ニュース
102件のニュース / 2026年
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2026-09-15
ホットトピック
Farewell message from Yuto Yamamoto
Our colleague, Yuto Yamamoto, will be joining the Department of Mathematics, School of Science, Institute of Science Tokyo as an Assistant Professor starting in October 2026. We will all miss him and wish him the best of luck in his new endeavor. Here is a message from Yuto: I am very grateful for the opportunity to have been a member of iTHEMS. During my time here, I enjoyed the stimulating research environment and many opportunities to interact with researchers from different fields. I would like to thank all the members and administrative staff of iTHEMS for their support and for making my time here productive and enjoyable. I have learned a lot from seminars, discussions, and informal conversations with colleagues. Although I am leaving iTHEMS, I hope to stay in touch and to have opportunities to meet and collaborate again in the future. I wish iTHEMS and all its members continued success. Thank you very much for everything.
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2026-09-15
ホットトピック
Farewell message from Kai Murai
Our colleague, Kai Murai, will be joining Tohoku University as an Assistant Professor starting in October 2026. We will all miss him and wish him the best of luck in his new endeavor. Here is a message from Kai: At the end of September, I will leave iTHEMS and move to Tohoku University as an assistant professor. I joined iTHEMS as an SPDR this April. Although my time here was short, it was a very stimulating experience. I especially appreciated the environment where researchers from various fields worked in the same place. It was interesting to be surrounded by research on topics quite different from my own, and I also enjoyed the opportunities to talk with researchers from other fields. I am very grateful to the iTHEMS members who talked with me, as well as to the assistants for all their support. I will come back to iTHEMS for workshops and other occasions, and I look forward to seeing many of you again.
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2026-09-15
ホットトピック
JST-ASPIRE Symposium Held in Palo Alto
On July 24, 2026, the JST-ASPIRE Symposium, “Strengthening Japan–U.S. Research Collaboration through International Talent Circulation,” was held at the Japan Innovation Campus in Palo Alto, California. Organized by the Japan Science and Technology Agency (JST), the symposium brought together representatives of the Japanese government, principal investigators of ASPIRE projects, early-career researchers conducting research in the United States, and U.S.-based researchers. The program focused on research activities supported by ASPIRE, the experiences of early-career researchers working abroad, and future opportunities for Japan–U.S. research collaboration. A panel discussion also addressed how international researcher mobility can contribute to strengthening research capabilities and building sustainable international networks. Four young researchers participating in the RIKEN–Berkeley Mathematical Quantum Science Initiative—Yuuka Kanakubo, Gabriele Di Ubaldo, Haruki Emori, and Shoto Aoki—gave a joint presentation. They introduced their respective research activities and shared experiences gained through conducting research in the United States, as well as their perspectives on future research and career development. Their diverse research areas, ranging from high-energy and nuclear physics to quantum gravity, quantum information, and lattice gauge theory, reflect the broad scope of the RIKEN–Berkeley collaboration. The symposium provided an opportunity to introduce the activities of the RIKEN–Berkeley Mathematical Quantum Science Initiative within the broader ASPIRE program and to consider the importance of sustained researcher exchange between Japan and the United States. Reported by Shuntaro Aoki
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2026-09-10
今週の論文Week 2, September 2026
Title: Magnitude and motivic zeta functions of matroids Author: Junnosuke Koizumi arXiv: http://arxiv.org/abs/2609.07977v1 Title: Asymptotics of Ground States for Helium-Like and Bosonic Atoms in a Two-Cluster Region Author: Yukimi Goto arXiv: http://arxiv.org/abs/2609.08257v1 Title: Quantum-Geometric Meissner Effect in Magnetized Color Superconductors Author: Kazuya Mameda, Noriyuki Sogabe arXiv: http://arxiv.org/abs/2609.07835v1 Title: Theoretical Review on Bulk Properties and Light/Strange Hadron Production in Heavy-Ion Collisions Author: Yuuka Kanakubo arXiv: http://arxiv.org/abs/2609.05815v1 Title: Global Fixed Point Potentials in the Abelian Higgs Model with $N$ flavors Author: Gergely Fejős, Shunsuke Yabunaka arXiv: http://arxiv.org/abs/2609.04938v1 Title: Excitation factors and exceptional points of Kerr-de Sitter quasinormal modes Author: Dario Rossi, Naritaka Oshita, Leonardo Gualtieri, Emanuele Berti arXiv: http://arxiv.org/abs/2609.03009v1 Title: Discretization-Aware Fine-Tuning for Quantum Machine Learning with Chemical Foundation Models Author: Shunji Matsuura, Sonika Johri arXiv: http://arxiv.org/abs/2609.03220v1 Title: Center-twisted Gribov spectra and the finite-volume Gaussian response in the refined Gribov--Zwanziger framework Author: Okuto Morikawa arXiv: http://arxiv.org/abs/2609.03525v1
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2026-09-08
ホットトピック
Masason Foundation Summer Program Visit to the RIKEN–Berkeley Center on August 11, 2026
Participants in the Masason Foundation’s summer program visited the RIKEN–Berkeley Center at the University of California, Berkeley, on August 11, 2026. The summer program provides young participants with opportunities to broaden their perspectives through visits to universities, research institutions, and other organizations, and through direct interactions with researchers and professionals. The visit began with a tour of the UC Berkeley Physics Department, including an introduction to its history and research environment. This was followed by short presentations by researchers, including Shoto Aoki, Yuka Kanakubo, Gabriele Di Ubaldo, and Akira Dohi, who introduced their research activities to the participants. In the latter part of the program, the participants visited several experimental laboratories at UC Berkeley. Through the presentations, discussions, and laboratory visits, they had an opportunity to learn about a broad range of research activities and to experience firsthand the environment in which cutting-edge research is carried out. The visit provided a valuable opportunity for the young participants to interact directly with researchers at RIKEN and UC Berkeley and to gain a broader perspective on scientific research and possible future career paths. Reported by Shuntaro Aoki
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2026-09-03
今週の論文Week 1, September 2026
Title: Dark Matter as the Z_2 Partner of the Standard Model Higgs Boson Author: Yasunori Nomura arXiv: http://arxiv.org/abs/2609.02505v1 Title: Symmetry-Reduced Variational Quantum Simulation of the $U(5)\rightarrow SU(3)$ Quantum Phase Transition in the Interacting Boson Model Author: Faisal Etminan arXiv: http://arxiv.org/abs/2609.00349v1 Title: Detecting Multiple Phase Transitions in Lattice Systems with Intrinsic Dimensions Author: Jie Mei, Tetsuo Hatsuda, Mei Huang, Lingxiao Wang arXiv: http://arxiv.org/abs/2608.29090v1 Title: Two Languages for the Same Resonance: From Nuclear Decay to Black-Hole Ringdown Author: Okuto Morikawa arXiv: http://arxiv.org/abs/2608.29806v1 Title: Quantum Federated Learning Based on Bures--Uhlmann Geometry for Heterogeneous Noisy Clients Author: Haruki Emori, Masaki Uchihara, Yuuki Tokunaga arXiv: http://arxiv.org/abs/2608.28379v1 Title: Local inequalities for $cD$ and $cE$ singularities Author: Chi-Kang Chang, Jheng-Jie Chen, Takuzo Okada arXiv: http://arxiv.org/abs/2608.28372v1 Title: Apéry-type approximations and irrationality measures for certain $q$-series Author: Junnosuke Koizumi, Anju Yokoi arXiv: http://arxiv.org/abs/2608.26918v1 Title: Efficient Quantum Simulations of Yang-Mills theory with Maximal-tree Gauge Author: Tianyin Li, Ying-Ying Li, Xiaoyang Wang, Hongxi Xing arXiv: http://arxiv.org/abs/2608.27267v1 Title: Krylov Break Times from an Inhomogeneous Lieb--Robinson Light Cone Author: Shunji Matsuura, Yoji Kawamura, Joseph Salfi, Satoshi Iso arXiv: http://arxiv.org/abs/2608.27399v1 Title: Low-Frequency Gravitational Bremsstrahlung and Memory in a Medium Author: Diego Blas, Silvia Gasparotto, Hitoshi Murayama, Jan Schütte-Engel, Jann Zosso arXiv: http://arxiv.org/abs/2608.24994v1
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2026-09-01
ホットトピック
From Vietnam to Korea: A Summer of Quantum Computing
Duc-Truyen Le, a graduate student at Saitama University, is currently affiliated with iTHEMS as an International Program Associate (IPA). This summer, he participated in a series of quantum computing activities in Vietnam and Korea. In Vietnam, his team received an Honorable Mention at an international quantum computing hackathon involving participants from across Southeast Asia. We asked Duc-Truyen to share his experience with the iTHEMS community: From July 9 to 31, I stayed in Vietnam, mainly to prepare for and participate in a major quantum computing event that brought together scientists, industry leaders, policymakers, and government representatives. The event aimed to strengthen collaboration and promote investment in quantum technologies across both the public and private sectors. The program consisted of a series of activities held over more than a week, including workshops, discussions, networking events, and competitions. One of the highlights was the International Hackathon on Quantum Computing for Social Good (QC4SG Vietnam 2026 / 2nd SEA Quantathon), which brought together participants from across Southeast Asia. The competition was highly selective, with more than 500 initial applications. Selected teams went through a training phase before the finalists were invited to Vietnam to present their projects. For more information about the competition, please see the related link below. Among more than 20 finalist teams, comprising around 100 participants, our team, QuanWatt, was honored to receive an Honorable Mention. It was a rewarding experience and a valuable opportunity to exchange ideas with participants from different backgrounds. Our project explored how quantum computing could contribute to the analysis of modern power systems, which are becoming increasingly complex with the growing integration of renewable energy sources and smart-grid technologies. Although considerable work remains before such approaches can be applied in practice, it was encouraging to see increasing interest from both academia and industry in practical applications of quantum computing. Following the program in Vietnam, I traveled to Korea, where I attended a course at the Institute for Basic Science (IBS) from August 1 to 8 on “Quantum Computing for Quantum Field Theory.” This provided another valuable opportunity to learn about the rapidly developing connections between quantum computing and fundamental physics. Overall, these experiences in Vietnam and Korea were both memorable and intellectually stimulating. I am very grateful for the opportunity to participate and for the continued support I have received from iTHEMS.
