ニュース
57件のニュース / 2025年
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2025-05-01
セミナーレポート
From Quarks to Neutron Stars: Insights from kHz gravitational waves on April 23, 2025
This conference focused on the role of high-frequency gravitational waves in advancing multi-messenger astrophysics. Key topics included binary neutron star mergers, such as GW170817, and future prospects for observing core-collapse supernovae using electromagnetic signals, neutrinos, and gravitational waves. Discussions highlighted the importance of kilohertz-band gravitational waves in probing the dense interiors of neutron stars, where exotic matter may exist. The seminar also introduced new detector concepts like NEMO in Australia and planned KAGRA upgrades aimed at enhancing high-frequency sensitivity. The event featured expert talks and posters, promoting collaboration and new research directions in nuclear and neutron star physics. Reported by Shuntaro Aoki
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2025-05-01
今週の論文Week 1, May 2025
Title: High energy extragalactic multimessenger backgrounds from starburst and dead galaxies Author: Ellis R. Owen, Yoshiyuki Inoue, Tatsuki Fujiwara, Albert K. H. Kong arXiv: 2504.18721 Title: Lindblad dynamics in holography Author: Takanori Ishii, Daichi Takeda arXiv: 2504.17320 Title: Explosive production of Higgs particles and implications for heavy dark matter Author: Seishi Enomoto, Nagisa Hiroshima, Kohta Murase, Masato Yamanaka arXiv: 2504.17127 Title: FRG analysis for relativistic BEC in arbitrary spatial dimensions Author: Fumio Terazaki, Kazuya Mameda arXiv: 2504.17668
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2025-04-24
今週の論文Week 4, April 2025
Title: Cosmic ray neutrons in magnetized astrophysical structures Author: Ellis R. Owen, Yoshiyuki Inoue, Tatsuki Fujiwara, Qin Han, Kinwah Wu arXiv: 2504.15802 Title: A magnetar powers the luminous supernova 2023pel, associated with a long gamma-ray burst Author: L. M. Roman Aguilar, M. M. Saez, K. Ertini, M. C. Bersten arXiv: 2504.11414 Title: Performance guarantees of light-cone variational quantum algorithms for the maximum cut problem Author: Xiaoyang Wang, Yuexin Su, Tongyang Li arXiv: 2504.12896 Title: Computing n-time correlation functions without ancilla qubits Author: Xiaoyang Wang, Long Xiong, Xiaoxia Cai, Xiao Yuan arXiv: 2504.12975
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2025-04-23
ホットトピック
iTHEMS x academist online event was held on April 19, 2025
iTHEMS held an online lecture event for the general public with the help of Academist Inc., on April 19, 2025. This year’s speakers were Yuuka Kanakubo, Kan Kitamura, Leo Speidel, and Yuki Yokokura, who delivered clear and easy-to-understand lectures that even middle school students could comprehend. Each speaker also served as a commentator for other lectures and facilitated Q&A sessions based on audience questions. During the lunch break, as part of the lunch program, Director Iso, a physicist, and Prof. Fumiharu Kato, a mathematician, engaged in a discussion about the future possibilities of mathematics, moderated by Ms. Shinozaki. The event was organized and hosted by Ms. Michibayashi and Mr. Katada from Academist, who helped make the event a success. The event was attended by 414 people, and at one point there were over 250 in the audience.
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2025-04-17
今週の論文Week 3, April 2025
Title: Cohomology ring of unitary N=(2,2) full vertex algebra and mirror symmetry Author: Yuto Moriwaki arXiv: 2504.09919
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2025-04-17
受賞情報
本多正純上級研究員が文部科学大臣表彰を受賞
文部科学省が令和7年度科学技術分野の文部科学大臣表彰受賞者を発表し、本多正純 上級研究員が受賞しました。 本多正純 上級研究員は、”場の量子論の強結合ダイナミクスに関する研究”における卓越した成果が評価され、文部科学大臣表彰 若手科学者賞を受賞しました。 おめでとうございます！
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2025-04-14
リサーチニュース
RIKEN Research: When it comes to modeling, even unmeasurable data tells us something
Mathematical models for predicting how cancer tumors in mice grow over time can give distorted results if unmeasurable data is ignored, a team that includes two RIKEN researchers has shown1. This finding has important implications when applying mathematical models to medicine. A self-confessed data geek, Catherine Beauchemin of the RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS) specializes in applying the power of math to everything from viruses to supernovae. “I love trying to figure out what data are telling us,” she says. Seeking new insights into cancer mechanisms, Beauchemin’s team used mathematical models to analyze previously published data of tumor-size measurements over time for ten mice. To read more, please visit the related link.
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2025-04-14
リサーチニュース
RIKEN Research: Refined test could improve Parkinson’s disease diagnosis
A team that includes a RIKEN researcher has refined a lab test for measuring protein aggregate levels in samples from patients with certain neurodegenerative diseases1. This has the potential to improve diagnosis and drug development for these diseases. Synucleinopathies are neurodegenerative diseases such as Parkinson’s disease and dementia with Lewy bodies. They are associated with the accumulation of aggregates of misfolded alpha-synuclein proteins in the brain and spinal cord. “When a misfolded alpha-synuclein protein in a neuron encounters one of its properly folded counterparts, it causes it to become misfolded,” says Catherine Beauchemin of the RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences. “The two misfolded alpha-synuclein proteins stick together and cause other normal alpha-synuclein to misfold and aggregate.” To read more, please visit the related link.
