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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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Seminar Today
Open Effective Field Theories for primordial cosmology
October 18 (Fri) at 13:30 - 15:00, 2024
Thomas Colas (Postdoc, Department of Applied Mathematics and Theoretical Physics, University of Cambridge, UK)
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Seminar Today
Young's convolution inequality on locally compact groups
October 18 (Fri) at 15:00 - 17:00, 2024
Takashi Satomi (Special Postdoctoral Researcher, iTHEMS)
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Seminar
The hidden language of light: Polarization signals in cuttlefish courtship
October 24 (Thu) at 16:00 - 17:00, 2024
Arata Nakayama (Postdoctoral Fellow, Atmosphere and Ocean Research Institute, The University of Tokyo)
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Seminar
Asymmetries in Stripped Envelope Supernovae
October 25 (Fri) at 14:00 - 15:15, 2024
Thomas Maunder (Ph.D. Student, Department of Astronomy, Monash University, Australia)
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Workshop
Knitting Day
November 1 (Fri) at 10:00 - 16:00, 2024
Tomohiko Sano (Senior Assistant Professor, Department of Mechanical Engineering, Faculty of Science and Technology, Keio University)
Samuel Poincloux (Assistant Professor, Department of Physics and Mathematics, College of Science and Engineering, Aoyama Gakuin University)
Taiki Goto (Master's Student, Keio University)
Daisuke Shimamoto (Master's Student, The University of Tokyo)
Kotone Tajiri (Master's Student, Keio University)
Sonia Mahmoudi (Assistant Professor, Mathematical Science Group, Advanced Institute for Materials Research (AIMR), Tohoku University) -
Lecture
The 6th Special Online Class for Junior and Senior High School Students: Hot Science in Kobe Right Now
November 2 (Sat) at 10:30 - 14:30, 2024
Genshiro Sunagawa (Team Leader, Laboratory for Hibernation Biology, RIKEN Center for Biosystems Dynamics Research (BDR))
Kento Sato (Team Leader, High Performance Big Data Research Team, RIKEN Center for Computational Science (R-CCS))
Kyosuke Adachi (Research Scientist, iTHEMS)
Safiye Esra Sarper (Special Postdoctoral Researcher, Laboratory for Developmental Morphogeometry, RIKEN Center for Biosystems Dynamics Research (BDR)) -
Workshop
iTHEMS Science Outreach Workshop 2024
November 15 (Fri) - 17 (Sun), 2024
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Seminar
Solving inverse problem via latent variable optimization of diffusion models: An application to CT reconstruction
November 25 (Mon) at 14:00 - 15:00, 2024
Sho Ozaki (Assistant Professor, Graduate School of Science and Technology, Hirosaki University)
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Colloquium
The 27th MACS Colloquium
November 25 (Mon) at 14:45 - 18:00, 2024
Ryusuke Hamazaki (RIKEN Hakubi Team Leader, Nonequilibrium Quantum Statistical Mechanics RIKEN Hakubi Research Team, RIKEN Cluster for Pioneering Research (CPR))
Teruaki Enoto (Associate Professor, Department of Physics, Division of Physics and Astronomy, Graduate School of Science, Kyoto University) -
Seminar
Detecting single gravitons with quantum sensing
December 16 (Mon) at 14:00 - 15:30, 2024
Germain Tobar (PhD Fellow, Stockholm University, Norway)
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Workshop
Third Workshop on Density Functional Theory: Fundamentals, Developments, and Applications (DFT2025)
March 25 (Tue) - 27 (Thu), 2025
Opportunities
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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.
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Seeking a Team Leader (W24148)
Deadline: November 10, 2024
Team Leader: 1 position (Newly established team: AI for Science areas). iTHEMS is seeking a team leader who will promote 'AI for Science,' a field that accelerates research in the natural and social sciences through cutting-edge AI research and mathematical science, in collaboration with researchers both within and outside of iTHEMS.
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Seeking a Team Leader (W24147)
Deadline: November 10, 2024
Team Leader: 1 position (Newly established team: mathematical social sciences area). iTHEMS is seeking a team leader who will promote mathematical research to understand the dynamic structure of complex networks and pursue social stability and sustainability based on this understanding, in collaboration with researchers both within and outside of iTHEMS.