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2026-08-31
ホットトピック
The 3rd NCTS-iTHEMS Joint Workshop on Theoretical, Mathematical, and Computational Sciences on August 18, 2026
The 3rd NCTS-iTHEMS Joint Workshop on Theoretical, Mathematical, and Computational Sciences was held from August 18 to 21, 2026, at the NCTS Physics Lecture Hall in the Cosmology Hall of National Taiwan University (NTU), Taipei. This was the third workshop in the series jointly organized by Taiwan's National Center for Theoretical Sciences (NCTS) and RIKEN iTHEMS, following the first workshop hosted by NCTS in 2024 and the second hosted by RIKEN in 2025. This year's workshop carried special significance as the first major joint activity after the signing ceremony held at NTU on April 23, 2026, where iTHEMS and NCTS launched the joint research initiative "Mathematical Frontiers for Matter, Life, and the Universe." The initiative, signed by iTHEMS Director Satoshi Iso and NCTS Directors Pei-Ming Ho and Ming-Lun Hsieh, aims to foster outstanding early-career researchers and to promote researcher exchanges, international symposia, and collaborative research between the two institutions. Reflecting this spirit, the scope of the workshop expanded beyond previous editions to encompass theoretical physics, mathematics, and computational sciences. The four-day program featured 28 talks and 10 posters. Three plenary lectures were delivered by Tzu-Chieh Wei (Stony Brook University) on the stability of quantum many-body phases against time-dependent perturbations, Etera Livine (ENS Lyon) on spinfoam approaches to quantum gravity, and Tan Bui-Thanh (UT Austin) on model-constrained scientific machine learning for digital twins. Thirteen invited speakers from RIKEN iTHEMS and twelve from Taiwanese universities and Academia Sinica presented research spanning high-energy physics, gravity, condensed matter physics, quantum information and computing, geometry and topology, applied mathematics, machine learning, and scientific AI. In the poster session, ten presenters, mostly students and early-career researchers, introduced their work in three-minute flash talks followed by lively discussions over coffee. The directors of both institutions delivered the opening and closing remarks, and the iTHEMS and NCTS organizers held internal discussions on future joint activities during the workshop. The interdisciplinary atmosphere led to many cross-field conversations during the coffee breaks, the poster session, and the banquet, and several new contacts between researchers of the two institutions were established. We thank the NCTS staff for their excellent local organization and all speakers and participants for making the workshop a success. We look forward to continuing the series and to deepening the collaboration between NCTS and iTHEMS under the new initiative. Reported by Ching-Kai Chiu
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2026-08-27
今週の論文Week 5, August 2026
Title: Non-perturbative news from the conformal window Author: Álvaro Pastor-Gutiérrez arXiv: http://arxiv.org/abs/2608.23674v1 Title: Borell--Brascamp--Lieb inequality with finitely many output functions Author: Takashi Satomi arXiv: http://arxiv.org/abs/2608.23963v1 Title: Sexual conflict and sexual pleiotropy Author: Thomas J. Hitchcock, Andy Gardner, Tracey Chapman, Jennifer C. Perry Journal Reference: Proc. R. Soc. B (2026) 293 (2077): 20253103 . doi: https://doi.org/10.1098/rspb.2025.3103 Title: Hilbert space relation from dS to AdS through Reflection Positivity Author: Yu-ki Suzuki arXiv: http://arxiv.org/abs/2608.19948v1
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2026-08-25
プレスリリース
評判に基づいた協力を支える仕組みを新たに発見
理化学研究所数理創造研究センター（iTHEMS）の村瀬洋介チームディレクターを含む国際共同研究チームは、評判に基づく協力行動の進化を可能にする新たな仕組みを理論的に明らかにしました。 人間社会では、他者の評判をもとに協力するかどうかを判断する「間接互恵性」が、協力関係を支える重要な仕組みの一つと考えられています。一方、同じ人に対する評価が人によって異なる場合、社会の中で協力を維持することが難しくなることが、これまでの研究で課題となっていました。 本研究では、従来のように「その人が他者に協力したか」だけでなく、「その人が他者から協力されたか」についても評判に反映する「二重評判更新」という仕組みを導入しました。その結果、この単純な拡張によって人々の評価の食い違いが抑えられ、協力が大幅に維持されやすくなることを、数理解析とコンピュータシミュレーションによって明らかにしました。 本成果は、評判を通じて協力が生まれ、維持される仕組みへの理解を深めるとともに、同調、協力、排斥など、実社会における集団行動を理解する新たな手がかりとなることが期待されます。 研究成果は、2026年8月28日に国際学術誌 Proceedings of the National Academy of Sciences (PNAS) に掲載予定です。
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2026-08-25
受賞情報
平島敬也 基礎科学特別研究員が「第13回IRMAILサイエンスグラント」ハイレゾ賞を受賞
平島敬也 基礎科学特別研究員が、株式会社ストラテジックによる2026年度 第13回研究費助成制度「IRMAILサイエンスグラント」において、ハイレゾ賞を受賞しました。 採択された研究テーマは「AIサロゲートモデルを活用した高解像度天の川銀河シミュレーションの実現」です。AIと高性能GPUを活用し、一つ一つの星まで表現する高解像度の天の川銀河シミュレーションの実現を目指します。
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2026-08-20
今週の論文Week 4, August 2026
Title: A Rotor-Dressed Semiton State in a Monopole--Fermion Model Author: Yuta Hamada arXiv: http://arxiv.org/abs/2608.18345v1 Title: Anomaly-Induced Phenomena with Massive Fermions: Higher-Landau-Level Dominance from Spatially Modulated Electric Fields Author: Koichi Hattori, Kazuya Mameda, Takeru Uchiyama, Di-Lun Yang arXiv: http://arxiv.org/abs/2608.17611v1 Title: Matrix product operator representations for the local conserved quantities of the spin-$1/2$ XYZ chain Author: Kohei Fukai, Kyoichi Yamada arXiv: http://arxiv.org/abs/2601.09245v2 Title: Riesz--Laurent representation of black-hole scattering and sourced response at exceptional points Author: Okuto Morikawa, Shoya Ogawa, Takuya Hirose arXiv: http://arxiv.org/abs/2608.14752v1 Title: Deformation of scalar generalized bi-Hamiltonian structure Author: Zhe Wang arXiv: http://arxiv.org/abs/2608.15538v1 Title: Axion Isocurvature Perturbations Survive the Scaling Evolution of Axion Domain Walls Author: Naoya Kitajima, Junseok Lee, Kai Murai, Fuminobu Takahashi, Wen Yin arXiv: http://arxiv.org/abs/2608.13650v1 Title: Parent–offspring conflict over sex determination in non-Mendelian systems Author: Thomas J. Hitchcock, Robert B. Baird Journal Reference: Evolution, qpag098 (2026) doi: https://doi.org/10.1093/evolut/qpag098 Title: Non-perturbative quark production and transport in the evolving glasma: the WAGASHI event generator Author: Nicholas J. Benoit, Chiho Nonaka, Hidetoshi Taya arXiv: http://arxiv.org/abs/2608.13393v1
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2026-08-20
今週の注目人物
Self-introduction: Abdul Raafik Arattu Thodika
Hi, I work on molecular simulations of protein systems. I completed my Ph.D. at the University of Texas at Arlington in 2026. My research uses multiscale quantum mechanical/molecular mechanical (QM/MM) simulations to understand the thermodynamics and kinetics of chemical reactions in enzymes. A major part of my work involves integrating machine learning with these simulations to make them faster and more accurate.