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2025-04-14
プレスリリース周期駆動系で量子情報の非局在化を実証
菊池 勇太 客員研究員、早田 智也 客員研究員を含む共同研究グループは、周期駆動系を模した量子回路を用いることで量子情報が非局在化した状態（スクランブリング状態）を準備できることを、イオントラップ型量子コンピュータを用いて実証しました。 スクランブリング状態は、量子情報の復元や量子多体系計算に役立つことが期待される性質を持っています。本成果は、物理現象と量子情報が交錯する学術研究領域における黎明（れいめい）期の量子コンピュータ利用事例として、日本における量子コンピュータ利用の促進に貢献すると期待されます。 今回、共同研究グループは、これまでランダム性を持つ量子回路を用いて議論されることが一般的だったスクランブリング状態を、周期駆動系を模した量子回路を用いても準備できることを、高い忠実度で量子操作が可能な量子コンピュータの実機を用いて、適切なエラー緩和法と理論的考察の組み合わせにより確かめました。 詳細は、関連リンクより、プレスリリースをご覧下さい。
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2025-04-14
リサーチニュース
RIKEN NEWS: 量子シミュレーターで探る磁気の臨界輸送現象
関野 裕太 特別研究員のインタビュー記事が、理研の研究紹介ページ「クローズアップRIKEN 2025」の研究最前線に掲載されました。また、理研の広報誌「RIKEN NEWS」のSPRING 2025にも掲載されました。 粒子の集団である「多粒子系」の振る舞いを理論面から追究している関野 裕太 特別研究員。レーザーでつくる極微の格子（光格子）に原子を1個1個閉じ込め、その中で磁気の流れを捉える新たなモデルを考案しました。そして、そのモデルの理論計算から、不思議な磁気の輸送現象を見いだしました。 続きは、関連リンクをご覧ください。
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2025-04-10
今週の論文Week 2, April 2025
Title: Irrationality of the reciprocal sum of doubly exponential sequences Author: Junnosuke Koizumi arXiv: 2504.05933 Title: Re-evaluation of the deuteron-deuteron thermonuclear reaction rates in metallic deuterium plasma Author: Faisal Etminan arXiv: 2504.05003 Title: Thermonuclear superburst of MAXI J1752−457 observed with NinjaSat and MAXI Author: Amira Aoyama, Teruaki Enoto, Takuya Takahashi, Sota Watanabe, Tomoshi Takeda, Wataru Iwakiri, Kaede Yamasaki, Satoko Iwata, Naoyuki Ota, Arata Jujo, Toru Tamagawa, Tatehiro Mihara, Chin-Ping Hu, Akira Dohi, Nobuya Nishimura, Motoko Serino, Motoki Nakajima, Takao Kitaguchi, Yo Kato, Nobuyuki Kawai arXiv: 2504.04352 Title: Finite-Temperature Perturbation Theory of Rotating Scalar Fields Author: Ryo Kuboniwa, Kazuya Mameda arXiv: 2504.04712 Title: A satellite formula for real Seiberg-Witten Floer homotopy types Author: Jin Miyazawa, JungHwan Park, Masaki Taniguchi arXiv: 2504.03270
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2025-04-09
ホットトピック
センター長 磯暁のご挨拶
この4月、iTHEMS（数理創造研究センター）は、組織を大きく拡充しセンターとなり、次のフェーズへと歩みを進めました。今後も成長と進化を続けていきますが、iTHEMSの根幹にある精神は変わりません。
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2025-04-08
リサーチニュースRIKEN NEWS:「富岳」で協力行動の進化メカニズムに迫る
村瀬 洋介 上級研究員のインタビュー記事が、理研の研究紹介ページ「クローズアップRIKEN 2025」の研究最前線に掲載されました。また、理研の広報誌「RIKEN NEWS」のSPRING 2025にも掲載されました。 社会的な動物といわれる私たち人間は、他人とも力を合わせて助け合う「協力行動」をとります。村瀬 洋介 研究員ら国際共同研究チームは、そこで重要な役割を果たす「評判」に着目しました。スーパーコンピュータ「富岳」を用いて「評判」という情報のダイナミクスを解析した結果、見えてきたのは、協力行動によって、人類が進化してきた道筋でした。 続きは、関連リンクをご覧ください。
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2025-04-08
ホットトピック
iTHEMS Starter Meeting for FY 2025 on April 4, 2025
On Friday, April 4, 2025, the annual iTHEMS Starter Meeting was held at 12:30 PM in Suzuki Umetaro Hall. Unlike the regular Coffee Meetings that take place every Friday at the same time, the Starter Meeting marks the beginning of the academic year and serves as a special occasion to introduce new members, allow existing members to reintroduce themselves, and share the outlook for the year ahead. This year’s meeting was held on a larger scale than usual to commemorate a major organizational milestone—the transformation of iTHEMS from a program into the newly established RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences. The meeting opened with a commemorative talk by Tetsuo Hatsuda, former Program Director, who reflected on the history of interdisciplinary mathematical science research at RIKEN, beginning with the iTHES program and leading up to the evolution of iTHEMS. He also expressed heartfelt appreciation for the contributions of former Deputy Program Directors Takashi Tsuboi and Takemasa Miyoshi. Following his talk, the new Center Director, Satoshi Iso, provided an overview of the structure and vision for the newly reorganized iTHEMS, including the establishment of new research units and teams designed to further expand and deepen the center’s interdisciplinary mission. Flower bouquets were then presented to Hatsuda-san and Tsuboi-san as a gesture of gratitude, while Miyoshi-san, who was absent, was also acknowledged for his contributions. After a brief intermission, Tsukasa Tada, Deputy Director, introduced the newly adopted iTHEMS Code of Conduct. He emphasized its core principles—mutual respect, scientific integrity, inclusivity, and responsibility—and explained how the Code reflects the ethical foundation that each member is encouraged to uphold and shape as the community evolves. This was followed by a series of one-minute self-introductions by all members, each using a single slide, continuing the tradition of fostering familiarity and collaboration across disciplines. The meeting concluded slightly before 5:00 PM, after which participants returned to the Main Research Building to attend a reception in the open space on the third floor. The reception provided an opportunity for further discussion and networking among iTHEMS members and affiliated researchers, marking a warm and promising start to the new academic year under the expanded vision of the iTHEMS Center.
