Featured News
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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Workshop Tomorrow
Pebbles in Planet Formation
February 10 (Mon) - 13 (Thu), 2025
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Seminar
Mathematical Studies on Human Cooperation
February 12 (Wed) at 15:00 - 17:00, 2025
Yohsuke Murase (Research Scientist, Discrete Event Simulation Research Team, RIKEN Center for Computational Science (R-CCS))
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Seminar
Application of genetics and genomics to breeding
February 13 (Thu) at 16:00 - 17:30, 2025
Jeffrey Fawcett (Chief Scientist, Regional Fish Institute, Ltd.)
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Seminar
Operator-algebraic approach to point processes
February 14 (Fri) at 15:00 - 17:00, 2025
Ryosuke Sato (JSPS Postdoctoral Research Fellow, Faculty of Science and Engineering, Chuo University)
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Colloquium
MACS 10th Anniversary Colloquium & 2024 MACS Achievement Report Meeting
February 19 (Wed) at 14:45 - 18:30, 2025
Hiroshi Kokubu (Executive Vice-President, Kyoto University)
Yoshiko Takahashi (Professor, Division of Biological Sciences, Graduate School of Science, Kyoto University) -
Seminar
The Topology, Geometry and Physics of non-Hausdorff manifolds
February 19 (Wed) at 15:00 - 17:00, 2025
O'Connell David (Ph.D. Student, Okinawa Institute of Science and Technology Graduate University (OIST))
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Seminar
How to define a Majorana fermion?
February 20 (Thu) at 13:00 - 14:30, 2025
Kazuo Fujikawa (Professor Emeritus, The University of Tokyo)
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Seminar
Exploring the evolutionary fate of a mutualistic community using automated microbial culture system
February 20 (Thu) at 16:00 - 17:00, 2025
Junya Sunagawa (Ph.D. Student, Graduate School of Life Science, Hokkaido University)
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Seminar
Ubiquity of geometric Brascamp--Lieb data
February 21 (Fri) at 15:00 - 17:00, 2025
Hiroshi Tuji (JSPS Research Fellow PD, Graduate School of Science and Engineering, Saitama University)
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Workshop
Asymptotics in astrophysics iTHEMS workshop
February 25 (Tue) - 28 (Fri), 2025
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Seminar
Genome and Sex Chromosome Analyses of Japanese Frogs Carrying Both XY and ZW Chromosomes Within the Same Species
February 27 (Thu) at 16:00 - 17:00, 2025
Yukako Katsura (Assistant Professor, Center for the Evolutionary Origins of Human Behavior, Kyoto University)
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Workshop
RIKEN-Nara Women's University Joint Diversity Promotion Workshop 2025
March 3 (Mon) - 4 (Tue), 2025
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Workshop
iTHEMS Cosmology Forum 3 - (P)reheating the primordial Universe
March 4 (Tue) - 5 (Wed), 2025
Seishi Enomoto (Postdoctoral Researcher, College of Engineering Science, Yokohama National University)
John T. Giblin (Professor, Department of Physics, Kenyon College, USA)
Kyohei Mukaida (Assistant Professor, Theory Center, High Energy Accelerator Research Organization (KEK)) -
Colloquium
Smart heuristics of a single-celled organism
March 7 (Fri) at 14:00 - 15:30, 2025
Toshiyuki Nakagaki (Professor, Research Institute for Electronic Science, Hokkaido University)
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Workshop
Third Workshop on Density Functional Theory: Fundamentals, Developments, and Applications (DFT2025)
March 25 (Tue) - 27 (Thu), 2025
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Seminar
Stability of nonsingular black holes
March 27 (Thu) at 15:00 - 16:30, 2025
Shinji Tsujikawa (Professor, Graduate School of Advanced Science and Engineering, Faculty of Science and Engineering, Waseda University)
Opportunities
Latest News
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2025-02-06
Paper of the WeekWeek 2, February 2025
Title: Investigating the Bouncing Barrier with Collision Simulations of Compressed Dust Aggregates Author: Haruto Oshiro, Misako Tatsuuma, Satoshi Okuzumi, Hidekazu Tanaka arXiv: http://arxiv.org/abs/2502.03107v1 Title: Renormalization-group approach to the Kohn-Luttinger superconductivity: Amplification of the pairing gap from $\ell^4$ to $\ell$ Author: Yuki Fujimoto arXiv: http://arxiv.org/abs/2502.01169v1 Title: $NJ/ψ$ and $Nη_c$ interactions from lattice QCD Author: Yan Lyu, Takumi Doi, Tetsuo Hatsuda, Takuya Sugiura arXiv: http://arxiv.org/abs/2502.00054v1 Title: Identification of finite circular metric spaces by magnitude and Riesz energy Author: Hiroki Kodama, Jun O'Hara arXiv: http://arxiv.org/abs/2408.06091v3 Title: Computing theta-dependent mass spectrum of the 2-flavor Schwinger model in the Hamiltonian formalism Author: Akira Matsumoto, Etsuko Itou, Yuya Tanizaki arXiv: http://arxiv.org/abs/2501.18960v2 Title: Novel