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2026-08-17
ホットトピック
Farewell message from Sungsik Kong
Our colleague, Sungsik Kong, will be joining Sejong University in South Korea as a tenure-track Assistant Professor in September 2026. We will all miss him and wish him every success in this exciting new chapter. Here is a message from Sungsik: I joined iTHEMS in August 2025, and over the past year I have had the privilege of working in an exceptional research environment. Starting in September 2026, I will be joining Sejong University in South Korea as a tenure-track Assistant Professor. While I am excited about this move, I am also sad to be leaving my position as a Research Scientist at iTHEMS. My time at RIKEN has been both challenging and incredibly rewarding. I am deeply grateful to RIKEN and iTHEMS for giving me the opportunity to pursue the scientific questions I am passionate about. I will miss iTHEMS' collaborative atmosphere. I have had the chance to learn from researchers across many different fields, many that I would never have had the opportunity to explore otherwise. Those seminars, colloquiums, and conversations have broadened my perspective, sparked new ideas, and made my time here truly valuable and memorable. If you ever visit Seoul, please don't hesitate to get in touch. Thank you all so much. It has been a real pleasure.
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2026-08-13
今週の論文Week 3, August 2026
Title: Sectoral inter-dependencies drive the loss of structural balance in signed financial networks Author: Kartik Dahake, Abhijit Chakraborty arXiv: http://arxiv.org/abs/2608.12023v1 Title: Imprints of core/cusp dark matter distributions on black hole signatures in galaxies Author: Hassan Hassanabadi, Che-Yu Chen, Soroush Zare, Volker Perlick arXiv: http://arxiv.org/abs/2608.11430v1 Title: Black hole spectroscopy: from theory to experiment Author: Emanuele Berti, Vitor Cardoso, Gregorio Carullo, Jahed Abedi, Niayesh Afshordi, Simone Albanesi, Vishal Baibhav, Swetha Bhagwat, José Luis Blázquez-Salcedo, Béatrice Bonga, Bruno Bucciotti, Giada Caneva Santoro, Pablo A. Cano, Collin Capano, Mark Ho-Yeuk Cheung, Cecilia Chirenti, Gregory B. Cook, Adrian Ka-Wai Chung, Marina De Amicis, Kyriakos Destounis, Oscar J. C. Dias, Walter Del Pozzo, Francisco Duque, Will M. Farr, Eliot Finch, Nicola Franchini, Kwinten Fransen, Vasco Gennari, Stephen R. Green, Scott A. Hughes, Maximiliano Isi, Xisco Jimenez Forteza, Gaurav Khanna, Fech Scen Khoo, Masashi Kimura, Badri Krishnan, Adrien Kuntz, Macarena Lagos, Rico K. L. Lo, Lionel London, Sizheng Ma, Simon Maenaut, Lorena Magaña Zertuche, Elisa Maggio, Andrea Maselli, Keefe Mitman, Hayato Motohashi, Naritaka Oshita, Costantino Pacilio, Paolo Pani, Rodrigo Panosso Macedo, Chantal Pitte, Lorenzo Pompili, Jaime Redondo-Yuste, Maurício Richartz, Antonio Riotto, Jorge E. Santos, Bangalore Sathyaprakash, Laura Sberna, Hector O. Silva, Leo C. Stein, Alexandre Toubiana, Sebastian H. Völkel, Julian Westerweck, Huan Yang, Sophia Yi, Nicolas Yunes, Hengrui Zhu Journal Reference: Class. Quantum Grav. 43 (2026) 123001 doi: https://doi.org/10.1088/1361-6382/ae59e2 arXiv: http://arxiv.org/abs/2505.23895v3 Title: A MUSE View of the Optical Torus within the Supernova Remnant 1E 0102.2-7219 Author: Janette Suherli, Samar Safi-Harb, Ivo R. Seitenzahl, Frédéric P. A. Vogt, Parviz Ghavamian, Ralph Sutherland, Chuan-Jui Li, Ashley J. Ruiter, Gilles Ferrand doi: https://doi.org/10.3847/1538-4357/ae7d1e arXiv: http://arxiv.org/abs/2606.17563v1 Title: Revisiting the Supernova Engines in the 3C 397 and W49B Supernova Remnants Author: Cole Treyturik, Chelsea Braun, Samar Safi-Harb, Christopher L. Fryer, Gilles Ferrand arXiv: http://arxiv.org/abs/2512.01176v1 Title: A Systematic Study of Type Ia Supernova Remnants: Using Nucleosynthesis to Probe their Supernova Progenitors Author: Cole Treyturik, Samar Safi-Harb, Gilles Ferrand arXiv: http://arxiv.org/abs/2608.07778v1 Title: Magnetic Catalysis and Fermion Mass Generation in de Sitter Spacetime Author: Kohei Fujikura, Toshifumi Noumi, Shintetsu Yamazaki arXiv: http://arxiv.org/abs/2608.07270v1 Title: Involutive Khovanov homology and equivariant knots II Author: Taketo Sano arXiv: http://arxiv.org/abs/2608.07114v1
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2026-08-07
今週の注目論文
Using chaos and symmetry to bootstrap quantum gravitational wormholes
An international research collaboration between Gabriele Di Ubaldo (RIKEN-Berkeley Center at UC Berkeley and RIKEN iTHEMS), Jan Boruch (University of California, Berkeley, US), Felix M. Haehl (University of Southampton, UK), Eric Perlmutter (Université Paris-Saclay and Institut des Hautes Études Scientifiques, France), and Moshe Rozali (University of British Columbia, Canada) published the new study in Physical Review Letters. Random matrix theory provides a universal description of chaos in quantum systems, capturing statistical patterns among energy levels without requiring knowledge of microscopic details. The new challenge addressed is its extension to 2D Conformal Field Theories and their holographically dual 3D quantum gravity via the AdS₃/CFT₂ correspondence. In the AdS₃/CFT₂ correspondence, quantum gravity in a three-dimensional negatively curved spacetime is encoded in a two-dimensional conformal field theory on its boundary. The key difference is modular invariance, a symmetry stating that a theory on a 2D torus is invariant under modular transformations, which imposes stringent constraints and a rigid mathematical structure, seemingly incompatible with quantum chaos and random matrix theory. Building on the 2023 work of Di Ubaldo and Perlmutter, “AdS₃/RMT₂ duality”, the researchers developed a general, nonperturbative framework called RMT₂ that uplifts the correlations of any random matrix model into fully modular-invariant quantities. The team then used RMT₂ to predict quantum amplitudes for 3D wormholes with multiple torus-shaped boundaries. A wormhole is a tunnel-like geometric connection between otherwise separate regions or boundaries of spacetime. While it is not a shortcut for interstellar travel as in sci-fi movies, it encodes deeply quantum information about gravity and black holes. For the three-boundary wormhole, the team also performed a gravity calculation that agrees with the RMT₂ prediction. By turning the earlier AdS₃/RMT₂ proposal into a general framework, the study advances a research direction that Gabriele helped pioneer and provides a new tool for probing black-hole microstates and, in the near future, solving AdS₃ quantum gravity. For further details, please see the article in Physical Review Letters.
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2026-08-07
受賞情報
Riccardo Muolo Awarded Third Place at Falling Walls Lab Tokyo 2026
Riccardo Muolo awarded 3rd Place at Falling Walls Lab Tokyo, Japan Riccardo Muolo (Special Postdoctoral Researcher, Division of Fundamental Mathematical Science, iTHEMS) took part in the Falling Walls Lab Tokyo, Japan, held on 28 July 2026 at Shibuya Sakura Stage, and was awarded 3rd Place by the jury. The Falling Walls Lab is an international pitch and science-communication competition hosted by the Falling Walls Foundation, a Berlin-based non-profit founded in 2009 on the twentieth anniversary of the fall of the Berlin Wall. The Foundation channels the spirit of that night to ask a recurring question — which are the next walls to fall in science and society — and works to make breakthrough ideas accessible across borders and disciplines. Open to students and early-career professionals of all disciplines and nationalities, the Lab invites participants to pitch their research, business model, or innovative idea in just three minutes, in front of their peers and a jury from academia and business. Academic institutions around the world are invited to host their own Falling Walls Lab and send their winners to the Falling Walls Lab Finale in Berlin, where the Finalists compete for the title of Breakthrough Winner in the Emerging Talents category and the chance to pitch again on the main stage of the Falling Walls Science Summit. This year’s Tokyo edition was organized by EURAXESS Japan, the German Centre for Research and Innovation (DWIH) Tokyo, and Tobitate! Japan. Riccardo’s research covers nonlinear dynamics on networks and higher-order structures, synchronization, Turing pattern formation, and the control of dynamical systems — exactly the kind of cross-disciplinary work the Falling Walls Lab is designed to showcase. Distilling it into a compelling three-minute pitch and earning recognition among a strong international field of participants is a fine achievement. Congratulations, Riccardo!