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2025-04-08
ホットトピック
Takashi Tsuboi Appointed Honorary Research Fellow at RIKEN
The former Deputy Program Director of iTHEMS, Takashi Tsuboi, has been appointed "Honorary Research Fellow" at RIKEN by President Makoto Gonokami, effective April 1, 2025.This honor recognizes Takashi’s many years of distinguished service as Deputy Program Director of iTHEMS (FY2017–FY2024), as well as his outstanding achievements and dedicated contributions. He will continue to support iTHEMS as a Senior Visiting Scientist. Congratulations, Takashi!
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2025-04-07
受賞情報
Yan Lyu received FY2024 RIKEN Excellent Achievement Award (RIKEN BAIHO Award 理研梅峰賞)
Our colleague Yan Lyu received the FY2024 RIKEN Excellent Achievement Award (RIKEN BAIHO Award) on March 28, 2025, in recognition of his outstanding work on “Elucidation of Genuine Tetraquarks Based on Lattice Quantum Chromodynamics.” The photo was taken on April 4, 2025, on the way to Suzuki Umetaro Hall at the Wako campus. Congratulations, Yan!
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2025-04-07
受賞情報
Kyosuke Adachi received FY2024 RIKEN Research and Technology Incentive Award (RIKEN OHBU Award 理研桜舞賞)
Our colleague Kyosuke Adachi received the FY2024 RIKEN Research and Technology Incentive Award (RIKEN OHBU Award) on March 28, 2025, in recognition of his outstanding work on “Unveiling the Rules of Amino Acid Sequences Governing Protein Condensation.” The photo was taken on April 4, 2025, on the way to Suzuki Umetaro Hall at the Wako campus. Congratulations, Kyosuke!
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2025-04-03
今週の注目人物
Self-introduction: Erik Loetstedt
I have a PhD in theoretical physics from Heidelberg University and have worked at the Max Planck Institute for Nuclear Physics, Missouri University of Science and Technology and The University of Tokyo before coming to RIKEN. I am interested in time-dependent problems in quantum mechanics, in particular strong field-molecule interaction. I am also interested in the simulation of quantum dynamics of molecules by quantum computers.
