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XIIIth International Symposium on Nuclear Symmetry Energy (NuSym25)

September 8 (Mon) - 13 (Sat) 2025

[Scientific scope] The symposium will address experimental and theoretical investigations of the equation-of-state (EoS) of nuclear matter at various isospin asymmetries. Such investigations include efforts in nuclear structure, nuclear reactions and heavy-ion collisions, as well as in astrophysical observations of compact stars and associated phenomena. An important role of the symposium is to unify efforts of the nuclear physics and astrophysics communities in addressing common research challenges.

Venue: Integrated Innovation Building (IIB)

Event Official Language: English

The Theory of Periodic Tangles & Their Interdisciplinary Applications

July 28 (Mon) - August 1 (Fri) 2025

The mathematical characterization of entanglement holds immense potential for describing the mechanical functions of diverse physical systems and materials. A universal interdisciplinary study, involving scientists, engineers, and artists promises both advance of the field itself and significant contribution to the research and design of innovative solutions for textiles, medical devices, polymers, molecular chemistry, or construction materials among others. The program seeks an alternative to the trial–and–error approach, bringing together academia and industry to seek new sustainable solutions and inspiration, contributing to society. It will consist not only of scientific exchanges but will promote cultural impact by organizing exhibitions or hands–on workshops. Additionally, it will encourage several discussions by providing networking opportunities and utilizing the unique venue of House of Creativity at Tohoku University. This workshop will gather researchers from various disciplines and include invited lectures, a poster session, roundtable discussions, and brainstorming activities. Our focus will be on exploring the connections between knot theory and its applications in areas such as polymers and soft matter, textile mechanics, graphic design, and more. This event includes a joint symposium between the WPI–AIMR (Tohoku University) and WPI–SKCM2 (Hiroshima University) on Friday, August 1st, 2025: INTERWOVEN: A WPI–AIMR & WPI–SKCM2 Symposium, Towards a Universal Topological Model of Entangled Structures for Sustainable Metamaterials Please fill in the registration form by June 16th 2025. Confirmed speakers (alphabetical order): Jörn Dunkel (Massachusetts Institute of Technology) Yuanyuan Guo (Tohoku University) Tatsuki Hayama (Keio University) Louis H. Kauffman (University of Illinois at Chicago) Yuka Kotorii (Hiroshima University) Sofia Lambropoulou (National Technical University of Athens) Eleni Panagiotou (Arizona State University) Pedro M. Reis (École Polytechnique Fédérale de Lausanne) Takahiro Sakaue (Aoyama Gakuin University) Vanessa Sanchez (Rice University) Henry Segerman (Oklahoma State University) Koya Shimokawa (Ochanomizu University) Hiroshi Suito (Tohoku University) Ryuichi Tarumi (Osaka University) Hirofumi Wada (Ritsumeikan University) Please refer to the workshop website via the relevant link for more details. We are looking forward to your participation and to welcoming you to Sendai!

Venue: TOKYO ELECTRON House of Creativity, Katahira Campus, Tohoku University

Event Official Language: English

What is “Quantum”!?: RIKEN Symposium Commemorating 100 Years of Quantum Science

July 12 (Sat) 13:00 - 17:00, 2025

Makoto Kobayashi (Director Emeritus, Kobayashi-Maskawa Institute for the Origin of Particles and the Universe (KMI), Nagoya University)
Yasunori Nomura (Professor/Director, Berkeley Center for Theoretical Physics, University of California, Berkeley, USA)
Kenji Ito (Professor, Division of Contemporary Culture, Graduate School of Letters, Kyoto University)
Miho Hatanaka (Professor, Department of Chemistry, Faculty of Science and Technology, Keio University)
Norio Kawakami (Deputy Director, Fundamental Quantum Science Program, TRIP Headquarters, RIKEN)
Yasushi Okada (Deputy Director, RIKEN Center for Biosystems Dynamics Research (BDR))
Kouichi Hagino (Professor, Graduate School of Science, Kyoto University)
Shigeki Takeuchi (Professor, Graduate School of Engineering, Kyoto University)
Yasunobu Nakamura (Director, RIKEN Center for Quantum Computing (RQC))
Makoto Gonokami (President, RIKEN)

In celebration of the 100th anniversary of the birth of quantum science, the United Nations General Assembly has declared 2025 as the International Year of Quantum Science and Technology, coordinated by UNESCO. To mark this occasion, we will host a public symposium entitled: “What is “Quantum”!?: RIKEN Symposium Commemorating 100 Years of Quantum Science”, aimed at the general public. The talks will be conducted in Japanese. For more details and to register, please visit the official website via the related link.

