanglement in Jet Production and Structure Functions at the EIC

October 20 (Tue) 15:30 - 17:00, 2026

Dima Kharzeev (Professor, Department of Physics, University of Connecticut, USA)

The Electron–Ion Collider (EIC) offers an opportunity to explore the quantum structure of hadronic matter and the role of entanglement in high-energy scattering. I will present our results on quantum simulations of entanglement in jet production and structure functions, highlighting how quantum computing can help investigate correlations in partonic dynamics. I will discuss the physical insights emerging from these simulations and their implications for connecting quantum information concepts with observables at the EIC.

Venue: Seminar Room #359 (Main Venue) / via Zoom

Event Official Language: English

iTHEMS x academist Online Event "World of Mathematical Sciences 2026"

April 18 (Sat) 10:00 - 15:30, 2026

Junnosuke Koizumi (Special Postdoctoral Researcher, Division of Fundamental Mathematical Science, RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS))
Osamu Fukushima (Special Postdoctoral Researcher, Division of Fundamental Mathematical Science, RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS))
Muzi Hong (Postdoctoral Researcher, Division of Fundamental Mathematical Science, RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS))
Kenji Okubo (Special Postdoctoral Researcher, Division of Fundamental Mathematical Science, RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS))

Venue: via Zoom

Event Official Language: Japanese

iTHEMS x academist Online Event "World of Mathematical Sciences 2025"

April 19 (Sat) 10:00 - 15:30, 2025

Yuuka Kanakubo (Postdoctoral Researcher, RIKEN-Berkeley Center, Division of Global Collaborations and Research Talent Development, RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS))
Kan Kitamura (Special Postdoctoral Researcher, Division of Fundamental Mathematical Science, RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS))
Leo Speidel (RIKEN ECL Unit Leader, Mathematical Genomics RIKEN ECL Research Unit, Division of Fundamental Mathematical Science, RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS))
Yuki Yokokura (Senior Research Scientist, Division of Fundamental Mathematical Science, RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS))

Venue: via Zoom

Event Official Language: Japanese

RIKEN iTHEMS & AIPmath Special Lecture: Contact geometry in 3-dimensional space and higher

July 29 (Mon) 15:30 - 16:30, 2024

Emmy Murphy (Professor, Princeton University, USA)

In mathematics, contact geometry is a type of geometry describing a variety of dynamical systems. They are the phase spaces of systems arising in geometric optics, semi-classical quantum systems, classical dynamics, and control theory. On the mathematical side, contact geometry relates to a variety of other geometric structures, such as Kahler geometry, smooth topology, and foliation theory. It can be especially interesting to look at contact geometry in 3-dimensional space, because we can explicitly visualize the spaces. Additionally, by connecting contact geometry with our understanding of 3-D topology, mathematicians have the ability to understand the large-scale structure of these spaces like never before. The talk will introduce the basics of contact geometry and its applications. We'll particularly focus on the 3-dimensional case, while also mentioning some of the unique properties of higher-dimensional spaces which are recently being explored. Registration required: Register before Wednesday, July 24, 15:00.

Venue: RIKEN Tokyo Liaison Office (Nihonbashi) (Main Venue) / via Zoom

Event Official Language: English

iTHEMS x academist Online Event "World of Mathematical Sciences 2024"

April 21 (Sun) 10:00 - 15:30, 2024

Shingo Gibo (Postdoctoral Researcher, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS))
Taketo Sano (Special Postdoctoral Researcher, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS))
Misako Tatsuuma (Research Scientist, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS))
Tomoya Naito (Special Postdoctoral Researcher, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS))

Venue: via Zoom

Event Official Language: Japanese

TadaFest 2024: Toward understanding of the Origin of Spacetime

April 2 (Tue) 14:00 - 18:00, 2024

Tsukasa Tada (Deputy Program Director, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS))

Program 14:00-14:05 Welcome address T. Hatsuda (RIKEN iTHEMS) 14:05-15:35 T. Tada (RIKEN iTHEMS) "Toward understanding of the origin of spacetime" (This talk is in English) 15:35-16:00 coffee break 16:00-16:30 Shin Nakamura (Chuo Univ.) "Application of gauge/gravity duality: application to non-equilibrium physics" (This talk is in Japanese) 16:30-17:00 Kinya Oda (Tokyo Woman's Chiristian Univ.) "Gaussian formalism: From Hesenberg's Uncertainty Principle to Time-Boundary Effect and Lorentz-Covariant Complete Basis for Spinors" (This talk is in Japanese) 17:00-17:30 Gen Tatara (RIKEN, CEMS) "Some topics of spintronics" (This talk is in Japanese) 17:30-18:00 Asato Tsuchiya (Shizuoka Univ.) "Recent progress in the studies of the emergence of space-time in the type IIB matrix model" (This talk is in Japanese) 18:15- informal discussion @ Common space on 3F of the main research building

Venue: Okochi Hall (Main Venue) / via Zoom

Event Official Language: English

Kyoto University SACRA-RIKEN iTHEMS Special Lecture by Prof. Tadashi Tokieda

March 28 (Thu) 13:30 - 16:30, 2024

Tadashi Tokieda (Professor, Department of Mathematics, Stanford University, USA)

This event will be conducted in Japanese.