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2025-04-03
今週の論文Week 1, April 2025
Title: Higgs-Modular Inflation Author: Shuntaro Aoki, Hajime Otsuka, Ryota Yanagita arXiv: 2504.01622 Title: The untangling number of 3-periodic tangles Author: Toky Andriamanalina, Sonia Mahmoudi, Myfanwy E. Evans arXiv: 2504.01747 Title: Universality of Rényi Entropy in Conformal Field Theory Author: Yuya Kusuki, Hirosi Ooguri, Sridip Pal arXiv: 2503.24353 Title: Unstable chords and destructive resonant excitation of black hole quasinormal modes Author: Naritaka Oshita, Emanuele Berti, Vitor Cardoso arXiv: 2503.21276 Title: Non-perturbative formulation of resonances in quantum mechanics based on exact WKB method Author: Okuto Morikawa, Shoya Ogawa arXiv: 2503.18741 Title: A Promising Method for Strongly Correlated Electrons in Two Dimensions: Gutzwiller-Guided Density Matrix Renormalization Group Author: Hui-Ke Jin, Rong-Yang Sun, Hong-Hao Tu, Yi Zhou arXiv: 2503.18374 Title: Effective field theory for weakly bound two-neutron halo nuclei: corrections from neutron-neutron effective range Author: Davi B. Costa, Masaru Hongo, Dam Thanh Son arXiv: 2503.18519 Title: Path to an exact WKB analysis of black hole quasinormal modes Author: Taiga Miyachi, Ryo Namba, Hidetoshi Omiya, Naritaka Oshita arXiv: 2503.17245 Title: Observation of Two Cascading Screening Processes in an Iron-based Superconductor Author: Ming-Hua Chang, Steffen Backes, Donghui Lu, Nicolas Gauthier, Makoto Hashimoto, Guan-Yu Chen, Hai-Hu Wen, Sung-Kwan Mo, Zhi-Xun Shen, Roser Valenti, Heike Pfau arXiv: 2503.06314 Title: Monte Carlo study on Heisenberg model with local dipolar interaction Author: Etsuko Itou, Akira Matsumoto, Yu Nakayama, Toshiki Onagi arXiv: 2503.15874
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2025-04-01
ホットトピック
Farewell message from Daiki Kumakura
Our colleague, Daiki Kumakura, joins R&D Division at Daiichi Sankyo Co. as Translational Scientist after receiving PhD last week from Hokkaido University. We wish him the best of luck in this new endeavor. Here is a message from Daiki: I joined iTHEMS as a Junior Research Associate (JRA) in April 2022, and since then I have been fortunate to experience a wealth of opportunities and engaging discussions that go far beyond what I encountered at university. When I started as a JRA, I set myself the dual goals of advancing both research and education. In research, I pursued mathematical and computational analyses with a focus on microbial themes. In education, I established a Young Researchers in Mathematical Biology group for students and organized a summer school. Additionally, I participated in public outreach by designing a “one poster per family” project, and through appearances on FM radio and our university’s YouTube channel, I helped spread the excitement of mathematical science and the unique identity of iTHEMS to students throughout Japan. I am deeply grateful to the many individuals at iTHEMS whose support made all of these endeavors possible. Thank you from the bottom of my heart. Starting in April 2025, I will be embarking on a new chapter as a Translational Scientist at Daiichi Sankyo Co., Ltd. In this role, I will analyze and interpret clinical trial data across various disease areas, including cancer, with the aim of enabling faster and more appropriate drug prescriptions for patients. I look forward to applying the invaluable experiences I gained at iTHEMS to establish a strong position for mathematical science in industrial applications. My career has flourished thanks to iTHEMS, and I sincerely wish for the continued growth and success of the iTHEMS community. I hope to maintain close ties with all of you in the future. Thank you very much for everything.
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2025-03-28
書籍
原子核・ハドロン物理学の探究
初田哲男、他 [著] 発売日：2025年2月
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2025-03-27
書籍
数の「発見」の物語
宮﨑 弘安 [著] 発売日：2025年3月25日
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2025-03-26
セミナーレポート
A Century of Quantum Mechanics by Gordon Baym on March 24, 2025
On March 24, Professor Gordon Baym gave a joint seminar hosted by the Department of Physics at the University of Tokyo and RIKEN iTHEMS, held at the Hongo campus of the University of Tokyo. His talk focused on the history of quantum mechanics, tracing its development and highlighting the contributions of key figures such as Max Planck, Albert Einstein, Niels Bohr, and Werner Heisenberg. He also discussed the profound impact of quantum mechanics on modern technology, particularly its role in the invention of the transistor and the cellphone. In addition, Professor Baym offered inspiring insights into the importance of phase information and the concept of the quantized photon. The seminar drew more than 100 attendees, including participants via Zoom, and concluded with a lively and engaging Q&A session. Reported by Tetsuo Hatsuda
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2025-03-24
ホットトピック
Farewell message from Akihisa Yamamoto
Our colleague, Akihosa Yamamoto, will be joining Department of Mechanical Systems Engineering, Faculty of Systems Design at Tokyo Metropolitan University as an Associate Professor starting April 1st, 2025. We will all miss him and wish him the best of luck in this new endeavor. Here is a message from Akihisa: I joined RIKEN iTHEMS as a research scientist in April 2024. Although it has only been a year, I truly enjoyed my time here. I have encountered many exciting and diverse research topics that have significantly expanded my scientific horizons and thoroughly enjoyed attending seminars across various fields. Due to the great diversity and high quality of the presentations, it has not always been easy to grasp the key take-home messages and formulate relevant questions. Nonetheless, I have always enjoyed the opportunity to immerse myself in these stimulating discussions. I am also very grateful for the positive atmosphere of iTHEMS, fostered by talented and considerate colleagues. It has been a great pleasure to be a part of this fantastic institute, and I sincerely thank the Program Director Hatsuda-san and every member of iTHEMS including all the assistants for collectively maintaining such a supportive environment. I will be appointed as an Associate Professor in the Biomechanical Engineering Area in the Department of Mechanical Systems Engineering, Faculty of Systems Design at Tokyo Metropolitan University on April 1st, 2025. I plan to continue my exploration of the mechanistic understanding of homeostasis and the dynamics of living systems. I am sure that the scientific perspective and thought processes I have developed during my time at iTHEMS will remain with me throughout my scientific career. I sincerely wish for the continuous and even greater success of iTHEMS, and I look forward to staying in touch with iTHEMS members.
