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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SeminarAI and Scientific Discovery
October 19 (Mon) 13:00 - 14:00, 2026
Joseph Ledsam (Google Health Lead, Japan, Google Japan)
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Workshop
Mini-Workshop: Quantum Frontiers — From Molecules to Quarks and the EIC
October 20 (Tue) 9:45 - 17:00, 2026
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Special LectureQuantum 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)
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Seminar
Bubble wall dynamics from non-equilibrium quantum field theory
October 21 (Wed) 13:30 - 15:00, 2026
Matthias Carosi (Postdoctoral Researcher, International Centre for Theoretical Physics Asia-Pacific (ICTP-AP), University of Chinese Academy of Sciences, China)
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SeminarData assimilation with the full covariance on a fault-tolerant quantum computer
October 21 (Wed) 15:00 - 16:30, 2026
Takemasa Miyoshi (Team Principal, Data Assimilation Research Team, RIKEN Center for Computational Science (R-CCS))
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SeminarObservability-based causal inference in linear stochastic systems with hidden inputs
October 22 (Thu) 13:00 - 14:00, 2026
Daiki Sekizawa (Special Postdoctoral Researcher, Laboratory for Neural Computation and Adaptation, RIKEN Center for Brain Science (CBS))
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Seminar
An Origin Story for Money
October 22 (Thu) 15:00 - 16:00, 2026
Stephen Marsland (Professor, Victoria University of Wellington, New Zealand)
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SeminarBirational rigidity of singular Fano threefolds
October 23 (Fri) 14:00 - 16:00, 2026
Chi-Kang Chang (Special Postdoctoral Researcher, Division of Fundamental Mathematical Science, RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS))
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SeminarBorn-Oppenheimer EFT: an unified description of ordinary and exotic quarkonia
October 27 (Tue) 13:30 - 15:00, 2026
Nora Brambilla (Professor, TUM School of Natural Sciences, Technical University of Munich, Germany)
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Seminar
Exploring Noisy Quantum Thermodynamical Processes via the Depolarizing-Channel Approximation
October 28 (Wed) 16:00 - 17:00, 2026
Jian Li (Ph.D. Student, Center for Theoretical Physics, Polish Academy of Sciences, Poland)
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Seminar
Maximal Enhancements in Eight-Dimensional Non-Supersymmetric Heterotic Strings
October 30 (Fri) 10:30 - 12:00, 2026
Yuefeng Liu (Academic Researcher, Institute for Advanced Study,, Kyushu University)
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Seminar
Quantum Creation of the Universe: Reassessing the No-Boundary and Tunneling Proposals
October 30 (Fri) 14:00 - 15:00, 2026
Hiroki Matsui (Researcher, Osaka Central Advanced Mathematical Institute, Osaka Metropolitan University)
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Meeting
Mathematical Application Research Team Meeting #20
October 30 (Fri) 15:30 - 16:45, 2026
Yuya Kodama (Assistant Professor, Graduate School of Science and Engineering, Kagoshima University)
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Seminar
Scaling regimes of the 1D Kuramoto-Sivashinsky equation
November 5 (Thu) 17:00 - 18:30, 2026
Liubov Gosteva (Ph.D. Student, LPMMC, Université Grenoble Alpes, France)
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Workshop
Holography and Observables in Quantum Gravity
November 9 (Mon) - 13 (Fri) 2026
Keiichiro Furuya (Project Researcher, Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU), The University of Tokyo)
Moshe Rozali (Professor, The University of British Columbia, Canada)
Tadashi Takayanagi (Professor, Yukawa Institute for Theoretical Physics, Kyoto University)
Mengyang Zhang (Project Researcher, Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU), The University of Tokyo)
Martin Sasieta (Postdoctoral Researcher, University of California, Berkeley, USA)
Pawel Caputa (Professor, Stockholm University, Sweden) -
SeminarTopological properties of empirical fitness landscapes from merge trees
November 9 (Mon) 13:00 - 14:00, 2026
Igors Dubanevics (Ph.D. Student, Okinawa Institute of Science and Technology Graduate University (OIST))
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WorkshopGood Enough Computing in Science
November 10 (Tue) 10:00 - 15:00, 2026
Igors Dubanevics (Ph.D. Student, Okinawa Institute of Science and Technology Graduate University (OIST))
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SeminarA non-negative matrix factorization-based approach to integrating multimodal omics data with automatically tuned hyperparameters
November 16 (Mon) 14:00 - 15:00, 2026
Dorothy Ellis (Postdoctoral Researcher, Laboratory for Integrative Genomics, RIKEN Center for Integrative Medical Sciences (IMS))
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Seminar
Quantum Simulation of Non-Equilibrium Dynamics in SU(2) and SU(3) Lattice Gauge Theories
November 24 (Tue) 15:00 - 16:30, 2026
Xiaojun Yao (Research Assistant Professor, University of Washington, USA)
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Workshop
KEK(-iTHEMS) Theory Workshop 2026
November 25 (Wed) - 27 (Fri) 2026
Hirotaka Hayashi (Professor, Department of Physics, School of Science, Tokai University)
Hikaru Kawai (Visiting Professor, Nambu Yoichiro Institute of Theoretical and Experimental Physics (NITEP), Osaka Metropolitan University)
Takato Mori (Assistant Professor, Department of Physics, Faculty of Science, Rikkyo University)
Masaya Nakagawa (Assistant Professor, Department of Physics, Graduate School of Science, The University of Tokyo)
Masaki Shigemori (Professor, Department of Physics, Graduate School of Science, Nagoya University)
