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16 events
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OthersMathematical Application Research Team Meeting #12
February 6 (Fri) 14:00 - 15:30, 2026
Riccardo Muolo (Special Postdoctoral Researcher, Division of Fundamental Mathematical Science, RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS))
Mathematical Application Research Team invites Riccardo Muolo fom Division of Fundamental Mathematical Science to this meeting. You are welcome to join the meeting. Title: Dynamics beyond nodes: a topological framework for oscillatory dynamics on higher-order networks Abstract: In recent years, increasing attention has been given to dynamical processes taking place on higher-order networks, where interactions are not limited to links, but may involve also higher-dimensional simplices [1]. While classical network models assume that state variables live on nodes and interact through links, many real systems — including brain, climate, and transportation systems — cannot be fully described within this node-centric perspective [2]. In this seminar, I will introduce the framework of higher-order networks and the concept of topological signals, namely, dynamical variables defined on simplices of higher dimensions. I will briefly present the basic tools required for this setting, including elementary notions of discrete calculus, discrete topology and geometric algebra, which serve as the mathematical foundation for modeling dynamical processes beyond the node-based paradigm. Next, I will discuss models of oscillatory dynamics extended to this framework. First, I will present the topological Kuramoto model [3], in which phases are not restricted to nodes but may also be associated with links, and where the coupling arises from the combinatorial structure of the simplicial complex. Then, I will introduce the discrete Hodge Laplacian and the Dirac-Bianconi operator [4], the former generalizing diffusive interactions to the higher-order setting, while the latter provides cross-talk between signals defined on simplices of different dimensions. Finally, I will introduce the notion of Dirac-Bianconi driven oscillators, where the dynamics of node- and link-signals coexist, interact and may give rise to collective oscillatory behaviors [5].
Venue: via Zoom
Event Official Language: English
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Others
Mathematical Application Research Team Meeting #11
December 12 (Fri) 15:00 - 16:30, 2025
So Matsuura (Professor, Department of Physics Hiyoshi, Keio University)
Mathematical Application Research Team invites Prof. So Matsuura from Keio University for this meeting. You are welcome to join the meeting. Title: Phases and Duality in Fundamental Kazakov-Migdal Model on the Graph Abstract: In this talk, we will explore the fundamental Kazakov-Migdal (FKM) model on a generic graph, where the partition function is represented by the Ihara zeta function weighted by unitary matrices. The effective action of the FKM model is described by a summation of all Wilson loops on the graph, which can be regarded as an extension of the usual Wilson action in lattice gauge theory. We show that the FKM model on regular graphs exhibits an exact strong/weak coupling duality, reflecting the functional equation of the Ihara zeta function. We also discuss the relation between the stability of the FKM model and the pole distribution of the Ihara zeta function. Interestingly, the FKM model universally exhibits the so-called Gross-Witten-Wadia (GWW) phase transitions. We estimate the phase structure of the FKM model in both small and large coupling regions, which is validated through numerical simulations. If time permits, we will examine the phase transition of the FKM model from the Young diagram perspective and discuss its relation with the GWW phase transition indicated by the eigenvalue distribution.
Venue: Seminar Room #359 (Main Venue) / via Zoom
Event Official Language: English
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Others
Kyoto University MACS Program Study Group RIKEN Visit and Research Exchange Meeting —Discussing the Cutting Edge with RIKEN Researchers—
December 12 (Fri) 12:30 - 15:10, 2025
12:00 – 13:30 Participate in Coffee Meeting 13:30 – 14:10 Okuto Morikawa (Special Postdoctoral Researcher, RIKEN iTHEMS) — Research Keywords: Lattice Field Theory, Conformal Field Theory, Quantum Field Theory, Particle Physics 14:10 – 14:30 Break 14:30 – 15:10 Ryosuke Iritani (Senior Research Scientist, RIKEN iTHEMS) — Research Keywords: Mathematical Biology, Evolutionary Ecology
Venue: #345-347, 3F, Main Research Building
Event Official Language: Japanese
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Others
Mathematical Application Research Team Meeting #10
November 14 (Fri) 16:00 - 17:00, 2025
Yoshiko Ogata (Professor, Research Institute for Mathematical Sciences (RIMS), Kyoto University)
Mathematical Application Research Team invites Prof. Yoshiko Ogata from RIMS for this meeting. Her talk title will be announced later. You are welcome to join the meeting. The title and the abstract of her talk are: Title: Mixed state topological order: operator algebraic approach Abstract: We consider anyons in mixed states of two-dimensional quantum spin systems within the operator-algebraic framework of quantum statistical mechanics. To each state satisfying a mixed-state version of approximate Haag duality, we associate a braided C*-tensor category, which we interpret as describing the anyonic excitations of the state. We then investigate how these anyonic structures behave under interactions with the environment.