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2025-03-23
ホットトピック
Farewell message from Rongyang Sun
Our colleague, Rongyang Sun, will be joining Department of Physics and Astronomy, California State University Northridge, as a postdoctoral researcher, starting April 2025. We will all miss him and wish him the best of luck in this new endeavor. Here is a message from Rongyang: I joined iTHEMS in April 2023 as part of RIKEN Quantum, and you may not even meet me on campus as my base is at R-CCS in Kobe. Although my time in iTHEMS has been short, formally only half a year, and I participated in the events remotely most of the time, I learned so much, far more than I expected, from this active research institute, which owns the best diversity and productivity. I would like to thank all the members of iTHEMS, including the directors, researchers, and assistants. Thank you for giving me such a unique experience in my research career! While I am moving to the US, a physically very far away place, I will continue to follow the development of iTHEMS and share in its success. Starting in April 2025, iTHEMS will be upgraded to a research center. I sincerely wish all the members and the institute greater success in this new era!
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2025-03-20
今週の論文Week 4, March 2025
Title: Pair Correlation Conjecture for the zeros of the Riemann zeta-function I: simple and critical zeros Author: Daniel Alan Goldston, Junghun Lee, Jordan Schettler, Ade Irma Suriajaya arXiv: 2503.15449 Title: Frustration-free free fermions Author: Seishiro Ono, Rintaro Masaoka, Haruki Watanabe, Hoi Chun Po arXiv: 2503.14312 Title: Stable homotopy theory of invertible gapped quantum spin systems I: Kitaev's Ω-spectrum Author: Yosuke Kubota arXiv: 2503.12618 Title: Frustration-free free fermions and beyond Author: Rintaro Masaoka, Seishiro Ono, Hoi Chun Po, Haruki Watanabe arXiv: 2503.12879 Title: Modular-invariant random matrix theory and AdS{}_3 wormholes Author: Jan Boruch, Gabriele Di Ubaldo, Felix M. Haehl, Eric Perlmutter, Moshe Rozali arXiv: 2503.00101
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2025-03-18
ホットトピック
Farewell message from Steffen Backes
Our colleague, Steffen Backes, will be joining the RIKEN TRIP Research DX Team as an Expert Technician, starting April 1, 2025. We will all miss him and wish him the best of luck in this new endeavor. Here is a message from Steffen: I joined iTHEMS and RIKEN in August 2023, so only about 1.5 years ago, but this time had a lasting impression on my personal life and scientific career. It is hard to overstate how much I enjoyed being part of iTHEMS, as it has been an incredibly enjoyable and rewarding time. Being able to meet so many knowledgeable and kind people from different fields and parts of the world, and coming up with new and unconventional ideas due to different backgrounds, was truly amazing. I am very grateful for having been accepted to iTHEMS, which I think is a very special and outstanding place due to this diversity and scientific freedom, that is hard to be found elsewhere. In FY2025 (April 1st) I will change to an Expert Technician position in the RIKEN TRIP Research DX Team, Wako Campus, so I will still stay close to iTHEMS! As far as time allows, I will make sure to drop by and say hello :) Thank you everyone for this great time, and let's meet again soon!
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2025-03-13
今週の論文Week 3, March 2025
Title: Gyromagnetic Angular Momentum Interconversion in Neutron Stars Author: Hiroshi Funaki, Yuta Sekino, Hiroyuki Tajima, Shota Kisaka, Nobutoshi Yasutake, Mamoru Matsuo arXiv: 2503.06068 Title: Quartet correlations near the surface of N = Z nuclei Author: Yixin Guo, Tomoya Naito, Hiroyuki Tajima, Haozhao Liang arXiv: 2503.07051 Title: Landscape computations for the edge of chaos in nonlinear dynamical systems Author: Motoki Nakata, Masaaki Imaizumi arXiv: 2503.06393 Title: A diagrammatic approach to the Rasmussen invariant via tangles and cobordisms Author: Taketo Sano arXiv: 2503.05414 Title: Mirror-skin thickness: A possible observable sensitive to the charge symmetry breaking energy density functional Author: Tomoya Naito, Yuto Hijikata, Juzo Zenihiro, Gianluca Colò, Hiroyuki Sagawa arXiv: 2503.05147
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2025-03-12
ホットトピック
Farewell message from Jizhou Li
Our colleague, Jizhou Li, will be joining Professor Akira Shudo's group in the Department of Physics at Tokyo Metropolitan University as a postdoctoral researcher, starting April 1, 2025. We will all miss him and wish him the best of luck in this new endeavor. Here is a message from Jizhou: As I move on to my next position at Tokyo Metropolitan University, I just wanted to say a big thank you to all of you. I’ve really enjoyed the discussions, collaborations, and all the insightful talks at iTHEMS. The biology seminars and coffee meetings, in particular, have been a fantastic learning experience for me. Luckily, since I live just 1 km from RIKEN, I’m not going too far! I still plan to drop by for the biology seminar every Thursday, so I’m looking forward to more chats and discussions with you all. Thanks again, and see you around!
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2025-03-12
受賞情報
iTHEMS received the "RIKEN Diversity Innitiative Award 2024"
On March 7, 2025, iTHEMS was honored with the "RIKEN Diversity Promotion Award 2024." This marks the second consecutive recognition, following our receipt of the same award in 2023. The award acknowledges our collaborative efforts with Nara Women's University, including lectures and a visiting program since 2020, as a forward-thinking initiative to promote the active participation of women in science. A heartfelt thank you to everyone who contributed to making this initiative a success!