Tadashi Takayanagi (Professor, Yukawa Institute for Theoretical Physics, Kyoto University)
Norihiro Tanahashi (Program-Specific Associate Professor, Department of physics, Graduate School of Science, Kyoto University)
Tatsuya Yamaoka (Ph.D. Student, Department of Physics, Graduate School of Science, The University of Osaka) -
Seminar
Rare k-mers reveal centromere haplogroups underlying human diversity and cancer translocation
November 26 (Thu) 13:00 - 14:00, 2026
Yuichi Shiraishi (Chief, Division of Genome Analysis Platform Development, National Cancer Center Japan)
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Seminar
Hamiltonian simulation: Standard algorithms and recent developments
December 17 (Thu) 10:30 - 17:00, 2026
Kaoru Mizuta (Associate Professor, Center for Quantum Information and Quantum Biology, The University of Osaka)
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SeminarOptimal transport: Thermodynamics, biological information processing and generative models
January 18 (Mon) 13:30 - 15:00, 2027
Sosuke Ito (Associate Professor, Graduate School of Science, The University of Tokyo)
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Meeting
iTHEMS NOW & NEXT 2027
July 13 (Tue) - 15 (Thu) 2027
Opportunities
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Seeking a few Postdoctoral Researchers (26-1454)
Deadline: Open until filled
iTHEMS is seeking a Postdoctoral Researcher to join the Category Theoretical Physics RIKEN ECL Research Unit and work with Principal Investigator Kantaro Ohmori on the JST PRESTO research project “Lattice Construction of Quantum Phases via Higher Complete Sets” under the research area “Uncharted Quantum.”
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Seeking a few Senior Research Scientists, Research Scientists, Postdoctoral Researchers (26-1354)
Deadline: November 20, 2026
iTHEMS is seeking Senior Research Scientists, Research Scientists, and Postdoctoral Researchers to conduct research in mathematics, including algebra, geometry, analysis, and other areas.
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Seeking a Few Administrative Part-time Workers (26-1290)
Deadline: Open until filled
iTHEMS is seeking a part-time administrative staff member to work alongside our current assistants, supporting a range of administrative tasks related to accounting, general affairs, and human resources.
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Seeking a few Administrative Assistants (26-1051)
Deadline: November 30, 2026
iTHEMS is seeking a few administrative assistants to be responsible for general administrative and operational duties for the Center's laboratories (mainly the Medical Science Data-driven Mathematics Team, Division of Applied Mathematical Science) as well as for the Center as a whole.
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Seeking a few Research Scientists or Postdoctoral Researchers (26-428)
Deadline: Open until filled
Research Scientists or Postdoctoral Researchers, a few positions. We invite applications from researchers who are motivated to advance foundational research in artificial intelligence (AI), particularly deep learning, in order to develop more advanced AI technologies and to pioneer their applications in the natural sciences.
Latest News
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2026-10-15
Paper of the WeekWeek 3, October 2026
Title: Assessing evolutionarily significant units in a widespread species: morphology, demography, and adaptive divergence support multiple lineages in the southern range of Dioon tomasellii (Zamiaceae) Author: Brian L. Dorsey, José Said Gutiérrez-Ortega, Miguel Angel Pérez-Farrera, Timothy J. Gregory Journal Reference: Conservation Genetics doi: https://doi.org/10.1007/s10592-026-01845-z Title: How do variable patch sizes hold higher beta diversity? Author: Minagi Naka, Akira S Mori, Ryosuke Iritani Journal Reference: bioRxiv doi: https://doi.org/10.64898/2026.09.29.755527 Title: Evolutionary invasion analysis for structured populations: a synthesis Author: Ryosuke Iritani, Troy Day Journal Reference: bioRxiv doi: https://doi.org/10.64898/2026.03.23.713828 Title: The Evolutionary and Ecological Consequences of Cooperation Author: Stuart A. West, Anna E. Dewar, Ryosuke Iritani, Laurence. J. Belcher, Ashleigh S. Griffin Journal Reference: The American Naturalist, 207(4), 467-482 doi: https://doi.org/10.1086/739292 Title: Codimension-Zero Holographic Complexity and Spectral Three-Point Correlators Author: Masamichi Miyaji, Shan-Ming Ruan, Shono Shibuya, Kazuyoshi Yano arXiv: http://arxiv.org/abs/2610.13289v1 Title: Searching for Charged Lepton Flavor Violation Author: Lorenzo Calibbi, Kaori Fuyuto, Matthias Heinz, Jure Zupan arXiv: http://arxiv.org/abs/2610.11839v1 Title: Reconstructing BPS String Charge Cone in 6d N=(1,0) Supergravity Author: Yuta Hamada, Hee-Cheol Kim, Kai Xu arXiv: http://arxiv.org/abs/2610.10711v1
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2026-10-09
Hot Topic
Helping AI Recognize Shapes through Event Cameras: Paper by Masato Taki and Colleagues Accepted at NeurIPS 2026
A paper by Masato Taki, Team Director of the AI as Science Team at RIKEN iTHEMS and Associate Professor at Rikkyo University, together with Soshun Kihara and Shunsuke Yasuki, graduates of Rikkyo University's Graduate School of Artificial Intelligence and Science, has been accepted at NeurIPS 2026, a leading international conference in AI and machine learning. The researchers used knowledge distillation to transfer what an AI model learned from event-camera data, which capture changes in brightness at individual pixels, to a model processing conventional color images. The resulting model relied more on object shapes than on color or texture and became less sensitive to color changes and fine-grained noise. For details, please see Rikkyo University's press release via the related link.