Venue: Large Conference Room, The Kyoto University Tokyo Office

Event Official Language: Japanese

iTHEMS x academist Online Event "World of Mathematical Sciences 2023"

April 22 (Sat) 10:00 - 16:30, 2023

Takumi Doi (Senior Research Scientist, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS))
Ryo Namba (Senior Research Scientist, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS))
Yuto Moriwaki (Special Postdoctoral Researcher, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS))
Kyosuke Adachi (Special Postdoctoral Researcher, Nonequilibrium Physics of Living Matter RIKEN Hakubi Research Team, RIKEN Center for Biosystems Dynamics Research (BDR))
Natsuki Tomida (Specially Appointed Assistant Professor, Center for Science Adventure and Collaborative Research Advancement (SACRA), Graduate School of Science, Kyoto University)

Venue: via Zoom

Event Official Language: Japanese

The Electron-Ion Collider: the Ultimate Electron Microscope

February 20 (Mon) 15:00 - 16:30, 2023

Gordon Baym (Professor Emeritus, University of Illinois, USA)

How does the nucleon get its mass? Certainly not from the Higgs -- the rest masses of the quarks it contains add up to only one percent of the nucleon mass. Rather the remaining 99% comes from the zero-point energy of the quarks, antiquarks and gluons localized in the nucleon. How do nuclei differ from being a simple collection of nucleons? How are the gluons, for example, distributed in nuclei? Do they stick out, or are they clumped towards the center of the nucleon? Gluons, like dark matter unseen but playing the crucial role in gluing matter together, are strongly interacting. Do such gluons form new emergent quantum states in nuclei, as in condensed matter physics? And how is the spin of the proton -- the key to NMR imaging -- put together from the spin and orbital motion of the quarks and gluons in the proton?

Venue: Okochi Hall (Main Venue) / via Zoom

Event Official Language: English

iTHEMS x academist Online Event "World of Mathematical Sciences 2022"

April 24 (Sun) 10:00 - 16:30, 2022

Masaki Taniguchi (Special Postdoctoral Researcher, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS))
Hidetoshi Taya (Special Postdoctoral Researcher, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS))
Akira Harada (Special Postdoctoral Researcher, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS))
Yingying Xu (Special Postdoctoral Researcher, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS))
Euki Yazaki (Postdoctoral Researcher, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS))

Venue: via Zoom

Event Official Language: Japanese

[Shigefumi Mori and Takashi Sakajo Special Talk] How is mathematics utilized in society? - Exploring the Essence of Mathematical Research

March 12 (Sat) 13:00 - 14:30, 2022

Tetsuo Hatsuda (Program Director, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS))
Takashi Sakajo (Professor, Division of Mathematics and Mathematical Sciences, Graduate School of Science, Kyoto University)
Shigefumi Mori (Director-General, Kyoto University Institute for Advanced Study (KUIAS))

Venue: via Zoom

Event Official Language: Japanese

Tetsuo Hatsuda x Kunihiko Nakata x Yoshihiro Kozuka x Kenshiro Sadaka‏ x Aiko Teranishi - Will Useless Knowledge Change the Future? - What is the Black Hole Recorder?

August 2 (Mon) 20:00 - 22:00, 2021

Tetsuo Hatsuda (Program Director, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS))
Kunihiko Nakata (NAKATA KUNIHIKO DESIGN)
Yoshihiro Kozuka (Creative Director, ADK Holdings Inc.)
Kenshiro Sadaka (ADK Holdings Inc.)
Aiko Teranishi (President and CEO, indigo.inc)

This event will feature a thorough explanation of the "Black Hole Recorder," a device inspired by the latest black hole theory. Free of charge. Registration required.