Lattice Formulation of 2D Chiral Gauge Theory via Bosonization Author: Okuto Morikawa, Soma Onoda, Hiroshi Suzuki arXiv: http://arxiv.org/abs/2501.18949v1 Title: Biological invasion by the cycad-specific scale pest Aulacaspis yasumatsui (Diaspididae) into Cycas revoluta (Cycadaceae) populations on Amami-Oshima and Okinawa-jima, Japan Author: Benjamin E. Deloso, José Said Gutiérrez-Ortega, Jui-Tse Chang, Yasuko Ito-Inaba, Anders J. Lindström, L. Irene Terry, John Donaldson, William Tang, Ronald D. Cave, Jorge Antonio Gómez-Díaz, Vanessa M. Handley, M. Patrick Griffith, Thomas E. Marler Journal Reference: Plant Species Biology doi: https://doi.org/10.1111/1442-1984.12505 Title: Spacetime profile of electromagnetic fields in intermediate-energy heavy-ion collisions Author: Hidetoshi Taya arXiv: http://arxiv.org/abs/2501.18171v1
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2025-01-31
Seminar ReportQuantum Computation SG Seminar by Suguru Endo on January 28, 2025
In this 2-day lecture, Dr. Endo reviewed quantum error mitigation, which offers a practical approach to reducing errors in noisy intermediate-scale quantum (NISQ) devices without requiring the encoding of qubits. The first day started by discussing the fundamentals of noise modeling in quantum systems, and then we overviewed concrete examples of QEM techniques, including extrapolation, probabilistic error cancellation (PEC), virtual distillation, quantum subspace expansion, and Clifford data regression. After that, the lecturer presented advanced QEM methods, such as the stochastic PEC approach, which mitigates the effects of Lindblad terms in Lindblad master equations and the generalized quantum subspace expansion, which is a unified framework of QEM. In the second day, the lecturer introduced recent research topics including information-theoretic analysis of QEM, connections to non-Markovian dynamics, combination of QEM with quantum error correction toward the early fault-tolerant quantum computing era. The lecture attracted attendees with wide research backgrounds ranging from quantum information to condensed matter, nuclear, and particle physics. Reported by Yuta Sekino
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2025-01-30
Paper of the WeekWeek 5, January 2025
Title: $Λ$(1405) in the flavor SU(3) limit using a separable potential in the HAL QCD method Author: Kotaro Murakami, Sinya Aoki arXiv: http://arxiv.org/abs/2501.17423v1 Title: Multi-Messenger and Cosmological Constraints on Dark Matter through Two-Fluid Neutron Star Modeling Author: Ankit Kumar, Sudhakantha Girmohanta, Hajime Sotani arXiv: http://arxiv.org/abs/2501.16829v1 Title: Left-hand cut and the HAL QCD method Author: Sinya Aoki, Takumi Doi, Yan Lyu arXiv: http://arxiv.org/abs/2501.16804v1 Title: Reconstruction of QCD first-order phase transition from neutron star measurements Author: Ronghao Li, Sophia Han, Zidu Lin, Lingxiao Wang, Kai Zhou, Shuzhe Shi arXiv: http://arxiv.org/abs/2501.15810v1 Title: Synthesis of a semimetallic Weyl ferromagnet with point Fermi surface Author: Ilya Belopolski, Ryota Watanabe, Yuki Sato, Ryutaro Yoshimi, Minoru Kawamura, Soma Nagahama, Yilin Zhao, Sen Shao, Yuanjun Jin, Yoshihiro Kato, Yoshihiro Okamura, Xiao-Xiao Zhang, Yukako Fujishiro, Youtarou Takahashi, Max Hirschberger, Atsushi Tsukazaki, Kei S. Takahashi, Ching-Kai Chiu, Guoqing Chang, Masashi Kawasaki, Naoto Nagaosa, Yoshinori Tokura Journal Reference: Nature (2025) doi: https://doi.org/10.1038/s41586-024-08330-y Title: Grassmann Tensor Renormalization Group for two-flavor massive Schwinger model with a theta term Author: Hayato Kanno, Shinichiro Akiyama, Kotaro Murakami, Shinji Takeda arXiv: http://arxiv.org/abs/2501.14086v1 Title: Pair Correlation of Zeros of the Riemann Zeta Function I: Proportions of Simple Zeros and Critical Zeros Author: Siegfred Alan C. Baluyot, Daniel Alan Goldston, Ade Irma Suriajaya, Caroline L. Turnage-Butterbaugh arXiv: http://arxiv.org/abs/2501.14545v1
Upcoming Visitors
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Visiting
Paul Martens
Postdoctoral Fellow, Department of Physics, The Chinese University of Hong Kong, ChinaTerm: January 29 (Wed) - February 25 (Tue), 2025Visiting Place: RIKEN Wako Campus -
Gokcumen Omer
Professor, Department of Biological Sciences, University at Buffalo, USATerm: February 24 (Mon) - 25 (Tue), 2025Visiting Place: RIKEN Wako Campus -
Nobuo Iida
Postdoctoral Fellow, Department of Mathematics, School of Science, Institute of Science TokyoTerm: February 24 (Mon) - 28 (Fri), 2025Visiting Place: RIKEN Wako Campus -
Tomo Takahashi
Professor, Department of Physics, Saga UniversityTerm: March 3 (Mon) - 6 (Thu), 2025Visiting Place: RIKEN Wako Campus -
John T. Giblin
Professor, Department of Physics, Kenyon College, USATerm: March 4 (Tue) - 7 (Fri), 2025Visiting Place: RIKEN Wako Campus -
Gokcumen Omer
Professor, Department of Biological Sciences, University at Buffalo, USATerm: March 6 (Thu) - 7 (Fri), 2025Visiting Place: RIKEN Wako Campus