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2026-08-06
プレスリリース
原子検出回数の異常ゆらぎと普遍性の発見
大阪公立大学 大学院理学研究科の 山本 和樹 講師と、理化学研究所 開拓研究所の 濱崎 立資 理研白眉研究チームリーダー（理化学研究所 数理創造研究センター 上級研究員）は、多数の原子からなる量子多体系を連続的に測定した際に、原子の検出回数のゆらぎが、測定の強さによって大きく変化することを理論的に明らかにしました。 測定が弱い場合には、原子の検出回数は標準的なゆらぎを示す一方で、測定が強い場合には、通常よりも大きな「異常ゆらぎ」が現れることを発見しました。 詳細は大阪公立大学のホームぺ―ジをご覧ください。
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2026-08-06
今週の論文Week 2, August 2026
Title: Machine-Learning Search for Lax Connections Author: Osamu Fukushima, Tomohiro Shigemura, Ryosuke Suda, Norihiro Tanahashi, Kentaroh Yoshida arXiv: http://arxiv.org/abs/2608.05146v1 Title: Dualizable Additive Categories Author: Ishan Levy, Jiacheng Liang, Vladimir Sosnilo arXiv: http://arxiv.org/abs/2608.04898v1 Title: Primordial Correlators from a Kaluza-Klein Graviton Continuum Author: Shuntaro Aoki arXiv: http://arxiv.org/abs/2608.01762v1 Title: The $g$-mode frequencies in cold neutron stars and nuclear saturation parameters Author: Hajime Sotani, Hajime Togashi arXiv: http://arxiv.org/abs/2608.02463v1 Title: Excitation region of Kerr black hole quasinormal modes from Stokes geometry Author: Naritaka Oshita arXiv: http://arxiv.org/abs/2607.28930v1 Title: Cooling of Hybrid Stars with a 2SC+$
- $ Phase Author: Tsuneo Noda, Akira Dohi, Nobutoshi Yasutake, Huan Chen, Toshiki Maruyama, Toshitaka Tatsumi arXiv: http://arxiv.org/abs/2606.31389v2
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2026-07-30
今週の論文Week 5, July 2026
Title: $\mathrm{SL}(2,\mathbb{Z})$ Theta Subgroup Structure of Maxwell theory in the Lattice Villain Hamiltonian Formulation Author: Shoto Aoki, Yoshio Kikukawa, Toshinari Takemoto arXiv: http://arxiv.org/abs/2607.25332v1 Title: A Path Integral Model of Cognition Author: Haruki Emori, Kazunori Kondo, Atsushi Iriki, Andrei Khrennikov arXiv: http://arxiv.org/abs/2607.24807v1 Title: Universality of dual mass-scaled fundamental modes in two-fluid neutron stars with mirror dark matter Author: Hajime Sotani, Ankit Kumar arXiv: http://arxiv.org/abs/2607.27005v1 Title: Expected number density of critical points of smooth Gaussian random fields in arbitrary dimensions Author: Satoshi Kuriki, Takahiko Matsubara, Satoshi Iso arXiv: http://arxiv.org/abs/2607.23903v1 Title: Page transition for the complexity of an evaporating black hole Author: Violet Concepcion, Yasunori Nomura, Kyle Ritchie, Samuel Weiss arXiv: http://arxiv.org/abs/2607.21734v1 Title: Continuous solutions of the complex Kac--Bernstein functional equation on the integers and the real numbers Author: Takashi Satomi arXiv: http://arxiv.org/abs/2607.24033v1 Title: On the Nucleon Effective Mass in Neutron Stars Cooling Author: Yuuki Sugiyama, Akira Dohi arXiv: http://arxiv.org/abs/2607.23253v1 Title: A lower bound on primordial power spectrum from halo substructure Author: Shin'ichiro Ando, Nagisa Hiroshima, Koji Ishiwata, Tomo Takahashi arXiv: http://arxiv.org/abs/2607.20884v1 Title: Stochastic Quantization as Optimal Control Author: Lingxiao Wang arXiv: http://arxiv.org/abs/2607.21436v1 Title: Unitary $k$-designs without Hamiltonian quenches Author: Pratik Nandy arXiv: http://arxiv.org/abs/2607.20640v1
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2026-07-29
ホットトピック
2026 iTHEMS Visit by the National Sun Yat-sen University, Taiwan
On June 25, a group of 3 professors and 13 students from National Sun Yat-sen University, Taiwan, visited RIKEN . The purpose of the visit was to immerse the students in RIKEN’s multidisciplinary research environment and introduce them to stateoftheart scientific methodologies. It also aimed to inspire their future research careers while exploring opportunities for academic exchange and longterm collaboration between both institutions. First, the group visited RIKEN Nishina Center for Accelerator-Based Science, hosted by Dr Claudio Santonastaso & Dr Seiya Sakai. Next visit was RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS), hosted by Dr. Gen Kurosawa. Last visit was RIKEN Center for Quantum Computing, hosted by Dr. Franco Nori. Gen Kurosawa, Senior Research Scientist, introduced iTHEMS’s interdisciplinary research environment and explained how mathematical methods from physics can be applied to important questions in biological clocks, leading to testable predictions that are verified experimentally.
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2026-07-24
ホットトピック
Farewell message from Puttarak Jai-akson
Our colleague, Puttarak Jai-akson, will be joining the Graduate School of Science, Kyoto University, as a Program-Specific Researcher, starting in August 2026. We will all miss him and wish him every success in this exciting new chapter. Here is a message from Puttarak: I would like to share that I will be leaving my position as a Postdoctoral Researcher at iTHEMS. I joined iTHEMS in November 2022, and after nearly four wonderful years, I will be moving to a new position as a Researcher at Kyoto University, starting in August 2026. During my time at iTHEMS, I greatly enjoyed the open, friendly, and interdisciplinary research environment. The opportunity to interact with researchers from diverse fields has broadened my perspective, inspired many new ideas, and significantly enriched my research. I am deeply grateful to all the members of iTHEMS for their support, encouragement, and the many enjoyable discussions we have shared. I would also like to express my heartfelt thanks to our wonderful iTHEMS Assistants, whose kindness, professionalism, and constant support made my time at iTHEMS all the more enjoyable. Although I am leaving my full-time position, I am pleased to continue my affiliation with iTHEMS as a Visiting Scientist. I sincerely hope to continue our discussions and collaborations in the future. If you happen to visit Kyoto University, please don't hesitate to let me know. I would be very happy to catch up and continue our conversations. Thank you all very much for everything. It has been a privilege to be part of iTHEMS, and I wish everyone continued success.
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2026-07-23
今週の論文Week 4, July 2026
Title: Interacting Dark Energy and Dark Matter in O(3) No-Scale Gravity Author: Lincoln da S. Pereira, Muzi Hong, Elisa G. M. Ferreira, Tsutomu T. Yanagida arXiv: http://arxiv.org/abs/2607.20320v1 Title: Gravitational waves from self-resonance during reheating with a quantum-corrected inflaton potential Author: Tomoya Inada, Noel Jonathan Jobu, Kenji Nishiwaki, Toshifumi Noumi, Naoki Yamatsu arXiv: http://arxiv.org/abs/2607.18381v1
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2026-07-16
今週の論文Week 3, July 2026
Title: Isometries between C$^*$-algebras with finite corank Author: Michiya Mori arXiv: http://arxiv.org/abs/2607.13367v1 Title: Strong-to-Weak Spontaneous Symmetry Breaking from Wormholes in Holography Author: Taishi Kawamoto, Kenya Tasuki, Masahito Yamazaki arXiv: http://arxiv.org/abs/2607.12022v1 Title: Evading Cosmological Strong Coupling in Non-minimally Coupled Vector Gravity Author: Antonio De Felice, Seishi Enomoto, Nagisa Hiroshima, Atsushi Naruko arXiv: http://arxiv.org/abs/2607.11125v1 Title: Magnitude homology of tope graphs Author: Junnosuke Koizumi arXiv: http://arxiv.org/abs/2607.11863v1 Title: Catalog of Altermagnetism in Magnetic Wallpaper/Space Groups and Nonsymmorphic Altermagnets Author: Congcong Le, Fan Cui, Iao-Fai Io, Moritz Hirschmann, Xianxin Wu, Ching-Kai Chiu arXiv: http://arxiv.org/abs/2607.10857v1 Title: Quantum Logic as the Logic of Contexts Author: Haruki Emori, Atsushi Iriki, Andrei Khrennikov, Kazunori Kondo arXiv: http://arxiv.org/abs/2607.09032v1 Title: Solving models with generalized free fermions I: Algebras and eigenstates Author: Kohei Fukai, Balázs Pozsgay, István Vona arXiv: http://arxiv.org/abs/2602.03431v1 Title: A free fermions in disguise model with claws Author: Kohei Fukai, István Vona, Balázs Pozsgay Journal Reference: SciPost Phys. 21, 011 (2026) doi: https://doi.org/10.21468/SciPostPhys.21.1.011 arXiv: http://arxiv.org/abs/2508.05789v2 Title: Diffusion Models for Sampling Near Criticality in Lattice Field Theories Author: Yang-yang Tan, Gert Aarts, Diaa E. Habibi, Biagio Lucini, Lingxiao Wang arXiv: http://arxiv.org/abs/2607.08505v1 Title: Nuclear Many-Body Systems as Benchmarks for Quantum Computing Author: Sota Yoshida, Alessandro Baroni, Takayuki Miyagi, Ermal Rrapaj arXiv: http://arxiv.org/abs/2607.08047v1
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2026-07-16
ホットトピック
2026 iTHEMS Visit by the University of California San Diego Global Seminar Program
On July 8, Dr. Stanley Lo, Teaching Professor in the Department of Cell and Developmental Biology at the School of Biological Sciences, UCSD, visited iTHEMS together with 24 undergraduate students. The purpose of the visit was to learn about iTHEMS and its research activities while supporting the students’ learning about human diversity and the relationship between science and society. Thomas Hitchcock, Research Scientist at iTHEMS, hosted the lecture. He introduced his academic and professional background and presented his current research on evolution, ecology, and genetics.
