Featured News
RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS) is an international research center at RIKEN. It facilitates close collaborations among researchers from different disciplines in theoretical, mathematical and computational sciences. On April 1, 2025, iTHEMS transitioned from a program to a center. The ultimate goal of iTHEMS is to unravel the mystery of the Universe, matter, and life, as well as to solve key problems in modern society through interdisciplinary approaches.
Upcoming Events
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Seminar
Supernova axion emissivity with Δ(1232) resonance in heavy baryon chiral perturbation theory
May 1 (Thu) at 16:00 - 17:30, 2025
Shu-Yu Ho (Postdoctoral Researcher, Institute of Physics, Academia Sinica, Taiwan)
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Seminar
The role of the visual information of fish schooling via selective decision-making
May 8 (Thu) at 16:00 - 17:00, 2025
Susumu Ito (Ph.D. Student, Department of Physics, Graduate School of Science, Tohoku University)
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Seminar
2d Cardy-Rabinovici model with the modified Villain lattice formulation
May 9 (Fri) at 14:00 - 15:00, 2025
Nagare Katayama (Ph.D. Student, Yukawa Institute for Theoretical Physics, Kyoto University)
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Seminar
The index of lattice Dirac operators and K-theory
May 15 (Thu) at 13:30 - 15:00, 2025
Hidenori Fukaya (Assistant Professor, Department of Physics, Osaka University)
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Seminar
Stable homotopy theory of invertible quantum spin systems
May 16 (Fri) at 16:00 - 18:00, 2025
Yosuke Kubota (Associate Professor, Graduate School of Science, Kyoto University)
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Seminar
Universality class for driven interfaces and... integrable spin hydrodynamics?
May 19 (Mon) at 15:00 - 17:00, 2025
Kazumasa A. Takeuchi (Associate Professor, Graduate School of Science, The University of Tokyo)
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Seminar
Ecology and Evolution of Mammal-Microbe Interactions
May 29 (Thu) at 16:00 - 17:00, 2025
Taichi A Suzuki (Assitant Professor, Biodesign Center for Health Through Microbiomes, Arizona State University, USA)
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Seminar
Extracting particle mass on quantum computers: state preparation and measurement
June 3 (Tue) at 11:00 - 12:30, 2025
Xiaoyang Wang (Postdoctoral Researcher, Quantum Mathematical Science Team, Division of Applied Mathematical Science, RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS))
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Seminar
From Galaxies to Cosmological Structures: The Multi-Scale Influence of Cosmic Rays
June 13 (Fri) at 14:00 - 15:15, 2025
Ellis Owen (Special Postdoctoral Researcher, Astrophysical Big Bang Laboratory, RIKEN Pioneering Research Institute (PRI))
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Workshop
iTHEMS-TheoryCenter(KEK) Scientific Writing and DEI Workshop
June 24 (Tue) - 25 (Wed), 2025
Ashleigh Griffin (Professor, Department of Biology, University of Oxford, UK)
Stuart West (Professor, Department of Biology, University of Oxford, UK)
Ryosuke Iritani (Senior Research Scientist, Division of Fundamental Mathematical Science, RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS)) -
Workshop
Recent Developments and Challenges in Tensor Networks: Algorithms, Applications to science, and Rigorous theories
July 28 (Mon) - August 8 (Fri), 2025
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Workshop
iTHEMS-NCTS Workshop
August 18 (Mon) - 21 (Thu), 2025
Opportunities
Latest News
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2025-04-24
Paper of the WeekWeek 4, April 2025
Title: Cosmic ray neutrons in magnetized astrophysical structures Author: Ellis R. Owen, Yoshiyuki Inoue, Tatsuki Fujiwara, Qin Han, Kinwah Wu arXiv: 2504.15802 Title: A magnetar powers the luminous supernova 2023pel, associated with a long gamma-ray burst Author: L. M. Roman Aguilar, M. M. Saez, K. Ertini, M. C. Bersten arXiv: 2504.11414 Title: Performance guarantees of light-cone variational quantum algorithms for the maximum cut problem Author: Xiaoyang Wang, Yuexin Su, Tongyang Li arXiv: 2504.12896 Title: Computing n-time correlation functions without ancilla qubits Author: Xiaoyang Wang, Long Xiong, Xiaoxia Cai, Xiao Yuan arXiv: 2504.12975
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2025-04-23
Hot TopiciTHEMS x academist online event was held on April 19, 2025
iTHEMS held an online lecture event for the general public with the help of Academist Inc., on April 19, 2025. This year’s speakers were Yuuka Kanakubo, Kan Kitamura, Leo Speidel, and Yuki Yokokura, who delivered clear and easy-to-understand lectures that even middle school students could comprehend. Each speaker also served as a commentator for other lectures and facilitated Q&A sessions based on audience questions. During the lunch break, as part of the lunch program, Director Iso, a physicist, and Prof. Fumiharu Kato, a mathematician, engaged in a discussion about the future possibilities of mathematics, moderated by Ms. Shinozaki. The event was organized and hosted by Ms. Michibayashi and Mr. Katada from Academist, who helped make the event a success. The event was attended by 414 people, and at one point there were over 250 in the audience.
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2025-04-17
Paper of the WeekWeek 3, April 2025
Title: Cohomology ring of unitary N=(2,2) full vertex algebra and mirror symmetry Author: Yuto Moriwaki arXiv: 2504.09919
Upcoming Visitors
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Visiting
Stuart West
Professor, Department of Biology, University of Oxford, UKTerm: April 10 (Thu) - July 7 (Mon), 2025Visiting Place: RIKEN Wako Campus -
Visiting
Ashleigh Griffin
Professor, Department of Biology, University of Oxford, UKTerm: April 10 (Thu) - July 7 (Mon), 2025Visiting Place: RIKEN Wako Campus