Venue: via Zoom

Event Official Language: Japanese

RIKEN Theory Symposium

July 9 (Wed) - 10 (Thu) 2025

This symposium will bring together leading theorists from the fields of artificial intelligence, quantum information, quantum field theory, quantum gravity, and related areas of mathematics. It aims to stimulate interactions and collaborations across these diverse fields by fostering cross-disciplinary dialogue. It is organized by RIKEN's Pioneering Research Institute (PRI) together with the Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS), and the Center for Advanced Intelligence Project (AIP). July, 9th (Wed.) 9:20- 9:30 Opening Remarks Dr. Hirosi Ooguri 9:30 - 10:15　Daniel Jafferis, “Tensor models for 3d gravity” 10:45 - 11:30 Sameer Murthy, “Supersymmetric index of black holes and black strings” Transportation by bus from Wako-campus is available for up to 60 people. Special AIP-PRI-iTHEMS joint seminar Venue: Tokyo Open Space (RIKEN Nihonbashi Campus) 14:30 - 15:15 Sergei Gukov, “Math + AI = AGI” 15:15 - 16:00 Masazumi Honda, “Fracton topological phases and Foliated field theories” 16:30 - 17:15 Richard Kueng, “Learning to predict ground state properties of gapped Hamiltonians” *Due to building access restrictions, this session is open only to participants of the morning session, RIKEN affiliates, or those who have completed the registration form. If you wish to attend, please register via the Related Links section below. July, 10th (Thur.) 9:30 - 10:15 Yifan Wang, “Pinning Defects, Fusion and Factorization” 10:45 - 11:30 Yichul Choi, “Non-Invertible Symmetry and Entanglement Entropy” 11:45 - 12:30 Yuya Kusuki, “Non-invertible Symmetries on Non-orientable Surfaces” 14:00 - 14:45 Heeyeon Kim, “3d TFTs from 4d N=2 BPS particles” 15:15 -16:00 Yuto Moriwaki, “On mathematical formulations of conformal field theory” 16:00 - 16:45 Kantaro Ohmori, “Higher Representation Theory and Excitations of Gauge Theories” 16:45 -16:55 Closing Remarks by Dr. Motoko Kotani Organizer: RIKEN Pioneering Research Institute (PRI) Co-organizers: RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS) RIKEN Center for Advanced Intelligence Project (AIP)

Venue: Suzuki Umetaro Hall / Tokyo Open Space (COREDO Nihonbashi)

Event Official Language: English

MACS 10th Anniversary Colloquium & 2024 MACS Achievement Report Meeting

February 19 (Wed) 14:45 - 18:30, 2025

Hiroshi Kokubu (Executive Vice-President, Kyoto University)
Yoshiko Takahashi (Professor, Division of Biological Sciences, Graduate School of Science, Kyoto University)

14:45-15:00 Teatime discussion [15:00-16:30 First part: MACS 10th Anniversary Colloquium] 15:05-15:05 Opening 15:05-15:30 Talk by Prof. Hiroshi KOKUBU Title: How did MACS begin? Abstract: As the MACS program, which began with a kick-off symposium in May 2016, enters its 10th year in the academic year 2025, I would like to look it back and talk about how it started, what thoughts shared by people involved at the time led to the spirit of MACS. I’d also like to share ideas and experiences in the history of MACS over the past 10 years, including what we wanted to do with MACS in the beginning but could not, or how MACS have collaborated with other subsequent activities of Kyodai RIGAKU (Kyoto U Science). 15:30-15:55 Talk by Prof. Yoshiko TAKAHASHI Title: Excitement through the MACS program Abstract: When the MACS program was launched, a research article was published by Harvard University, in which the gut looping during vertebrate development was beautifully explained by inter-disciplined science with experimental biology, physics, and mathematics. I was very impressed and motivated by this paper, and aimed at similar new waves through the MACS program. I have been running a study group, in which graduate- and undergrad students of not only life science but also physics and mathematics joined, and we enjoyed discussion and looking at real chicken embryos. Such experiences are not what we can easily obtain in conventional education program in campus life. 15:55-16:20 Discussion 16:20-16:30 Break [16:30-18:30 Second part: 2024 MACS Achievement Report Meeting] 16:30-17:30 Flash Talks to report results 17:30-18:30 Poster Session by SG participating students