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2026-07-09
今週の論文Week 2, July 2026
Title: Strong Evidence for Three-$α$ Clustering in the Ground State of $^{12}\mathrm{C}$ Author: Kazuki Yoshida, Masaaki Kimura arXiv: http://arxiv.org/abs/2606.31437v1 Title: 6d Supergravity Blocks Author: Yuta Hamada, Seongmin Jeon, Hee-Cheol Kim arXiv: http://arxiv.org/abs/2607.05496v1 Title: Equation of state of QCD(-like) theory using Lattice Monte Carlo simulations Author: Etsuko Itou arXiv: http://arxiv.org/abs/2607.04624v1 Title: Quiver BPS Indices from Crystal Profiles Author: Jiakang Bao, Masahito Yamazaki arXiv: http://arxiv.org/abs/2607.03617v1 Title: Lattice study of primordial black hole formation in bumpy axion inflation Author: Masahiro Kawasaki, Kai Murai, Shunsuke Tsuchida arXiv: http://arxiv.org/abs/2607.01780v1
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2026-07-02
今週の論文Week 1, July 2026
Title: Three-Dimensional Simulations of Type Ia Supernova Remnants I: Effects of a Main-Sequence Companion Star Author: Jingxiao Luo, Gilles Ferrand, Zhengwei Liu, Xuefei Chen, Zhanwen Han Journal Reference: ApJ, 1005, 117 (2026) doi: https://doi.org/10.3847/1538-4357/ae6ce6 arXiv: http://arxiv.org/abs/2607.00354v1 Title: Rethinking quantum information in gravity and fields Author: Kanato Goto, Yuta Hamada, Kohtaro Kato, Takato Mori, Yoshifumi Nakata, Masataka Watanabe, Hayata Yamasaki, Masahito Yamazaki, Takuya Yoda arXiv: http://arxiv.org/abs/2606.30853v1 Title: Analytic index theory and spectral flow in real Hilbert $C^*$-modules Author: Chris Bourne, Alan L. Carey, Koen van den Dungen, Adam Rennie arXiv: http://arxiv.org/abs/2606.31322v1 Title: FRG analysis of dense two-color QCD within the linear sigma model Author: Gergely Fejős, Daiki Suenaga arXiv: http://arxiv.org/abs/2606.31040v1 Title: Nonequilibrium Andreev transport at the QGP-2SC interface Author: Tingyu Zhang, Honoka Hoshino, Hiroyuki Tajima, Motoi Tachibana, Mariusz Sadzikowski arXiv: http://arxiv.org/abs/2606.30521v1 Title: Characterisation of reactive Nash equilibria in repeated additive games Author: Franziska Lesigang, Christian Hilbe, Nikoleta E. Glynatsi arXiv: http://arxiv.org/abs/2606.27653v1 Title: Simultaneous Estimation of Partial-Transpose Moments with Active Memory Independent of the Moment Order Author: Junxiang Huang, Xiaoyang Wang, Xiao Yuan, Yukun Zhang arXiv: http://arxiv.org/abs/2606.14204v2
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2026-06-25
今週の論文Week 4, June 2026
Title: Time-dependent weighted directed networks of cryptocurrency interaction from high-frequency returns Author: Shubhangam Shukla, Mahesh Peyyala, Abhijit Chakraborty arXiv: http://arxiv.org/abs/2606.25466v1 Title: Time-reversal symmetric topological superconductivity in Machida-Shibata lattices Author: Ioannis Ioannidis, Ching-Kai Chiu, Thore Posske arXiv: http://arxiv.org/abs/2504.08674v2 Title: Neutrinoless double $β$ decay and leptogenesis in seesaw model Author: Kazuo Fujikawa arXiv: http://arxiv.org/abs/2606.24109v1 Title: Conformal blocks, parenthesized braid operad, and $c=1/2$ Virasoro vertex operator algebra Author: Yuto Moriwaki arXiv: http://arxiv.org/abs/2606.23076v1 Title: Microscopic mechanism of the Fayans pairing for the enhancement of charge radii Author: Tomoya Naito, Gianluca Colò, Xavier Roca-Maza, Hiroyuki Sagawa, Enrico Vigezzi arXiv: http://arxiv.org/abs/2606.21491v1 Title: Mechanistic mathematical model of the in vitro infection dynamics of Bunyamwera and Batai viruses including MOI-dependent shortening of the eclipse phase Author: Bevelynn Whaler, Eleanor Todd, Amelia B. Shaw, John N. Barr, Catherine A. A. Beauchemin, Grant Lythe, Carmen Molina-Paris, Martin Lopez-Garcia arXiv: http://arxiv.org/abs/2606.21481v1 Title: Quantum Simulation of Generalized Parton Distributions in the Schwinger Model Author: Tianyin Li, Hongxi Xing arXiv: http://arxiv.org/abs/2606.22602v1 Title: Macroscopic Black-Hole Remnants in a Nonlocal Field Theory: Towards Hawking Radiation in SFT Author: Feng-Yin Cheng, Pei-Ming Ho, Wei-Hsiang Shao arXiv: http://arxiv.org/abs/2606.20314v1
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2026-06-24
プレスリリース
自然法則に現れる「自由に選べる数」の由来に迫る －量子重力における自由パラメータの謎に新たな手掛かり－
楠亀 裕哉 iTHEMS客員研究員(本務: 九州大学 高等研究院 准教授）を含む国際共同研究グループは、2つの共形場理論を「界面」でつなぐ状況を解析しました。その結果、界面をわずかに動かしたときの応答を適切に取り出すと、2つの理論の違いを生む局所的な演算子が得られることを示し、それを具体的に構成する方法を与えました。 今回の成果は、「量子重力には外から自由に選べる連続パラメータが存在しない」という予想を裏付けるものとなっており、量子重力の根本問題の理解につながると期待されます。 詳細は九州大学のプレスリリースをご覧ください。
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2026-06-18
今週の論文Week 3, June 2026
Title: Holographic Schwinger-Keldysh effective action for heavy quarks in confinement and deconfinement phases Author: Shin Nakamura, Daichi Takeda arXiv: http://arxiv.org/abs/2606.17919v1 Title: A Lindbladian for holographic Brownian motion Author: Daichi Takeda arXiv: http://arxiv.org/abs/2606.17909v1 Title: Structural Oscillatority Criterion of Boolean Networks Author: Hiroki Kodama arXiv: http://arxiv.org/abs/2606.15852v1 Title: Non-Archimedean balanced metrics and their application to totally degenerate abelian varieties Author: Keita Goto arXiv: http://arxiv.org/abs/2606.15758v1 Title: Hadronic tensor in lattice gauge theories by quantum computing Author: Dairui Zou, Tianyin Li, Jian Liang, Enke Wang, Hongxi Xing arXiv: http://arxiv.org/abs/2606.17003v1 Title: Hadron spectra of finite-density QC$_2$D Author: Kei Iida, Etsuko Itou, Kotaro Murakami, Daiki Suenaga arXiv: http://arxiv.org/abs/2606.13974v1 Title: Invariants of Sequential Circuits and Generalized Non-Abelian Statistics Author: Shintaro Sato, Yoshimasa Hidaka, Ryohei Kobayashi arXiv: http://arxiv.org/abs/2606.11527v1 Title: Numerical Hints for Dyon Condensation at $θ=2π$ via Wilson-'t Hooft Loops in $SU(2)$ Yang-Mills Theory Author: Hiromasa Watanabe, Issaku Kanamori, Okuto Morikawa, Yuki Nagai, Yuya Tanizaki, Akio Tomiya arXiv: http://arxiv.org/abs/2606.13428v1 Title: A model of local and global reciprocity Author: Mari Kawakatsu, Yohsuke Murase, Taylor A. Kessinger, Joshua B. Plotkin arXiv: http://arxiv.org/abs/2606.13678v2
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2026-06-11
今週の論文Week 2, June 2026