Venue: via Zoom

Event Official Language: Japanese

iTHEMS x academist online open to the public "World of Mathematical Sciences 2021"

April 18 (Sun) 10:00 - 16:30, 2021

Kanato Goto (Special Postdoctoral Researcher, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS))
Jeffrey Fawcett (Senior Research Scientist, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS))
Takuya Sugiura (Postdoctoral Researcher, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS))
Naomi Tsuji (Postdoctoral Researcher, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS))
Keita Mikami (Research Scientist, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS))
Tetsuo Hatsuda (Program Director, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS))

Venue: via Zoom

Event Official Language: Japanese

Tetsuo Hatsuda × Yoshinori Ohsumi × Sayaka Oki Online Discussion: "The Usefulness of 'Useless' Knowledge" Presented by iTHEMS & academist

August 22 (Sat) 13:00 - 15:30, 2020

Tetsuo Hatsuda (Program Director, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS))
Yoshinori Ohsumi (Cell Biology Center, Institute of Innovative Research, Tokyo Institute of Technology)
Sayaka Oki (Graduate School of Economics, Department of Socio-Economic System, Nagoya University)

学問の世界で大切なのは、研究者の「なぜ」「不思議だな」という好奇心です。研究者は自らの好奇心をもとに想像力を膨らませ、さまざまな仮説を立て、それを実験、観測、調査で検証し、最終的には理論的に体系づけていきます。このような基礎研究で得られた知識は、私たちの生活に直接「役に立つ」ものではありません。しかし、5年、10年といった期間ではなく、100年、1000年単位で考えると、基礎研究は確実に世の中の役に立ち、私たちはその恩恵にあずかっています。 現在、国内外の大学や研究機関には、企業の経営戦略からきている「選択と集中」の考えが入ってきており、好奇心に基づいた研究を進めることが難しくなっています。令和時代において、私たちはどのように基礎研究を継続させていくことができるのでしょうか。今回のイベントでは、各分野で活躍する3名の研究者にお越しいただき、登壇者の一人でもある初田哲男氏監訳の書籍タイトル『「役に立たない」科学が役に立つ』をテーマとした議論を進めていきます。 13:00-13:05　Opening 13:05-14:05　Topics 14:10-15:20　Panel Discussion 15:20-15:30　Summary Capacity: 1,000 people Participation fee: Free of charge Target audience: everyone is welcome to attend Organized by iTHEMS and Academist The URL for Zoom will be sent to you after you register for the event. For more details and registration, please click on the link from "Related Links".

Venue: via Zoom

Event Official Language: Japanese

iTHEMS x academist Online open to the public "World of Mathematical Sciences"

April 18 (Sat) 10:00 - 17:00, 2020

Yuki Yokokura (Senior Research Scientist, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS))
Ryosuke Iritani (Research Scientist, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS))
Hirotaka Irie (Visiting Scientist, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS) / Assistant Manager, DENSO Corporation)
Nagisa Hiroshima (Visiting Scientist, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS) / Assistant Professor, Department of Physics, Faculty of Science, University of Toyama)
Hiroyasu Miyazaki (Special Postdoctoral Researcher, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS))
Akinori Tanaka (Senior Research Scientist, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS))

Venue: via Zoom

Event Official Language: Japanese

How did the Universe Begin? -Inflation Theory & Road to the Proof-

May 21 (Tue) 15:00 - 16:30, 2019

Katsuhiko Sato (Professor Emeritus, The University of Tokyo / Director, Research Center for Science Systems, Japan Society for the Promotion of Science)

Venue: Okochi Hall

Broadcast:R511, Computational Science Research Building / SUURI-COOL (Kyoto) / SUURI-COOL (Sendai)

Event Official Language: Japanese

The physical and biological basis of tissue growth

December 12 (Wed) 15:00 - 16:30, 2018

Kaoru Sugimura (Program-Specific Research Center Associate Professor, Kyoto University)
Shuji Ishihara (Project Associate Professor, The University of Tokyo)

15:00 - 15:40 "Physical and molecular mechanism of cell rearrangement" Kaoru Sugimura 15:50 - 16:30 "From cells to tissue: A continuum model of epithelial tissue mechanics" Shuji Ishihara

Venue: Okochi Hall

Broadcast:R511, Computational Science Research Building / SUURI-COOL (Kyoto) / SUURI-COOL (Sendai)

Event Official Language: Japanese

Development and Evolution

December 1 (Fri) 15:00 - 17:30, 2017

Shigeru Kuratani (Chief Scientist, Evolutionary Morphology Laboratory)

Venue: Suzuki Umetaro Hall

Event Official Language: Japanese

The Dawn of the Gravitational Wave Astronomy and the Discovery of the Neutron Star Merger

October 31 (Tue) 15:30 - 17:00, 2017

Shigehiro Nagataki (Deputy Program Director, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS) / Chief Scientist, Astrophysical Big Bang Laboratory, RIKEN)
Susumu Inoue (Research Scientist, Astrophysical Big Bang Laboratory, RIKEN)
Toru Tamagawa (Chief Scientist, High Energy Astrophysics Laboratory, RIKEN)

Venue: Okochi Hall

Event Official Language: Japanese

"Nihon Shoki" Classification Theory

August 24 (Thu) 15:00 - 17:30, 2017

Hiromichi Mori (Professor, Kyoto Sangyo University)

Venue: Okochi Hall

Event Official Language: Japanese