Venue: Science Seminar House (Map 9), Kyoto University

Event Official Language: Japanese

Can social issues be solved by mathematical science!? - Between Mathematics and Entrepreneurship

February 1 (Sat) 13:00 - 17:00, 2025

We will be holding the 4th symposium exploring the potential of mathematical science research to address societal challenges. Over the past three years, we have focused on themes such as "Social Implementation of Mathematical Research—Challenges and Overcoming Them," "Connecting Corporate Issues with Mathematical Research," and "Mathematical Research in Companies." In recent years, there has been a global surge in support for startups leveraging cutting-edge scientific and technological innovations. However, there are relatively few cases where mathematical foundation technologies have led to the creation of startups. On the other hand, IT giants of the 21st century, such as Google, have built their success on mathematical technologies, demonstrating the high potential of mathematics as a core technology for startups. This year, we will hear from various organizations that support university-based startups, as well as researchers who have successfully launched their own ventures. Together with the participants, we aim to learn about the intersection of "mathematical foundation technologies" and "startups" and discuss strategies to bridge the gap between the two.

Venue: Hybrid Format (Noyori Conference Hall, Nagoya University and Zoom)

Event Official Language: Japanese

Second Workshop on Fundamentals in Density Functional Theory (DFT2024)

February 20 (Tue) - 22 (Thu) 2024

The density functional theory (DFT) is one of the powerful methods to solve quantum many-body problems, which, in principle, gives the exact energy and density of the ground state. The accuracy of DFT is, in practice, determined by the accuracy of an energy density functional (EDF) since the exact EDF is still unknown. Currently, DFT has been used in many communities, including nuclear physics, quantum chemistry, and condensed matter physics, while the fundamental study of DFT, such as the first principle derivations of an accurate EDF and methods to calculate many observables from obtained densities and excited states. However, there has been little opportunity to have interdisciplinary communication. On December 2022, we had the first workshop on this series (DFT2022) at Yukawa Institute for Theoretical Physics, Kyoto University, and several interdisiplinary discussions and collaborationd were started. To share such progresses and extend collaborations, we organize the second workshop. In this workshop, the current status and issues of each discipline will be shared towards solving these problems by meeting together among researchers in mathematics, nuclear physics, quantum chemistry, and condensed matter physics. This workshop mainly comprises lectures/seminars on cutting-edge topics and discussion, while a half-day session composed of contributed talks is also planned. This workshop is partially supported by iTHEMS-phys Study Group. This workshop is a part of the RIKEN Symposium Series. The detailed information can be found in the workshop website.

Venue: 8F, Integrated Innovation Building (IIB) (Main Venue) / via Zoom

Event Official Language: English

Can social issues be solved by mathematical science!? - Mathematical Research in Corporations

February 3 (Sat) 13:00 - 17:00, 2024

Continuing from the previous fiscal year, we will be hosting a symposium exploring the potential of solving societal issues through mathematical science research. In the past two years, the themes were "Attempts and Challenges" and "Connecting Corporate Issues and Mathematical Sciences." This year, we will focus on concrete examples under the title "Mathematical Research in Corporations" with the aim of introducing activities utilizing mathematics in the corporate sector. Currently, we are inviting speakers with diverse backgrounds, including researchers actively engaged in mathematical activities within corporations or those who have transitioned from corporate mathematical research to academic settings. We are particularly interested in learning about the experiences of individuals who have used mathematics in corporate settings. Additionally, there has been a growing trend in connecting activities of graduate students in mathematics with corporate endeavors. By sharing such initiatives with participants, we plan to conduct a panel session for exchanging opinions on the role of mathematical science in addressing societal issues through corporate collaboration in the future. We sincerely look forward to the active participation of corporate researchers and mathematicians who have an interest in these activities.

Venue: Hybrid Format (Noyori Conference Hall, Nagoya University and Zoom)

Event Official Language: Japanese

MCME SYMPOSIUM 2023

November 15 (Wed) - 16 (Thu) 2023

Kyosuke Adachi (Research Scientist, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS))
Hiroshi Kokubu (Executive Vice-President, Kyoto University)
Masaru Hongo (Assistant Professor, Department of Physics, Faculty of Science, Niigata University)

"MCME SYMPOSIUM 2023" will be held at the Musashino Center of Mathematical Engineering (MCME), Musashino University. This symposium is free of charge and open to everyone. Colleagues of iTHEMS will also be speaking. Below is an excerpt from the program. Wednesday, November 15, 11:20 - 12:30 Kyosuke Adachi Wednesday, November 15, 16:20 - 17:30 Hiroshi Kokubu Thursday, November 16, 10:00 - 11:10 Masaru Hongo Registration is open until November 14. Please register from the related links below. Organized by Musashino Center of Mathematical Engineering (MCME), Musashino University Co-organized by RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS)