Title: Collective neutrino oscillations: Many-body non-forward effects and non-classicality Author: Julien Froustey, Ermal Rrapaj, Yuhao Liu, Gushu Li, Costin Iancu, Vincenzo Cirigliano arXiv: http://arxiv.org/abs/2606.12404v1 Title: Searches for GeV-Scale ALPs at RHIC Author: Kaori Fuyuto, Claudio Andrea Manzari, Hitoshi Murayama arXiv: http://arxiv.org/abs/2606.07739v1 Title: Post-Merger Gravitational-Wave Uncertainties of Binary Neutron Stars under Multi-Messenger EOS Constraints Author: Yong-Jia Huang, Luca Baiotti arXiv: http://arxiv.org/abs/2606.08522v2 Title: Generative Criticality in Large Language Model Temperature Scaling Author: Huajian Ruan, Jinyang Li, Xingyu Guo, Lingxiao Wang arXiv: http://arxiv.org/abs/2606.06238v1 Title: Magnetic Symmetries and the Structure of Correlation Functions in Quantum Field Theory Author: Masaru Hongo, Kentaro Nishimura arXiv: http://arxiv.org/abs/2606.03082v1 Title: Understanding deconfined quantum critical points from crystalline categorical Landau paradigm Author: Hiromi Ebisu, Bo Han, Weiguang Cao arXiv: http://arxiv.org/abs/2606.05856v1 Title: Symmetry-based selection rules for higher-order interactions in coupled oscillators Author: Iván Léon, Riccardo Muolo, Yuanzhao Zhang, Maxime Lucas arXiv: http://arxiv.org/abs/2606.04904v1
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2026-06-11
ホットトピック
The First RIKEN Quantum International Workshop on Frontiers of Quantum Computing Applications and Quantum-HPC Integration on May 25-26, 2026
The First RIKEN Quantum International Workshop on Frontiers of Quantum Computing Applications and Quantum–HPC Integration was held from May 25 to 26 at the Large Conference Room on the 2nd floor of the Administrative Headquarters, RIKEN Wako Campus. The workshop featured an entirely invited program, consisting of 13 plenary presentations (40 minutes each) and 9 highlight presentations (20 minutes each). The presentations covered a broad range of fields—including quantum chemistry, life sciences, condensed matter physics, atomic physics, and high-energy physics—with a primary focus on the theme of quantum–HPC hybrid integration. With more than 130 registered participants, each presentation was followed by lively and engaging discussions. Furthermore, the networking reception held on the evening of the first day was well-attended, fostering active interaction and collaboration among researchers from universities, national research institutes, and private industries. This workshop is expected to drive further advancements in quantum computing through quantum–HPC hybrid integration. Reported by Shinichiro Fujii
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2026-06-08
セミナーレポート
iTHEMS Math Seminar by Mikhail Khovanov on May 28, 2026
On May 28, 2026, iTHEMS hosted a special iTHEMS Math Seminar, “Introduction to Categorification and Link Homology,” delivered by Professor Mikhail Khovanov of Johns Hopkins University. The event was held in a hybrid format at Okochi Hall and via Zoom, with more than 80 participants attending in person and over 70 joining online. Professor Khovanov is a leading mathematician whose work has had a major influence on knot theory, low-dimensional topology, representation theory, and mathematical physics. He is especially well known for introducing the categorification of the Jones polynomial, now called "Khovanov homology". In the talk, Professor Khovanov introduced the idea of “categorification” by starting from the classical relationship between the Euler characteristic and homology groups in topology. He then discussed the Jones polynomial, a knot invariant introduced by mathematician V. F. Jones in the 1980s, with particular emphasis on its representation-theoretic interpretation. He explained how this invariant can be lifted to a homology theory, guiding the audience toward the construction of Khovanov homology. He concluded the talk by mentioning future directions of the theory, including its connections to algebraic geometry and geometric representation theory. Reported by Taketo Sano
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2026-06-04
今週の論文Week 1, June 2026
Title: Noise spectroscopy of two-body loss as a probe of dynamical bulk viscosity in ultracold atomic gases Author: Tingyu Zhang, Hiroyuki Tajima, Takeo Kato arXiv: http://arxiv.org/abs/2606.01835v1 Title: Equivalence of additive and parametric pinning control protocols for systems of weakly coupled oscillators Author: Riccardo Muolo, Yuzuru Kato Journal Reference: 2026 SICE International Symposium on Control Systems (SICE ISCS) doi: https://doi.org/10.23919/SICEISCS67856.2026.11524551 Title: Solving models with generalized free fermions II: Path-product expansion and conserved charges Author: Kohei Fukai, Balázs Pozsgay, István Vona arXiv: http://arxiv.org/abs/2605.31453v1
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2026-06-03
受賞情報
平島敬也 基礎科学特別研究員が「HPCIソフトウェア賞開発部門賞優秀賞」を受賞
平島敬也 基礎科学特別研究員が、一般社団法人HPCIコンソーシアムが主催する「HPCIソフトウェア賞開発部門賞優秀賞」を受賞しました。 HPCIソフトウェア賞は、計算科学分野の発展に貢献した優れたソフトウェアの開発者や普及活動に携わる若手研究者・団体を表彰する賞です。開発部門賞では、大規模計算などの計算科学において特に有益なソフトウェアの開発が評価されます。 今回の受賞は、「AIを組み合わせた銀河シミュレーションコード『ASURA-FDPS-ML』の開発」に対して授与されました。ASURA-FDPS-MLは、銀河形成・進化の数値シミュレーションと機械学習技術を組み合わせることで、大規模な宇宙・銀河シミュレーションの効率化や高度化を目指した研究開発成果です。 本受賞は、計算科学とAI技術を融合した先進的な研究開発が高く評価されたものです。
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2026-06-03
受賞情報
森川億人 基礎科学特別研究員が「第21回素粒子メダル奨励賞」を受賞
森川億人 基礎科学特別研究員が、2026年度第21回素粒子メダル奨励賞を受賞しました。本賞は、素粒子論分野において優れた研究業績を挙げた若手研究者に授与される賞です。 受賞対象となった論文では、量子力学や場の理論において重要な役割を果たす共鳴状態について、厳密WKB法に基づく統一的な解析枠組みを構築しました。従来は別々の手法として発展してきたZel'dovich正則化、complex scaling法、rigged Hilbert spaceによる記述を非摂動論的な観点から結び付けることで、共鳴状態を統一的に理解するための基盤を与えました。さらに、具体的な可解模型を用いてその有効性を示し、散乱理論や非エルミート量子系、リサージェンス理論をつなぐ新たな視点を提示したことが高く評価されました。 本研究は、共鳴状態を含む量子論の基礎的理解を深めるとともに、今後、より一般の量子系や場の理論、量子重力における非摂動的構造の解析への発展が期待されています。
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2026-06-02
プレスリリース
高性能な日本語医療LLMの開発と安全性検証を実施
NEDOの「日本語版医療特化型LLMの社会実装に向けた安全性検証・実証」事業において、東京大学、理化学研究所、九州大学など10機関の共同研究チームが、医療現場の事務作業を支援する高性能な日本語LLMを開発しました。専門医試験を模した評価では最大90.8%の正答率を達成し、最先端の商用LLMに迫る性能を実現するとともに、日本の医療特性を踏まえた安全性検証も行われました。 iTHEMS 医科学深層学習チームの清田 純チームディレクターも参画しており、本プロジェクトの研究開発に貢献しました。 詳細はNEDOのプレスリリース記事をご覧下さい。
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2026-05-28