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2026-10-08
Paper of the WeekWeek 2, October 2026
Title: Quantum Algorithms for Finding Vacua in the ADK Landscape Author: Shirabe Endo, Yuta Hamada arXiv: http://arxiv.org/abs/2610.07439v1 Title: Spin-1 Bulk Local States in AdS/CFT and Carrollian Holography Author: Peng-Xiang Hao, Kotaro Shinmyo, Kenta Suzuki, Yu-ki Suzuki, Shunta Takahashi arXiv: http://arxiv.org/abs/2610.07548v1 Title: Gravitational-wave Echoes Beyond the Hubble Time from Quantum Black Holes Author: Che-Yu Chen, Naritaka Oshita, Yuki Yokokura arXiv: http://arxiv.org/abs/2610.05886v1 Title: Entanglement Requires Fluctuations at Conformal Interfaces Author: Yuya Kusuki, Kosei Suzuyama, Yin Tang arXiv: http://arxiv.org/abs/2610.02309v1 Title: XMM-Newton Resolves Parsec-scale X-ray Jets in the PeVatron Microquasar V4641 Sgr Author: Naomi Tsuji, Caterina Tresoldi, Kaya Mori, Hiromasa Suzuki, Matthew Lundy, Dmitry Khangulyan, Samar Safi-Harb, Laura Olivera-Nieto, Felix Aharonian, Shotaro Abe, Zhen Cao, Sabrina Casanova, Maria Chernyakova, Yi-Heng Chi, Stephane Corbel, E. de la Fuente, Hua Feng, Tatsuki Fujiwara, Noa Grollimund, Dezhi Huang, Yoshiyuki Inoue, Ryohei Kanazashi, Shigeo S. Kimura, Marianne Lemoine-Goumard, Jonathan Mackey, Alessio Marino, Samaresh Mondal, Kai Morita, Maxime Parra, Gabriele Ponti, Brian Reville, Megumi Shidatsu, Shunya Takekawa, Michelle Tsirou, Xiaojie Wang, Heshou Zhang, Ping Zhou arXiv: http://arxiv.org/abs/2610.02966v1 Title: Quantum Krylov Learning Author: Shunji Matsuura, Yoji Kawamura, Joseph Salfi, Satoshi Iso arXiv: http://arxiv.org/abs/2610.00537v1 Title: Generative Modeling of Stochastic Dynamics for Long-Time Evolution Author: Yang-yang Tan, Jinyang Li, Lingxiao Wang arXiv: http://arxiv.org/abs/2610.00546v1 Title: Dissipation-Sensitivity Trade-Off in Dissipative Bosonic Systems Author: Kohei Yoshimura, Ryusuke Hamazaki arXiv: http://arxiv.org/abs/2610.01112v1 Title: Quantum computing for neuroscience: opportunities beyond classical limits Author: Annemarie Wolff, Alexandre Choquette, Georg Northoff, Atsushi Iriki, Guillaume Dumas Journal Reference: Nat. Rev. Neurosci. (2026) doi: https://doi.org/10.1038/s41583-026-01083-9
Upcoming Visitors
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Visiting
Yang-Yang Tan
Postdoctoral Researcher, Institute for Physics of Intelligence, Graduate School of Science, The University of TokyoTerm: May 1 (Fri) 2026 - April 30 (Fri) 2027Visiting Place: Main Research Building, RIKEN Wako Campus -
Visiting
Liang Zhang
Visiting Scientist, Quantum Mathematical Science Team, Division of Applied Mathematical Science, RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS) / Postdoctoral Researcher, Institute of Modern Physics, Fudan University, ChinaTerm: September 4 (Fri) - November 3 (Tue) 2026Visiting Place: Main Research Building, RIKEN Wako Campus