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
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
iTHEMS Biology welcomes 2 new members!
May 15 (Thu) at 13:00 - 14:15, 2025
Isaac Planas Sitja (Postdoctoral Researcher, Division of Fundamental Mathematical Science, RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS))
Antoine Diez (Research Scientist, Mathematical Application Research Team, Division of Applied Mathematical Science, RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS)) -
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
Topology and Brain Science
May 16 (Fri) at 14:00 - 15:30, 2025
Shiu Gary (Professor, Department of Physics, University of Wisconsin-Madison, USA)
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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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2025-05-01
Seminar ReportFrom Quarks to Neutron Stars: Insights from kHz gravitational waves on April 23, 2025
This conference focused on the role of high-frequency gravitational waves in advancing multi-messenger astrophysics. Key topics included binary neutron star mergers, such as GW170817, and future prospects for observing core-collapse supernovae using electromagnetic signals, neutrinos, and gravitational waves. Discussions highlighted the importance of kilohertz-band gravitational waves in probing the dense interiors of neutron stars, where exotic matter may exist. The seminar also introduced new detector concepts like NEMO in Australia and planned KAGRA upgrades aimed at enhancing high-frequency sensitivity. The event featured expert talks and posters, promoting collaboration and new research directions in nuclear and neutron star physics. Reported by Shuntaro Aoki
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2025-05-01
Paper of the WeekWeek 1, May 2025
Title: High energy extragalactic multimessenger backgrounds from starburst and dead galaxies Author: Ellis R. Owen, Yoshiyuki Inoue, Tatsuki Fujiwara, Albert K. H. Kong arXiv: 2504.18721 Title: Lindblad dynamics in holography Author: Takanori Ishii, Daichi Takeda arXiv: 2504.17320 Title: Explosive production of Higgs particles and implications for heavy dark matter Author: Seishi Enomoto, Nagisa Hiroshima, Kohta Murase, Masato Yamanaka arXiv: 2504.17127 Title: FRG analysis for relativistic BEC in arbitrary spatial dimensions Author: Fumio Terazaki, Kazuya Mameda arXiv: 2504.17668
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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
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 -
Hrushikesh Loya
Postdoctoral Researcher, University of Oxford, UKTerm: May 9 (Fri) - June 8 (Sun), 2025Visiting Place: RIKEN Wako Campus -
Michelle Hämmerle
Ph.D. Student, University of Vienna, AustriaTerm: May 17 (Sat) - 30 (Fri), 2025Visiting Place: RIKEN Wako Campus