今週の論文Week 5, May 2026
Title: Revisiting boundary electromagnetic duality and edge modes Author: Keito Shimizu, Sotaro Sugishita arXiv: http://arxiv.org/abs/2605.27870v1 Title: Estimation of potential radius based on momentum distribution of a constituent particle Author: Eisuke Kawamura, Kotaro Murakami, Daisuke Jido arXiv: http://arxiv.org/abs/2605.28323v1 Title: Fermionic Bubble Loop in Cosmological Collider Revisited: Exact signals from spectral and Mellin-Barnes methods Author: Shuntaro Aoki, Zhehan Qin, Masahide Yamaguchi, Yuhang Zhu arXiv: http://arxiv.org/abs/2605.28054v1 Title: Thom polynomials relative to prescribed maps around the boundary Author: Masato Tanabe arXiv: http://arxiv.org/abs/2603.15010v2 Title: A Casimir obstruction to asymptotically flat black-brane completions of non-supersymmetric 7-branes Author: Yuta Hamada, Hayate Kimura arXiv: http://arxiv.org/abs/2605.25588v1 Title: Beyond Local Detailed Balance: Microscopic Rates Reshape Nonequilibrium Phase Behavior Author: Takahiro Kanazawa, Kyogo Kawaguchi, Kyosuke Adachi arXiv: http://arxiv.org/abs/2605.25406v1 Title: The Pseudospectral Method for the Dirac Equation with Confining Potential Author: Dengshan Liu, Huihui Xie, Pengxiang Du, Jian Li, Tomoya Naito arXiv: http://arxiv.org/abs/2605.25390v1 Title: Thermal Spin Polarization Driven by Nuclear Spin-Orbit Coupling in Neutron Star Pasta Author: Hiroyuki Tajima, Yuta Sekino, Hiroshi Funaki, Shota Kisaka, Nobutoshi Yasutake, Mamoru Matsuo arXiv: http://arxiv.org/abs/2605.25067v1 Title: Dense $\mathrm{QC_2D_2}$ with uniform matrix product states Author: Kohei Fujikura, Yoshimasa Hidaka arXiv: http://arxiv.org/abs/2605.17183v1 Title: Detectability of avoided crossings in black hole ringdowns Author: Hayato Imafuku, Naritaka Oshita, Hiroki Takeda arXiv: http://arxiv.org/abs/2605.16199v1 Title: Spin Hall effect and Berry curvature of gravitons from quantum field theory Author: Ritsuki Ito, Kazuya Mameda, Naoki Yamamoto arXiv: http://arxiv.org/abs/2605.19817v1 Title: Multiwavelength Probes of Cosmic Ray Transport in Molecular Cloud Structures Author: Hayden P. H. Ng, Ellis R. Owen, Naomi Tsuji, Szu-Ting Chen arXiv: http://arxiv.org/abs/2605.16698v1 Title: Multicellular simulations with shape and volume constraints using optimal transport Author: Antoine Diez, Jean Feydy arXiv: http://arxiv.org/abs/2402.17086v4 Title: Editorial Trajectories in Wikipedia Reflect Underlying Hyperlink Structure Author: Yeonji Seo, Mi Jin Lee, Seung-Woo Son, Hang-Hyun Jo, Yohsuke Murase arXiv: http://arxiv.org/abs/2605.16850v1
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2026-05-26
プレスリリースフェルミ面の情報からトポロジカル超伝導体を同定
理化学研究所（理研）数理創造研究センター 数理基礎部門の小野 清志郎 基礎科学特別研究員（研究当時、現 国内外連携・人材育成部門 客員研究員）らの国際共同研究グループは、超伝導体のトポロジカルな性質を、電気伝導や超伝導を担う電子状態を表す「フェルミ面」の情報から見分ける理論公式を構築しました。 本研究成果は、膨大な物質群の中からトポロジカル超伝導体を効率よく探すための基盤となり、候補物質の理論予測や実験探索の加速に貢献すると期待されます。 詳細は理化学研究所のプレスリリースをご覧下さい。
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2026-05-25
プレスリリース
並進対称性が“元に戻せなくなる”新現象を発見
京都大学 基礎物理学研究所の大石 翼、齊藤 巧磨 博士後期課程学生、理化学研究所の戎弘 実 研究員らの研究グループは、内部対称性と並進対称性の組み合わせによって生じるLieb–Schultz–Mattis（LSM）制約を持つ任意の次元の系において、ゲージ化と呼ばれる大域的な対称性を局所的なものへ変換する操作を行うと、並進対称性そのものが非可逆な対称性へと変化することを明らかにしました。 詳細は京都大学のプレスリリースをご覧下さい。
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2026-05-21
今週の論文Week 4, May 2026
Title: Black-hole formation and thermalization in open JT gravity Author: Ryo Adachi, Rumi Hasegawa, Takanori Ishii, Daichi Takeda arXiv: http://arxiv.org/abs/2605.14573v1 Title: Simulation of vibrational dynamics using qubits and qudits Author: Erik Lötstedt, Kaoru Yamanouchi arXiv: http://arxiv.org/abs/2605.12866v1
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2026-05-18
ホットトピック
坂本健板橋区長が5月14日にiTHEMSを訪問
5月14日、坂本健板橋区長がiTHEMSの磯センター長を訪問されました。 坂本区長から板橋区の取組や基本構想についてご紹介いただいた後、磯センター長よりiTHEMSの理念や活動についてご説明しました。その後、研究本館東側2階から4階のiTHEMSスペースを見学され、議論中の研究員らと交流されました。 さらに、記念史料室において、板橋区ともゆかりのある貴重な史料をご覧になりました。
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2026-05-18
ホットトピック
トークイベント「役に立たない科学とアート vol.2」が東京都現代美術館で開催
東京都現代美術館で開催中の展覧会「MOTコレクション Mission∞Infinity：宇宙×芸術×量子」の関連イベントとして、2026年5月6日（水）、トークイベント「役に立たない科学とアート vol.2 〜“役に立たない“科学とアートを試作する〜」が開催されました。 本イベントは、量子ブラックホール理論に着想を得た作品《Black Hole Recorder》に関連して企画されたもので、研究者とクリエイターが登壇し、「一見すると役に立たない」発想がもたらす新たな可能性について議論が行われました。当日は約110名が参加しました。講演では、《Black Hole Recorder》のコンセプトや制作の背景にある理論的発想について紹介され、会場ではリスニングセッションを通じてその一端が体験されました。 登壇者は、初田哲男（理化学研究所 数理創造研究センター 量子数理科学チームディレクター）、橋本幸士（京都大学大学院理学研究科 教授）、小塚仁篤（ADKマーケティング・ソリューションズ クリエイティブディレクター）、児玉悠（同 エクスペリエンスデザイナー）の4名で、それぞれの専門分野の立場から科学とアートの協働について意見が交わされました。 橋本氏は、量子物理学の概念を音楽表現へと展開するなど、「量子×音楽」をテーマに科学と芸術を横断する活動にも取り組んでいます。 本企画は連続トークイベントの第2回として実施され、前回に引き続き、学術と創造的実践を横断する試みの意義について議論が深められました。 イベント終了後には、展覧会参加作家やアーティスト、研究者らによるラップアップトークが行われ、引き続き同メンバーが参加しました。
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2026-05-14
ホットトピック
iTHEMS × academist オンラインイベント「数理で読み解く科学の世界2026」を開催しました
理化学研究所 数理創造研究センター（iTHEMS）は、2026年4月18日（土）、アカデミスト株式会社と共同でオンラインイベント「数理で読み解く科学の世界2026」を開催しました。 本イベントでは、数理科学を軸として多様な分野にわたる講演が行われました。小泉淳之介、福島理、洪木子、大窪健児が登壇し、それぞれの専門分野について講演を行いました。各講演は具体例を交えながら進められ、コメンテーターとのやり取りや質疑応答の時間も設けられるなど、理解を深める工夫がなされました。 また、昼休みには甘利俊一栄誉研究員と磯暁センター長による企画「AI時代の知性と学び」が行われ、AIが人間の知的活動にどのように関わるのかや、学び方の変化について、具体例を交えた対話形式で議論が展開されました。 イベント後のアンケートでは満足度は高く、発表内容については「やや難しい」との声がある一方で、「分かりやすい」との評価も多く寄せられました。本イベントには303名（延べ528名）が参加し、最大同時接続数は184名を記録しました。
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2026-05-14
今週の論文Week 3, May 2026
Title: A Monte Carlo Study of the Dipolar Universality Class in Three Dimensions Author: Akira Matsumoto, Yu Nakayama, Toshiki Onagi, Slava Rychkov arXiv: http://arxiv.org/abs/2605.11573v1 Title: A stabilized dual-SAV parametric finite element framework for constrained planar geometric flows with mesh regularization Author: Koya Sakakibara arXiv: http://arxiv.org/abs/2605.11721v1 Title: Non-Parametric Equation of State Reveals Non-Conformal Behavior Beyond Neutron Star Densities Author: Yong-Jia Huang, Shao-Peng Tang, Yi-Zhong Fan arXiv: http://arxiv.org/abs/2605.08584v1 Title: Cooling of Isolated Neutron Stars with Hyperon-mixed Kaon-Condensation Matter Author: Bhavnesh Bhat, Akira Dohi, Takumi Muto, Tsuneo Noda arXiv: http://arxiv.org/abs/2605.09723v1 Title: Classification of Chimera States via Fourier Analysis and Unsupervised Learning Author: Rommel Tchinda Djeudjo, Riccardo Muolo, Thierry Njougouo, Timoteo Carletti arXiv: http://arxiv.org/abs/2605.09401v1 Title: Chemical Bond Analysis in Biomolecular Systems Using Intrinsic Atomic and Bond Orbitals (IAOs and IBOs) with PySCF Author: Mariia Ivonina doi: https://doi.org/10.26434/chemrxiv.15002966/v1 Title: Positivity of the gravitational path integral implies the axionic weak gravity conjecture Author: Gabriele Di Ubaldo, Luca V. Iliesiu, Henry W. Lin, Cynthia Yan arXiv: http://arxiv.org/abs/2605.05305v1
