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Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS) is an international research program at RIKEN. It facilitates close collaborations among researchers from different disciplines in theoretical, mathematical and computational sciences. 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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Others Tomorrow
Visit by ASCENT-6E high school students
January 13 (Mon) at 10:40 - 16:00, 2025
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Seminar
Principles of the evolution of human social structures: kinship and gift-giving
January 16 (Thu) at 16:00 - 17:15, 2025
Kenji Itao (Special Postdoctoral Researcher, Computational Group Dynamics Collaboration Unit, RIKEN Center for Brain Science (CBS))
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Seminar
Probabilistic approach to discrete integrable systems
January 17 (Fri) at 15:30 - 17:30, 2025
Makiko Sasada (Professor, Graduate School of Mathematical Sciences, The University of Tokyo)
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Seminar
Investigating the Crust Urca Process in Accretion Neutron Stars: Implications for Superburst Ignition and Hot Cooling Curve of MAXI J0556-332
January 24 (Fri) at 14:00 - 15:15, 2025
Hao Huang (Ph.D. Student, Institute of Modern Physics, China)
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Seminar
Seminar Series for Junior and Senior High School Girls: 'What Should Students Prepare for Their Future in the Age of AI?'
January 25 (Sat) at 14:00 - 18:30, 2025
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Seminar
Architectures and algorithms for early FTQC
January 27 (Mon) at 16:00 - 17:15, 2025
Andreas Thomasen (R&D Engineer, QunaSys Inc.)
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Seminar
Quantum Error Mitigation
January 28 (Tue) - 29 (Wed), 2025
Suguru Endo (Ph.D. Researcher, Research Center for Theoretical Quantum Information, NTT Computer and Data Science Laboratories)
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Seminar
D-modules and the Riemann-Hilbert correspondence as a foundation for mixed Hodge modules
January 31 (Fri) at 14:00 - 16:00, 2025
Takahiro Saito (Assistant Professor, Faculty of Science and Engineering, Chuo University)
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Seminar
Introduction to the stochastic process and its application in physics
February 4 (Tue) - 5 (Wed), 2025
Kiyoshi Kanazawa (Associate Professor, Division of Physics and Astronomy, Graduate School of Science, Kyoto University)
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Seminar
Master equations for general non-Markovian processes: the Hawkes process and beyond
February 5 (Wed) at 16:30 - 18:00, 2025
Kiyoshi Kanazawa (Associate Professor, Division of Physics and Astronomy, Graduate School of Science, Kyoto University)
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Seminar
Fireworks in the cosmos: The Hidden Power of Nuclear Reactions
February 7 (Fri) at 14:00 - 15:15, 2025
Irin Sultana (Postdoctoral Researcher, Department of Physics, Central Michigan University, USA)
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Workshop
Pebbles in Planet Formation
February 10 (Mon) - 13 (Thu), 2025
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Workshop
iTHEMS Cosmology Forum 3 - (P)reheating the primordial Universe
March 4 (Tue) at 9:30 - 17:35, 2025
Kaloian Dimitrov Lozanov (Project Researcher, Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU), The University of Tokyo)
Seishi Enomoto (Postdoctoral Researcher, College of Engineering Science, Yokohama National University)
John T. Giblin (Professor, Department of Physics, Kenyon Collge, USA) -
Workshop
Third Workshop on Density Functional Theory: Fundamentals, Developments, and Applications (DFT2025)
March 25 (Tue) - 27 (Thu), 2025
Opportunities
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Seeking an Administrative Part-time Worker (W24268)
Deadline: Open until filled
Administrative Part-time Worker Ⅰ or Ⅱ, one position. iTHEMS is seeking a Administrative Part-time Worker to support common project operations, assist with administrative tasks within research teams, provide support for research activities, and help with the organization and management of meetings and events hosted or co-hosted by the project.
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Seeking a few Assistants (W24257)
Deadline: Open until filled
Assistants, a few positions. iTHEMS is seeking a few assistants to support the center's operations. Responsibilities include administrative tasks such as procurement, budget management, and personnel procedures, as well as preparing and organizing research meetings, seminars, and managing researchers' schedules.
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Seeking a few Postdoctoral Researchers or Research Scientists (W24214)
Deadline: Open until filled
Postdoctoral Researcher or Research Scientist, a few positions. iTHEMS is seeking Postdoctoral Researchers or Research Scientists in the field of theoretical physics.
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Seeking a few Research Scientists or Senior Research Scientists (W24208)
Deadline: Open until filled
Research Scientist or Senior Research Scientist, a few positions. iTHEMS is seeking young researchers with strong motivation to actively promote interdisciplinary research and demonstrate leadership.