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2025-03-10
受賞情報
Tomoya Naito received the “PCM2025 Jury Prize”
Our colleague Tomoya Naito (Special Postdoctoral Researcher, iTHEMS) has received the “PCM2025 Jury Prize’” of the "Single-particle and collective motions from nuclear many-body correlation (PCM2025)” symposium. The outstanding presentation poster is entitled “Isospin symmetry breaking energy density functional based on quantum chromodynamics”. Congratulations, Tomoya!
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2025-03-06
リサーチニュース
Review on Physics-Driven Learning for Inverse Problems Published in Nature Reviews Physics
Nature Reviews Physics recently published a review paper on ”Physics-driven learning for inverse problems in quantum chromodynamics”, from DEEP-IN working group led by Lingxiao Wang (Research Scientist, iTHEMS), including Tetsuo Hatsuda (Program Director, iTHEMS). The authors explore how combining deep learning techniques with physics-driven designs significantly improves the extraction of accurate physical properties from complex QCD phenomena. Highlighting applications such as lattice QCD calculations and studies of hadron interactions, neutron stars, and heavy-ion collisions, the review emphasizes the benefits of embedding physical priors into machine learning models and suggests broader potentials to general physics problems.
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2025-03-06
今週の論文Week 2, March 2025
Title: Collective Neutrino Oscillations in Three Flavors on Qubit and Qutrit Processors Author: Luca Spagnoli, Noah Goss, Alessandro Roggero, Ermal Rrapaj, Michael J. Cervia, Amol V. Patwardhan, Ravi K. Naik, A. Baha Balantekin, Ed Younis, David I. Santiago, Irfan Siddiqi, Sheakha Aldaihan arXiv: 2503.00607
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2025-03-06
ホットトピック
理化学研究所-奈良女子大学理学部合同 ダイバーシティ推進ワークショップ2025が開催されました
奈良女子大学の数学、物理学、化学、生物科学、環境科学など異なるコースの学生たち（学部1回生/2回生/3回生、大学院博士前期課程1回生の合計19名）が3月3日と3月4日の2日間に理研を訪問し、RIBF施設、iTHEMS、知覚運動統合機構研究チーム(CBS)、光量子制御技術開発チーム(RAP)、 分子生命制御研究チーム(CSRS)を見学しました。それぞれの研究室で、実験機器の近くで最先端の研究の一端に触れるとともに、夕方からの理研研究者との交流会では、iTHEMS研究員のポスターでより深く研究内容について聞いて質問したり、研究者の日常生活やキャリアについて知り、学生たちは研究現場から刺激を受けていました。 このダイバーシティ推進活動は、奈良女子大学理学部と理研iTHEMSが共同で推進する事業として、奈良女子大学での連続講義とセットで行われているもので、次年度以降も継続する予定です。
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2025-02-27
今週の論文Week 5, February 2025
Title: Detection of molecular clouds in the PeVatron candidate source LHAASO J0341+5258 by the Nobeyama 45-m radio telescope Author: Naomi Tsuji, Shunya Takekawa, Kaya Mori, Alison Mitchell, Shuo Zhang, Priyadarshini Bangale, Stephen DiKerby, Tülün Ergin, Jooyun Woo, Samar Safi-Harb, Shinta Kausya arXiv: 2502.15432
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2025-02-25
ホットトピック
Farewell message from Jeffrey Fawcett
Our colleague, Jeffrey Fawcett will move on to a new career as a Chief Scientist at Regional Fish Institute, Ltd. as of March 1st, 2025. We all will miss him and wish him the best of luck in his latest endeavor. Here is a message from Jeffrey Fawcett: I will be moving to Kyoto to work at a company called Regional Fish from March. I will also most likely have a joint position at Kyoto University at a lab funded by the company. The company was started a few years ago mostly be people from Kyoto University, Graduate School of Agriculture, where I did my study, and specializes in breeding and developing fish and aquatic species using genome editing and various other techniques. My task will mainly be to perform genomic data analysis for the company, although I will also have some freedom to pursue my own research. I am looking forward to the new challenge to utilize my expertise and work for a company whose I mission I can identify with. I have been in iTHEMS for exactly 7 years, which say how much I enjoyed and appreciated the setup of iTHEMS. I remember some people telling me its their first time meeting a biologist, whereas I never imagined I would ever have the opportunity to enjoy talks on pure mathematics and theoretical physics. I would like to thank all the people involved in iTHEMS and hopefully I will be able to visit iTHEMS from time to time and keep up the connection.