Venue: Hybrid Format (Room 301, Building 5, Ariake Campus, Musashino University and Zoom)

Can social issues be solved by mathematical science!? - Connecting Corporate Issues and Mathematical Sciences -

January 7 (Sat) 13:00 - 17:00, 2023

Continuing from last year, we will hold a symposium to explore the possibility of solving social issues through mathematical research. Last year, under the theme of "Social Implementation of Mathematical Research!? - Attempts and Challenges -", we held talks by mathematical scientists working on mathematical problems extracted from corporate issues, and saw that efforts to address issues of interest at the individual researcher level are becoming more active. This year, under the broader theme of "Connecting" mathematical scientists and companies, we will introduce not only researchers who are strongly promoting joint research with companies, but also activities of companies who are collaborating with mathematical scientists from the standpoint of companies. We would like to organize a panel session to share with the participants not only the results of their activities but also the difficulties of the collaboration and the exchange of opinions on how to solve the problems. We are sincerely looking forward to the active participation of corporate researchers and mathematical scientists who are interested in such activities.

Venue: Hybrid Format (Noyori Conference Hall, Nagoya University and Zoom)

Event Official Language: Japanese

MCME SYMPOSIUM 2022

November 16 (Wed) - 17 (Thu) 2022

Takemasa Miyoshi (Team Leader, Data Assimilation Research Team, RIKEN Center for Computational Science (R-CCS))
Hidetoshi Taya (Special Postdoctoral Researcher, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS))
Hidetoshi Nishimori (Specially Appointed Professor, Tokyo Institute of Technology)

"MCME SYMPOSIUM 2022" will be held at the Musashino Center of Mathematical Engineering (MCME), Musashino University. This symposium is free of charge and open to everyone. Colleagues of iTHEMS will also be speaking. Below is an excerpt from the program. Wednesday, November 16, 13:30 - 14:40 Takemasa Miyoshi Thursday, November 17, 10:00 - 11:10 Hidetoshi Taya Thursday, November 17, 14:50 - 16:00 Hidetoshi Nishimori Registration is open until November 14. Please register from the related links below. Organized by Musashino Center of Mathematical Engineering (MCME), Musashino University Co-organized by RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS)

Venue: Hybrid Format (Room 301, Building 5, Ariake Campus, Musashino University and Zoom)

Can social issues be solved by mathematical science? -attempts and challenges

October 26 (Tue) 10:00 - 17:00, 2021

Tetsuo Hatsuda (Program Director, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS))
Masato Wakayama (Fundamental Mathematics Research Principal, NTT Institute for Fundamental Mathematics)
Takashi Sakajo (Professor, Division of Mathematics and Mathematical Sciences, Graduate School of Science, Kyoto University)
Shingo Iwami (Professor, Graduate School of Science, Nagoya University)
Hirotaka Irie (Assistant Manager, DENSO Corporation)

In recent years, the importance of mathematical sciences has been increasingly recognized in various fields, as exemplified by the rapid progress of AI technology and the development of DX (Digital Transformation) in companies. In academia, research centers have been established in fields such as space, materials, life, and medicine, where experts in the mathematical sciences play an important role in research activities in their respective fields. At the same time, the universality of mathematics and the quantitative and predictive nature of data analysis are also being considered useful in industry, and some companies are actively using mathematical science in their own business. Some companies are actively utilizing mathematical science in their business. In this symposium, researchers who are conducting research with the mission of returning research using mathematical science to society and implementing it will gather to discuss, based on the results of their cutting-edge research, "Can social issues be solved with mathematical science? -Attempts and Challenges" and discuss the role of mathematical science in society.

Venue: Hybrid Format (Noyori Conference Hall, Nagoya University and Zoom)

Event Official Language: Japanese

Symposium in Commemoration of Professor Iwasa's Retirement

March 26 (Fri) 16:30 - 17:30, 2021

Yoh Iwasa (Senior Advisor, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS) / Professor, Kwansei Gakuin University / Professor Emeritus, Kyushu University)

Program 16:30 - 17:30 "Biology and Mathematical Modeling --- A Report on Fun Days at Kobe Mita Campus Prof. Yoh Iwasa (School of Science and Technology, Kwansei Gakuin University) For details and registration, please refer to the related link below.