Venue: #359, Seminar Room #359 (Main Venue) / via Zoom
Event Official Language: English
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Others
Mathematical Application Research Team Meeting #9
October 10 (Fri) 13:30 - 14:30, 2025
Antoine Diez (Research Scientist, Mathematical Application Research Team, Division of Applied Mathematical Science, RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS))
In this meeting, Antoine Diez will give a talk entitled "Mean-field limits a la Tanaka and large deviations for particle systems with network interactions." Feel free to join if you are interested.
Venue: #359, 3F, Main Research Building (Main Venue) / via Zoom
Event Official Language: English
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Others
iTHEMS Now & Next 2025
July 24 (Thu) - 25 (Fri) 2025
We will hold this fiscal year’s annual in-house gathering, “iTHEMS NOW & NEXT,” as follows. This event is a rare opportunity for all iTHEMS members, including visiting researchers, to gain a comprehensive overview of iTHEMS’s current activities and future directions. Program July 24th 9:30-9:45 Opening by Director Iso 9:45-10:10 Keynote lecture Sonia Mahmoudi 10:10-10:35 Keynote lecture Masazumi Honda 10:35 20-min break 10:55 Fundamental Quantum Science Program (FQSP) introduction Working Group introduction 5-min each 11:30 Lunch break 13:30 Teams introduction part 1 RIKEN-Berkeley Center RIKENｰBerkeley Center (Shigehiro Nagataki) Mathematical Application Research Team (Motoko Kotani / Tsukasa Tada) 13:50 11 SG Presentation 5 min each 14:45 break 15:00 Flash talks & Poster session 18:00 Reception July 25th 9:30 Keynote lecture Yuto Yamamoto 9:55 Keynote lecture Kyosuke Adachi 10:20 break 10:40 Teams introduction part 2 Prediction Science Research Team (Takemasa Miyoshi) Medical Science Deep Learning Team (Jun Seita) Medical Science Data-driven Mathematics Team (Eiryo Kawakami) Quantum Mathematical Science Team (Tetsuo Hatsuda) Mathematical Social Science Team (Yohsuke Murase) 11:30 Lunch 13:30 Flash Talk & Poster presentation 16:30 Concluding remark
Venue: 2F Large Conference Room, Administrative Headquarters, RIKEN Wako Campus (Main Venue) / via Zoom
Event Official Language: English
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Others
DA-ML Study Group: Error Covariance
July 23 (Wed) 9:00 - 10:00, 2025
Tristan Hascoet (Research Scientist, Data Assimilation Research Team, RIKEN Center for Computational Science (R-CCS))
Venue: via Zoom / R511, Computational Science Research Building
Event Official Language: English
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Others
6th Mathematical Application Research Team meeting
July 4 (Fri) 11:00 - 12:00, 2025
阪田 直樹 Sakata (Assistant Professor, Mathematical Science Group, Advanced Institute for Materials Research (AIMR), Tohoku University)
Venue: via Zoom / #359, Seminar Room #359
Event Official Language: English
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Others
Visit by ASCENT-6E high school students
January 13 (Mon) 10:40 - 16:00, 2025
PROGRAMME Visit of students enrolled in the ASCENT Program at Chiba University Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS): RIKEN Wako Campus (Wako City, Saitama) Event date: Monday, January 13th, 2025 ASCENT-6E Program: iTHEMS members: Schedule 10:30-10:40 (10 min): Arriving procedure 10:40-11:00 (20 min) at meeting room on the 4th floor, Main Research Building Introduction of students (to hear their names and scientific fields of interest). We will provide colour-coded badges to write their names and the colour would represent their field of interest (e.g., blue for biology, green for math, red for physics). 11:00-11:10 (10 min) Bathroom break 11:10-12:00 (50 min) at meeting room on the 4th floor, Main Research Building First set of talks by iTHEMS members (10 min each) Tetsuo Hatsuda (Physics, mathematics) Catherine Beauchemin (Physics, biology) Tsukasa Tada (Physics, mathematics) Gen Kurosawa (Biology) Misako Tatsuuma (Physics) 12:00-12:50 (50 min) at Common Space in the 4th floor of Main Research Building (tentative) Discussion Lunch with students 12:50-13:40 (50 min) at meeting room on the 4th floor, Main Research Building Second set of talks by iTHEMS members (10 min each) Akihisa Yamamoto (Physics, biology) Ryo Namba (Physics) Christy Kelly (Mathematics, physics) Rumi Hasegawa (Physics) Jose Gutierrez (Biology) 13:40-13:50 (10 min) at meeting room on the 4th floor, Main Research Building Brief overview of iTHEMS and RIKEN programmes (T.Hatsuda, C.Beauchemin, or T. Tada) (e.g., JRA, IPA, SPDR, RS/SRS) 13:50-14:00 (10 min) Bathroom break 14:00-14:15 (15 min) at meeting room on the 4th floor, Main Research Building (tentative) Short statements by Prof. Jun Nomura and ASCENT program coordinators Qian Wang and Hina Morishige 14:15-16:00 (105 min) at Common Space in the 4th floor of Main Research Building (tentative) Informal discussions among ASCENT program students and iTHEMS members over some snacks and coffee. iTHEMS members will spread at different areas in the common space of 3rd floor and will display posters or conduct activities that can facilitate discussion. If posters are used, they may be the ones used in the Now & Next or new ones.