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Seeking a few Research Scientists or Senior Research Scientists (W24193)
Deadline: Open until filled
Research Scientist or Senior Research Scientist, a few positions. iTHEMS is seeking Research Scientists or Senior Research Scientists to advance research in mathematics, including algebra, geometry, and analysis.
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Seeking a few Research Scientists or Senior Research Scientists (W24189)
Deadline: Open until filled
Research Scientist or Senior Research Scientist, a few positions. iTHEMS is seeking Research Scientists or Senior Research Scientists in the fields of theoretical biology, mathematical biology, computational biology, and biophysics.
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Seeking a few Research Scientists or Senior Research Scientists (W24168)
Deadline: Open until filled
Research Scientist or Senior Research Scientist, a few positions. iTHEMS is seeking applications for Research Scientists or Senior Research Scientists in the field of applied mathematics.
Latest News
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2025-01-10
Hot TopicFarewell message from Yantao Wu
Our colleague Yantao Wu will move on to a new career as a faculty member at Institute of Physics, Chinese Academy of Sciences as of January 10, 2024. We all will miss him and wish him the best of luck in his latest endeavor. Here is a message from Yantao Wu: I joined iTHEMS in June 2021 as a RIKEN-Berkeley fellow, and have stayed here for three years and a half now. iTHEMS is a precious rare place in the academic world, where there seems to be no responsibility, no one telling you what to do, and infinite space for travel; where there seems to be a curious mind on every subject and every question ought to be asked. The interdisciplinary nature of the group has forever left an imprint on me, and I will always remember the vivid biological facts and mathematical tricks that I have learned here. Entering as a condensed matter physicist and leaving as a condensed matter physicist, my heart will always have a spot for the particle theory which I have learned from here. It has been an unexpected, yet very pleasant mix. Sadly, it appears that every gathering ends somewhere, and I need to leave this warm and protective bubble to a new place, to really enter the grown world of independent research and start my own group. iTHEMS will always remain as a source of lasting encouragement. I will move to the Institute of Physics, Chinese Academy of Sciences in Beijing to start a faculty position. If you ever want to visit, please let me know you are from iTHEMS and I will make you a cup of tea (amidst taking you to the great wall and covering your travel costs.)
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2025-01-10
Press ReleaseDiscovery of Measurement-Induced Spectral Phase Transition in Quantum Systems
A collaborative research team, including Ryusuke Hamazaki (Senior Research Scientist, iTHEMS / RIKEN Hakubi Team Leader, Nonequilibrium Quantum Statistical Mechanics RIKEN Hakubi Research Team, RIKEN Cluster for Pioneering Research (CPR)), has discovered a spectral phase transition in quantum systems under measurement. This research is expected to bridge the gap between two seemingly distinct phenomena: the recently emerging field of “measurement-induced phase transitions in nonequilibrium quantum systems" and the long-studied "phase transitions in equilibrium quantum systems." By discovering the analogy between these transitions, this work paves the way for a deeper understanding of quantum many-body systems. Using a method known as Lyapunov analysis, the team demonstrated the existence of spectral phase transitions in quantum systems under measurement. Furthermore, they found that the critical point of these spectral phase transitions coincides with the critical point of entanglement transitions. For more details, please refer to the related link.
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2025-01-09
Paper of the WeekWeek 2, January 2025
Title: Imaginary Hamiltonian variational ansatz for combinatorial optimization problems Author: Xiaoyang Wang, Yahui Chai, Xu Feng, Yibin Guo, Karl Jansen, Cenk Tüysüz arXiv: http://arxiv.org/abs/2408.09083v2 Title: GRB Redshift Classifier to Follow-up High-Redshift GRBs Using Supervised Machine Learning Author: Maria Giovanna Dainotti, Shubham Bhardwaj, Christopher Cook, Joshua Ange, Nishan Lamichhane, Malgorzata Bogdan, Monnie McGee, Pavel Nadolsky, Milind Sarkar, Agnieszka Pollo, Shigehiro Nagataki arXiv: http://arxiv.org/abs/2408.08763v3 Title: Isosceles trapezoids of unit area with vertices in sets of infinite planar measure Author: Junnosuke Koizumi arXiv: http://arxiv.org/abs/2501.01914v1 Title: From planar to annular to toroidal bracket polynomials for pseudo knots and links Author: Ioannis Diamantis, Sofia Lambropoulou, Sonia Mahmoudi arXiv: http://arxiv.org/abs/2501.00736v1 Title: Monte Carlo simulation of the $SU(2)/\mathbb{Z}_2$ Yang--Mills theory Author: Motokazu Abe, Okuto Morikawa, Hiroshi Suzuki arXiv: http://arxiv.org/abs/2501.00286v1 Title: Deep learning for exploring hadron-hadron interactions Author: Lingxiao Wang arXiv: http://arxiv.org/abs/2501.00374v1