Venue: via Online

Event Official Language: Japanese

Symposium in Commemoration of Professor Emeritus Shun'ichi Amari receiving the Order of Culture

October 21 (Wed) 13:00 - 18:00, 2020

A symposium will be held to commemorate Professor Emeritus Shun'ichi Amari (Graduate School of Engineering, The University of Tokyo) receiving the 2019 Order of Culture. For more information and to book the event, please visit the Related Links (in Japanese).

Venue: via Online

Event Official Language: Japanese

MCME SYMPOSIUM 2020

October 15 (Thu) - 16 (Fri) 2020

Tetsuo Hatsuda (Program Director, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS))
Ryusuke Hamazaki (Senior Research Scientist, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS) / RIKEN Hakubi Team Leader, Nonequilibrium Quantum Statistical Mechanics RIKEN Hakubi Research Team, RIKEN Cluster for Pioneering Research (CPR))

"MCME SYMPOSIUM 2020" will be held at the Musashino Center of Mathematical Engineering of Musashino University. This symposium is free of charge and open to everyone. Some excerpts from the program: Friday, October 16 13:30-14:40 Dr. Ryusuke Hamazaki 14:50-16:00 Dr. Tetsuo Hatsuda For more information and to register for the symposium, please click on the relevant link.

Venue: via Online

Event Official Language: Japanese

2019 RIKEN Symposium: Understand to Predict the properties of Things and Matters through Computational Calculations ~ Data Science, Natural Intelligence and Category Theory~

December 23 (Mon) 9:50 - 18:10, 2019

This workshop is supported by RIKEN iTHEMS (RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program).

Venue: Okochi Hall

Event Official Language: Japanese

The 7th International Symposium on Data Assimilation (ISDA2019)

January 21 (Mon) - 24 (Thu) 2019

The symposium will focus on the cross-cutting issues shared in broad applications of data assimilation from geoscience to various physical and biological sciences. In particular, the symposium will enhance discussions among researchers with various background on, for example, non-Gaussian and nonlinear data assimilation problems, Big Data Assimilation (BDA), high-performance computation (HPC), Uncertainty Quantification (UQ), advanced intelligence (AI) and machine learning, multi-scale and multi-component treatments, observational issues, and mathematical problems. Abstract Submission Deadline: October 14, 2018 at 11:59 p.m. UTC Registration Deadline: December 16, 2018 at 11:59 p.m. UTC Submission/Registration Fee: Free

Venue: 6F auditorium, Computational Science Research Building

Event Official Language: English

International Symposium on Quantum Fluids and Solids (QFS)

July 25 (Wed) - 31 (Tue) 2018

The International Symposium on Quantum Fluids and Solids (QFS) will be held at Ito International Research Center (IIRC) on Hongo campus of the University of Tokyo, Japan, from July 25 through 31, 2018. One of the sponsors of this conference is iTHEMS. The QFS series started forty-three years ago making it one of the oldest series of international conferences in the field of low temperature physics. It has historically been focusing on physics of liquid and solid helium and hydrogen. But in this century its scope is expanding widely from laser cooled cold atoms to topological matters. At QFS2018 in Tokyo, this trend will be continued and with even more interdisciplinary aspects emphasized between the traditional subjects and those in broader physical systems.

Venue: Ito International Research Center (IIRC), Hongo Campus, The University of Tokyo

Event Official Language: English

Frontiers of nonequilibrium physics - Particle physics, cosmology, and condensed matter -

December 6 (Wed) - 8 (Fri) 2017

RIKEN Symposium・iTHES/iTHEMS Workshop

Venue: Suzuki Umetaro Hall

Event Official Language: Japanese

Interdisciplinary symposium on modern density functional theory

June 19 (Mon) - 23 (Fri) 2017

Density functional theory (DFT) is one of the most widely used methods for quantum many-body problems in condensed matter, nuclear physics, and quantum chemistry. Although we share similar theoretical frameworks and computational techniques, we sometimes use quite different languages, which sets a certain barrier for efficient interdisciplinary collaborations on modern DFT, in particular, that powered by High Performance Computing Infrastructure (HPCI). The key idea of this symposium is to have intensive interdisciplinary discussions and to initiate a new collaboration platform, in particular, by introducing the basic methodology and highlighting the latest hot topics in the fields condensed matter, nuclear physics, and quantum chemistry. iTHEMS-AICS-RNC-U.Tokyo joint symposium

Venue: Okochi Hall

Event Official Language: English