Venue: #435-437, 4F, Main Research Building
Event Official Language: English
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Others
Visit by MACS SG Students
September 2 (Mon) - 3 (Tue) 2024
Monday, September 2nd 13:20–13:30: Opening 13:30–13:40: Self-introductions 13:40–14:10: Introduction to iTHEMS 14:10–14:30: Coffee Break 14:30–15:30: Seminar by iTHEMS Researcher (Dr. Moriwaki) 16:30–18:00: Laboratory Visit (Kazama Lab) 18:30–20:00: Research Presentation/ Discussion Session Tuesday, September 3rd 10:00–10:20: Tour of iTHEMS Facilities 10:40–12:10: Laboratory Visit (Tatara Lab) 12:20–13:20: Lunch/Coffee Break 13:30–15:00: Laboratory Visit (Tamagawa Lab) 15:30–17:00: Laboratory Visit (Isomura Lab) 17:20–17:30: Closing
Venue: Seminar Room #359
Event Official Language: Japanese
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Others
What will Happen to iTHEMS⊗Masason Foundation Members?
August 2 (Fri) 13:30 - 17:30, 2024
Venue: Seminar Room #359
Event Official Language: English
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Others
iTHEMS NOW & NEXT 2024
July 19 (Fri) 9:30 - 18:00, 2024
9:30-10:00 Keynote by Lucy Mcneill 10:00-10:30 Keynote by Jose Said Gutierrez Ortega 10:35-11:05 Keynote by Puttarak Jai-akson 11:05-11:35 Keynote by Kannaka Kazuki 11:35-12:30 Lunch Time Session 12:30-13:30 Working Group / Study Group Report 13:30-15:30 Flash Talk & Poster Presentation Part 1 15:30-17:30 Flash Talk & Poster Presentation Part2 17:30 Concluding Remarks by the Director 18:00 reception
Venue: 2F Large Conference Room, Administrative Headquarters, RIKEN Wako Campus (Main Venue) / via Zoom
Event Official Language: English
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Others
SLMath Summer Graduate School "h-principle"
July 1 (Mon) - 12 (Fri) 2024
Venue: TOKYO ELECTRON House of Creativity, Katahira Campus, Tohoku University
Event Official Language: English
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Others
New horizons in immersive visualization at iTHEMS
March 14 (Thu) 14:00 - 16:00, 2024
Gilles Ferrand (Adjunct Professor, Department of Physics and Astronomy, University of Manitoba, Canada)
Visualization is an essential part of research, both to explore one’s data and to communicate one’s findings with others. Data that are 3-dimensional can be explored in a more natural way using virtual reality devices. iTHEMS recently purchased new VR headsets with advanced capabilities (Meta Quest Pro). The meeting will start with a general introduction to the current state of the VR space. Then, participants may individually experience a demonstration with the new headsets (showing research done at the ABBL on supernovae and their remnants). There will be ample time for questions and discussions. Come and discover how such tools can be used to enhance our research.
Venue: 3rd floor public space, Main Research Building
Event Official Language: English
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Others
Seoul National University student group visit
January 10 (Wed) 14:00 - 20:00, 2024
Catherine Beauchemin (Deputy Program Director, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS))
Akinori Tanaka (Senior Research Scientist, RIKEN Center for Advanced Intelligence Project (AIP))
Misako Tatsuuma (Research Scientist, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS))
Ryo Namba (Senior Research Scientist, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS))
Dongwook Ghim (Postdoctoral Researcher, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS))
Steffen Backes (Senior Research Scientist, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS))A group of 22 undergraduate students in the GLEAP programme at Seoul National University will visit iTHEMS to hear short talks by our members, exchange one-on-one, and visit our facilities. I would like to encourage all available iTHEMS members to take part in this event which will be held in different spaces throughout the day, all at the RIKEN Wako campus Main Research Building: 15:50-16:10 at iTHEMS Common Room (#246-248) Coffee break with iTHEMS members and SNU visitors 16:10-17:50 on 4th floor, room #435-437 Short talks by iTHEMS members 18:05-18:30 in 3rd floor common space Short intro talks by SNU visitors 18:30-20:00 in 3rd floor common space Free informal discussion between SNU visitors and iTHEMS members over some light food [Note some slight changes in the times previously announced]
Venue: 3rd floor public space, Main Research Building / #435-437, Main Research Building / Common Room #246-248
Event Official Language: English
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Others
First Chalk
March 29 (Wed) 16:30 - 17:00, 2023
The occasion to celebrate the launch of the new seminar room will take place after iTHEMS NOW & NEXT.
Venue: Seminar Room #359
Event Official Language: English
16 events