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2025-02-25
セミナーレポート
Visit by ASCENT-6E high school students on January 13, 2025
On Monday, January 13th, 2025, we were glad to receive the visit of 15 high school students (13 female and 2 male) enrolled in the STELLA Program ASCENT-6E of Chiba University. The students, accompanied by the Program Director Prof. Jun Nomura, Prof. Atsushi Tsuji, and Program Coordinators Prof. Qian Wang and Prof. Hina Morishige, were welcome to a one-day workshop organized by iTHEMS members. The workshop consisted of a series of presentations in which iTHEMS members talked about some of the fundamental, yet unresolved, questions about our universe. We covered topics ranging from mathematics, biology, physics, and philosophy of science. The objective was to promote the curiosity of students towards science, using iTHEMS as an example of how scientists from different disciplines may interact and do research together under the same roof. We also took the chance to advertise the different RIKEN programs for young researchers and encouraged the students to follow their dreams of becoming professional scientists. During lunchtime and the interactive sessions, we also enjoyed nice opportunities to converse directly with the students, listen to their particular interests, and answer their questions. This visit by the STELLA program ASCENT-6E students was an invaluable opportunity for us at iTHEMS to understand the current situation of young students, their motivations, and their innovative ideas. For the sake of promoting love for science, inclusivity in academia, and a closer interaction with society, we hope that we can create more bridges between the iTHEMS members and the young students in the future. We are glad that the workshop was a success. Please see the webpage of STELLA Program ASCENT-6E to read some of the comments that students made regarding their visit to iTHEMS. Reported by José Said Gutiérrez-Ortega
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2025-02-25
セミナーレポート
Theories of Astrophysical Big Bangs 2025 on February 17, 2025
The international workshop “Theories of Astrophysical Big Bangs 2025” was held at RIKEN from February 17 to 19. During the workshop, Daniel Kasen (UC Berkeley), who is currently on sabbatical at RIKEN, delivered a special lecture on supernovae and kilonovae. In addition, 25 invited talks were presented, allowing participants to share the latest advancements in the field of Astrophysical Big Bangs. The workshop also featured 33 poster presentations, showcasing the diverse range of research in the field and fostering extensive discussions among participants. A total of 83 participants from six countries, including Japan, registered for the workshop. This event was supported by the JST ASPIRE project for top scientists: “RIKEN-Berkeley Mathematical Quantum Science Initiative”, which particularly contributed to strengthening research collaboration between RIKEN and UC Berkeley. The workshop is expected to serve as a catalyst for future joint research endeavors. Reported by Shigehiro Nagataki
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2025-02-20
今週の論文Week 4, February 2025
Title: Systematic study of the composition of Type I X-ray burst ashes: Neutron star structure v.s. Reaction rate uncertainties Author: Guoqing Zhen, Helei Liu, Akira Dohi, Guoliang Lü, Nobuya Nishimura, Chunhua Zhu, Renxin Xu arXiv: 2502.10992 Title: Chiral symmetry restoration in QC_2D from effective model using the functional renormalization group Author: G. Fejos, D. Suenaga arXiv: 2502.10134 Title: Birational Transformations and 2d (0,2) Quiver Gauge Theories beyond Toric Fano 3-folds Author: Dongwook Ghim, Minsung Kho, Rak-Kyeong Seong arXiv: 2502.08741 Title: Numerical evidence for a CP broken deconfined phase at θ=π in 4D SU(2) Yang-Mills theory through simulations at imaginary θ Author: Mitsuaki Hirasawa, Masazumi Honda, Akira Matsumoto, Jun Nishimura, Atis Yosprakob arXiv: 2502.09115
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2025-02-20
セミナーレポート
Pebbles in Planet Formation on February 10-13, 2025
From February 10 to 13, the workshop "Pebbles in Planet Formation" featured a diverse range of topics, including dust theory, solar system small body exploration, dust experiments, simulations of planetesimal formation via instabilities, and observations of protoplanetary disks. The program included six keynote talks, 40 contributed talks, and 18 poster presentations. Ample time was allocated for coffee breaks and discussion sessions, fostering in-depth conversations on various topics. In particular, the workshop reaffirmed the importance of collaboration between experimental groups in Germany and experimental and theoretical groups in Japan. As a result, we have established a foundation for ongoing communication and future cooperation. Reported by Misako Tatsuuma
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2025-02-13
今週の論文Week 3, February 2025
Title: Physics-Conditioned Diffusion Models for Lattice Gauge Theory Author: Qianteng Zhu, Gert Aarts, Wei Wang, Kai Zhou, Lingxiao Wang arXiv: 2502.05504
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2025-02-10
ホットトピックFarewell message from Nozomi Kakinuma
Our administrative staff member, Nozomi Kakinuma, will be leaving RIKEN on February 14 to return to academic research. We will greatly miss her and wish her all the best in her future endeavors. Here is a message from Nozomi: Since April last year, I have been part of iTHEMS as a staff member in the iTHEMS Promotion Office. However, I have recently decided to pursue a career in research. Through coffee meetings, where researchers passionately discussed their work and explained it in an accessible way, I came to deeply appreciate both the excitement and significance of fundamental research. Inspired by these experiences, I am now committed to dedicating myself to research. I am truly grateful for all the support and guidance I have received. Thank you very much.