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Seeking a few Postdoctoral Researchers or Research Scientists (W24096)
Deadline: Open until filled
Postdoctoral Researchers or Research Scientists, a few positions. iTHEMS is seeking a few Postdoctoral Researchers or Research Scientists working in the Mathematical Genomics RIKEN ECL Research Unit(tentative name) with Dr. Leo Speidel.
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Seeking Research Scientists and concurrently appointed Research Administrative Support Staffs (W24060)
Deadline: Open until filled
Research Scientist, and concurrently Research Administrative Support Staff, about a few positions.
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Seeking a few Postdoctoral Researchers (W24022)
Deadline: Open until filled
Postdoctoral Researcher, a few positions. iTHEMS is seeking postdoctoral researcher(s) in ecology, evolutionary biology, and biodviersity.
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Seeking Postdoctoral Researcher, Research Scientist and Senior Research Scientist (W23143)
Deadline: Open until filled
Postdoctoral Researcher, Research Scientist or Senior Research Scientist, about 10 positions. This call is open to researchers in any field who wish to participate in RIKEN Quantum.
Latest News
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2024-10-17
Paper of the WeekWeek 3, October 2024
Title: Ab initio study on heavy-fermion behavior in LiV$_2$O$_4$: Role of Hund's coupling and stability Author: Steffen Backes, Yusuke Nomura, Ryotaro Arita, Hiroshi Shinaoka arXiv: http://arxiv.org/abs/2410.08515v1
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2024-10-17
Press ReleaseCreation of the Quantum Universe and Precise Calculation of the Wave Function of the Universe
In modern cosmology, the idea that the universe was created from nothing through quantum effects has been a topic of active research. However, a long-standing debate has persisted regarding which of two prominent hypotheses—the No-Boundary Hypothesis or the Tunneling Hypothesis—is correct. A research team, including Hiroki Matsui (Specially Appointed Researcher, Yukawa Institute for Theoretical Physics), Kazumasa Okabayashi (Specially Appointed Researcher, same institute), Masazumi Honda (Senior Research Scientist, RIKEN), and Takahiro Terada (Designated Assistant Professor, Nagoya University), has made significant progress in this debate by calculating the wave function of the universe from first principles, without the need for arbitrary assumptions about either hypothesis. Previous analyses left mathematical ambiguities unresolved, but this team eliminated those ambiguities using a method called "resurgence." Their calculations rigorously demonstrated, under certain assumptions, that the wave function of the universe aligns with predictions from the Tunneling Hypothesis, not the No-Boundary Hypothesis. This work represents a major step forward in resolving the longstanding debate between these two hypotheses. For more details, please refer to the Kyoto University press release via the related links.
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2024-10-16
Hot TopicRIKEN Quantum Workshop on “Quantum-Like Modeling in Cognitive & Social Sciences" on October 11, 2024
On Oct. 11 (Fri), RIKEN Quantum Workshop on “Quantum-Like Modeling in Cognitive & Social Sciences” was held at Room 359, Main Research Building, RIKEN (Wako). The workshop was hosted by RIKEN Quantum and had 30 participants from a variety of fields, including cognitive and social sciences as well as life sciences, mathematics, and physics. This was the first workshop at RIKEN to discuss “Quantum-Like Modeling” for various phenomena in cognitive and social sciences. “Quantum-Like Modeling” suggests that using quantum probability calculus and its applications could be useful to rationalize cognitive and social phenomena as open quantum systems and expand previous understandings, obtained through simple linear algebra, by applying quantum formalizations. After Atsushi Iriki, one of the organizers, explained the purpose of the workshop, there were four invited talks. Andrei Khrennikov gave a comprehensive talk on applications of the methodology and formalism of quantum theory outside of physics, in cognition, psychology, decision making, social and political sciences, economics and finance, genetics and evolutionary biology. Masanao Ozawa gave an introduction to his proposed quantum instrument theory, which unifies quantum measurement and quantum cognition through quantum simulation. Haruki Emori talked about applications of quantum computers to cognitive sciences based on the quantum instrument theory. Finally, Miho Fuyama introduced her empirical research on subjective experiences and superposition states of quantum probability theory in narrative reading. These invited talks were followed by a general discussion and networking mixer, which deepened understanding of “Quantum-Like Modeling” in cognitive and social sciences from various perspectives and promoted new networking among the participants.