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
iTHEMS Biology Study Group April Launch Meeting (Part 2)
April 10 (Thu) at 16:00 - 17:00, 2025
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Seminar
Artificial Intelligence and Neuroscience
April 11 (Fri) at 14:00 - 15:30, 2025
Junichi Chikazoe (Professor, Center for Brain,Mind and KANSEI Sciences Research, Hiroshima University)
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Special Lecture
iTHEMS x academist Online Event "World of Mathematical Sciences 2025"
April 19 (Sat) at 10:00 - 15:30, 2025
Yuuka Kanakubo (Postdoctoral Researcher, Division of Fundamental Mathematical Science, RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS))
Kan Kitamura (Special Postdoctoral Researcher, Division of Fundamental Mathematical Science, RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS))
Leo Speidel (RIKEN ECL Research Unit Leader, Mathematical Genomics RIKEN ECL Research Unit, Division of Fundamental Mathematical Science, RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS))
Yuki Yokokura (Senior Research Scientist, Division of Fundamental Mathematical Science, RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS)) -
Colloquium
The 28th MACS Colloquium
April 25 (Fri) at 14:45 - 18:30, 2025
Shizuo Kaji (Professor, Institute of Mathematics for Industry, Kyushu University / Professor, Center for Science Adventure and Collaborative Research Advancement (SACRA), Graduate School of Science, Kyoto University)
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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
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 Cluster for Pioneering Research (CPR))
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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
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Seeking Postdoctoral Researcher, Research Scientist or Senior Research Scientist (W24328)
Deadline: Open until filled
Postdoctoral Researcher, Research Scientist or Senior Research Scientist, about 6 positions. iTHEMS is seeking researchers to join RIKEN Quantum, a cross-disciplinary initiative leveraging quantum computers and simulators to drive innovation across physics, chemistry, life sciences, humanities, computational science, and information science.
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Call for applications for the position of Special Postdoctoral Researcher (SPDR) for FY 2026
Deadline: April 3, 2025
RIKEN is currently accepting applications for the FY 2026 Special Postdoctoral Researcher (SPDR) Program, from young, creative, independent researchers who will be a powerful force in furthering RIKEN’s research activities.
Latest News
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2025-04-03
Person of the WeekSelf-introduction: Erik Loetstedt
I have a PhD in theoretical physics from Heidelberg University and have worked at the Max Planck Institute for Nuclear Physics, Missouri University of Science and Technology and The University of Tokyo before coming to RIKEN. I am interested in time-dependent problems in quantum mechanics, in particular strong field-molecule interaction. I am also interested in the simulation of quantum dynamics of molecules by quantum computers.
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2025-04-03
Paper of the WeekWeek 1, April 2025
Title: Higgs-Modular Inflation Author: Shuntaro Aoki, Hajime Otsuka, Ryota Yanagita arXiv: http://arxiv.org/abs/2504.01622v1 Title: The untangling number of 3-periodic tangles Author: Toky Andriamanalina, Sonia Mahmoudi, Myfanwy E. Evans arXiv: http://arxiv.org/abs/2504.01747v1 Title: Universality of Rényi Entropy in Conformal Field Theory Author: Yuya Kusuki, Hirosi Ooguri, Sridip Pal arXiv: http://arxiv.org/abs/2503.24353v1 Title: Unstable chords and destructive resonant excitation of black hole quasinormal modes Author: Naritaka Oshita, Emanuele Berti, Vitor Cardoso arXiv: http://arxiv.org/abs/2503.21276v1 Title: Non-perturbative formulation of resonances in quantum mechanics based on exact WKB method Author: Okuto Morikawa, Shoya Ogawa arXiv: http://arxiv.org/abs/2503.18741v2 Title: A Promising Method for Strongly Correlated Electrons in Two Dimensions: Gutzwiller-Guided Density Matrix Renormalization Group Author: Hui-Ke Jin, Rong-Yang Sun, Hong-Hao Tu, Yi Zhou arXiv: http://arxiv.org/abs/2503.18374v1 Title: Effective field theory for weakly bound two-neutron halo nuclei: corrections from neutron-neutron effective range Author: Davi B. Costa, Masaru Hongo, Dam Thanh Son arXiv: http://arxiv.org/abs/2503.18519v1 Title: Path to an exact WKB analysis of black hole quasinormal modes Author: Taiga Miyachi, Ryo Namba, Hidetoshi Omiya, Naritaka Oshita arXiv: http://arxiv.org/abs/2503.17245v1 Title: Observation of Two Cascading Screening Processes in an Iron-based Superconductor Author: Ming-Hua Chang, Steffen Backes, Donghui Lu, Nicolas Gauthier, Makoto Hashimoto, Guan-Yu Chen, Hai-Hu Wen, Sung-Kwan Mo, Zhi-Xun Shen, Roser Valenti, Heike Pfau arXiv: http://arxiv.org/abs/2503.06314v1 Title: Monte Carlo study on Heisenberg model with local dipolar interaction Author: Etsuko Itou, Akira Matsumoto, Yu Nakayama, Toshiki Onagi arXiv: http://arxiv.org/abs/2503.15874v2
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2025-04-01
Hot TopicFarewell message from Daiki Kumakura
Our colleague, Daiki Kumakura, joins R&D Division at Daiichi Sankyo Co. as Translational Scientist after receiving PhD last week from Hokkaido University. We wish him the best of luck in this new endeavor. Here is a message from Daiki: I joined iTHEMS as a Junior Research Associate (JRA) in April 2022, and since then I have been fortunate to experience a wealth of opportunities and engaging discussions that go far beyond what I encountered at university. When I started as a JRA, I set myself the dual goals of advancing both research and education. In research, I pursued mathematical and computational analyses with a focus on microbial themes. In education, I established a Young Researchers in Mathematical Biology group for students and organized a summer school. Additionally, I participated in public outreach by designing a “one poster per family” project, and through appearances on FM radio and our university’s YouTube channel, I helped spread the excitement of mathematical science and the unique identity of iTHEMS to students throughout Japan. I am deeply grateful to the many individuals at iTHEMS whose support made all of these endeavors possible. Thank you from the bottom of my heart. Starting in April 2025, I will be embarking on a new chapter as a Translational Scientist at Daiichi Sankyo Co., Ltd. In this role, I will analyze and interpret clinical trial data across various disease areas, including cancer, with the aim of enabling faster and more appropriate drug prescriptions for patients. I look forward to applying the invaluable experiences I gained at iTHEMS to establish a strong position for mathematical science in industrial applications. My career has flourished thanks to iTHEMS, and I sincerely wish for the continued growth and success of the iTHEMS community. I hope to maintain close ties with all of you in the future. Thank you very much for everything.
Upcoming Visitors
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Visiting
Taishi Kawamoto
Ph.D. Student / JSPS Research Fellow DC, Yukawa Institute for Theoretical Physics, Kyoto UniversityTerm: April 2 (Wed) - 5 (Sat), 2025Visiting Place: RIKEN Wako Campus -
Satsuki Hirasawa
Master's Student, Graduate School of Information Science and Technology, Hokkaido UniversityTerm: April 14 (Mon) - 18 (Fri), 2025Visiting Place: RIKEN Wako Campus