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2026-05-11
ホットトピック
数理遺伝学ECL研究ユニットが2026年4月27日–28日にリトリートを実施
2026年4月27日から28日にかけて、数理遺伝学ECL研究ユニットはSUURI-COOL Kyotoで二日間のリトリートを行いました。4月に新たなメンバーが加わったこともあり、今回は普段の研究環境を離れ、チーム全員で交流を深める良い機会となりました。 本ユニットは2024年に発足し、この一年半で6人体制へと成長しました。現在は、ユニットリーダーのシュパイデル玲雄、アシスタントの岩浪僚子さん、昨年加わったLucas SortさんとAina Colomer i Vilaplanaさんに加え、今年からはポスドク研究員のAlba Nieto Herediaさんと博士課程の平澤さつきさんが新たにユニットに加わりました。 私たちは、DNAが世代を超えてどのように受け継がれてきたのかを数理的・統計学的に解析し、ゲノムに刻まれた人類の歴史を読み解く研究を行っています。DNAには、人類の移動や適応、ヒトの起源といった人類史の痕跡が刻まれているほか、進化や健康に関わる手がかりも含まれています。私たちは、数万人規模の現代人ゲノムデータや、古代人の骨から得られたDNAを解析することで、人類集団の成り立ちを明らかにしようとしています。DNAに残された痕跡は、歴史書には記されていない人々の暮らしや移動の歴史を今に伝えています。 今回のリトリートでは、普段の研究活動ではあまり共有する機会のないテーマを持ち寄りました。まず、各自が科研費申請を想定した研究アイデアを発表する模擬グラントセッションを行いました。続いて、日々の研究で活用している実践的な技術を紹介するセッションを実施し、Ainaさんによる図表デザイン、AlbaさんによるVS CodeでのAIツール活用、LucasさんによるLaTeX、平澤さんによる古代DNAシーケンス、そして岩浪さんによる事務手続きのコツなど、多彩な内容が共有されました。最後には、日本の先史時代から古代国家の成立、平安貴族文化、さらに江戸時代に至るまで、日本史をたどるセッションも行いました。添付の写真は京都府宇治市の平等院で撮影したもので、平安時代の文化や歴史の面影を実際に感じることができました。
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2026-05-11
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RIKEN iTHEMSと台湾NCTSが優れた若手研究者の発掘を目的とした共同研究を開始、調印式を開催
2026年4月に理化学研究所数理創造研究センター (iTHEMS)と台湾・国家理論科学中心 (NCTS)との間で「数理を軸とする分野横断的手法による、物質、生命、宇宙の解明や、社会における基本問題の解決（Mathematical Frontiers for Matter, Life, and the Universe）」に関する共同研究を開始し、4月23日に国立台湾大学（NTU）において調印式を開催しました。 式典には、理研からはiTHEMS センター長 磯暁、副センター長 兼 国内外連携・人材育成部門長 長瀧重博、副センター長 河東泰之、コーディネータ 永井智哉の他、国立台湾大学からは、Executive Vice President Chih-Hsing Yang、Vice President of Research and Development (R&D) Chung-Chih Wu、NCTS Director Pei-Ming HoとNCTS Director Ming-Lun Hsieh、他、複数機関から物理、数学を中心とする理論科学分野の研究者が参加しました。 今回の共同研究により、研究者交流の拡大、国際シンポジウムの共同開催、最先端の理論科学分野における国際共同研究の推進等を通じて、両機関の協力関係を一層深めます。 また、本連携を通じて、若手理論研究者に対し、高い自由度のもとで研究に取り組める環境を提供するとともに、アジアを代表する理論物理・数学コミュニティーにまたがり、幅広い研究分野やその境界領域の研究者と協働できる貴重な機会の創出を目指します。
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2026-05-07
今週の論文Week 2, May 2026
Title: Implementation of the Habegger--Lin decision algorithm Author: Yuka Kotorii, Atsuhiko Mizusawa arXiv: http://arxiv.org/abs/2605.04433v1 Title: Quasinormal modes and continuum response of de Sitter black holes via complex scaling method Author: Shoya Ogawa, Okuto Morikawa, Takuya Hirose arXiv: http://arxiv.org/abs/2605.03277v1 Title: Generalized Free Fields in de Sitter from 1D CFT Author: Kanato Goto, Alexey Milekhin, Herman Verlinde, Jiuci Xu arXiv: http://arxiv.org/abs/2605.03037v1 Title: Loop expansion in polymer field theory: application to phase separation Author: Kiyoharu Kawana, Kyosuke Adachi arXiv: http://arxiv.org/abs/2605.01261v1 Title: A variational approach to estimating the state of a magma reservoir from observed displacement Author: Shungo Kun Tonoyama, Atsushi Suzuki, Takemasa Miyoshi arXiv: http://arxiv.org/abs/2605.00409v1 Title: Examination of the $c\bar{c}+n+^{10}$Be bound-state problem within three cluster models based on QCD charmonium-nucleon interactions Author: Faisal Etminan arXiv: http://arxiv.org/abs/2604.27652v1 Title: Anomalous tunneling as a low-energy theorem for Nambu-Goldstone modes Author: Keisuke Fujii, Daichi Kagamihara, Masaru Hongo arXiv: http://arxiv.org/abs/2604.27489v1
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2026-04-30
受賞情報
土井琢身 専任研究員が令和8年度 文部科学大臣表彰 科学技術賞（研究部門）を受賞
理化学研究所 数理創造研究センター（iTHEMS）の土井琢身 専任研究員が、令和8年度 科学技術分野の文部科学大臣表彰「科学技術賞（研究部門）」を受賞しました。 本賞は、科学技術分野において顕著な研究業績を挙げた研究者に贈られるものです。土井専任研究員は、「第一原理に基づく現実的ハドロン間力と新奇ハドロンの研究」により受賞しました。
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2026-04-30
ホットトピック
Farewell message from Iao-Fai Io
Our colleague, Iao-Fai Io, will be returning to National Taiwan University starting in May to complete his Ph.D. We will miss him and wish him all the best in his future career. Here is a message from Iao-Fai: I joined iTHEMS in May 2025 as an International Program Associate (IPA). Over the past year, I have been very happy to be part of the iTHEMS member. RIKEN is one of national research institute in Japan, during my time here I had the opportunity to attend many high-quality seminars and workshops. I have also had the opportunity to visit and interact with member from different centers in RIKEN(such as CEMS, FQSP, RQC, etc.). I am also very grateful for the “coffee meetings” and “iTHEMS Now & Next” events, which helped me understand iTHEMS and learn about research which is beyond my own field. I would like to express my sincere gratitude to my host researcher, Dr. Ching-Kai Chiu. He has taught me a great deal about research, particularly in superconductivity and altermagnetism, which has significantly improved my research abilities in condensed matter theory. Whenever I encountered difficulties in my research, he was always willing to discuss them with me and suggest valuable advice. I am also grateful to him for introducing me his collaborators, including Congcong Le (a former iTHEMS member) and collaborators from China. In addition, I would like to thank him for his support during my visits abroad. I would also like to thank Tomoko Iwanami-san and Chikako Ota-san for their administrative support. In addition, I am grateful to all the people I have met at iTHEMS over the past year (such as Yan, Xiaoyang, Duc-Truyen, Tianyin, Zhe, Jinyang, Rumi, Yuta, Brian, Shuntaro, Lingxiao, Muzi, Sho, Satsuki, Iso, Haruki, Tada, Hatsuda, etc.). Over the coming year, I will return to National Taiwan University to complete my Ph.D., while also beginning to apply for postdoctoral positions. In the future, if I have the opportunity, I would be happy to visit RIKEN iTHEMS again. I sincerely hope to see you all again in the near future.
102件のニュース / 2026年