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2025-02-10
プレスリリース
急性肝障害はどのような人が急性肝不全に進展しやすいのか？
九州大学病院 肝臓・膵臓・胆道内科/九州大学 大学院医学研究院の小川 佳宏 主幹教授、田中 正剛 助教、黒川 美穂 博士後期課程学生らの研究グループは、名古屋大学 大学院理学研究科の岩見 真吾 教授（兼 九州大学マス・フォア・インダストリ研究所 客員教授、理化学研究所 数理創造プログラム 客員研究員、京都大学高等研究院ヒト生物学高等研究拠点 連携研究者）、吉村 雷輝 博士後期課程学生らとの人工知能（AI）技術を臨床研究に応用した共同研究により、急性肝障害患者は治療効果（治療反応性）により3つの集団に分類できることを新たに発見しました。さらに、初診時の血液検査などの臨床情報を用いることにより、患者がどの集団に属するのかを予測するAIモデルの開発に世界で初めて成功しました。 詳細は関連リンクより九州大学のホームページをご覧ください。
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2025-02-06
今週の論文Week 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: 2502.03107 Title: Renormalization-group approach to the Kohn-Luttinger superconductivity: Amplification of the pairing gap from \ell^4 to \ell Author: Yuki Fujimoto arXiv: 2502.01169 Title: NJ/ψ and Nη_c interactions from lattice QCD Author: Yan Lyu, Takumi Doi, Tetsuo Hatsuda, Takuya Sugiura arXiv: 2502.00054 Title: Identification of finite circular metric spaces by magnitude and Riesz energy Author: Hiroki Kodama, Jun O'Hara arXiv: 2408.06091 Title: Computing theta-dependent mass spectrum of the 2-flavor Schwinger model in the Hamiltonian formalism Author: Akira Matsumoto, Etsuko Itou, Yuya Tanizaki arXiv: 2501.18960 Title: Novel Lattice Formulation of 2D Chiral Gauge Theory via Bosonization Author: Okuto Morikawa, Soma Onoda, Hiroshi Suzuki arXiv: 2501.18949 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: 2501.18171
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2025-01-31
セミナーレポート
Quantum 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
今週の論文Week 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: 2501.17423 Title: Multi-Messenger and Cosmological Constraints on Dark Matter through Two-Fluid Neutron Star Modeling Author: Ankit Kumar, Sudhakantha Girmohanta, Hajime Sotani arXiv: 2501.16829 Title: Left-hand cut and the HAL QCD method Author: Sinya Aoki, Takumi Doi, Yan Lyu arXiv: 2501.16804 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: 2501.15810 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: 2501.14086 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: 2501.14545
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2025-01-29
プレスリリース
Make it worth Weyl: engineering the first semimetallic Weyl quantum crystal
An international research team, including Ching-Kai Chiu (Senior Research Scientist, iTHEMS) and led by the Strong Correlation Quantum Transport Laboratory of the RIKEN Center for Emergent Matter Science (CEMS) has achieved a world-first by realizing an ideal Weyl semimetal, marking a major breakthrough in quantum materials research. Weyl fermions emerge as quantum excitations of electrons in crystals and are predicted to exhibit exotic electromagnetic properties. However, previous Weyl materials were often overshadowed by unwanted electronic states, making it difficult to observe pure Weyl fermion behavior. The team successfully engineered an ideal Weyl semimetal by precisely controlling the composition of the topological semiconductor (Cr,Bi)2Te3, eliminating irrelevant electronic states. Published in Nature, this work opens new possibilities for terahertz (THz) light devices and next-generation electronics. For more details, please refer to the related link.
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2025-01-28
受賞情報
Lingxiao Wang received the “Best ‘Physics for AI’ Paper Award”
Our colleague Lingxiao Wang (Research Scientist, iTHEMS) has received the “Best ‘Physics for AI’ Paper Award” of the Machine Learning and the Physical Sciences Workshop. The winning paper is entitled “Higher-order cumulants in diffusion models”. Congratulations, Lingxiao!
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2025-01-24
ホットトピック
Farewell message from Liang Zhang
Our colleague, Liang Zhang, has returned to the Shanghai Institute of Applied Physics at the University of Chinese Academy of Sciences to complete his PhD thesis. We will all miss him and wish him the very best of luck in successfully defending his thesis ! Here is a message from Liang Zhang: I joined iTHEMS in January 2023 as a joint student and completed my two-year journey here in January 2025. I initially joined iTHEMS to study lattice QCD and the HAL QCD method, and I am deeply grateful to Hatsuda-san and Doi-san for guiding me into this fascinating field. However, I soon realized that my experience at iTHEMS extended far beyond my original purpose. For example I had a discussion with Namba san on chiral symmetry breaking which is studied in both particle physics and cosmology. It left an immediate impression that physics is so universal other than reading such sentences in textbooks. And the interdisciplinary energy at iTHEMS constantly amazed me. When I first came here I always struggled to pinpoint people’s major. In some seminars, theoretical physicists gave a biology talk (like Christy)! I vaguely feel like there is a group theory for nature which can be expressed to different representations, biological, mathematical, physical, etc. Is this what the “i” in iTHEMS means? At last I would like to thank everyone in iTHEMS again for my two-year experience here. This experience gives me a great impulse to expand the possibilities of my future research life. iTHEMS’s uniqueness lies in its boundless possibilities. And I dearly hope our paths will cross again!
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2025-01-23
今週の論文Week 4, January 2025
Title: Numerical simulation of fractional topological charge in SU(N) gauge theory coupled with \mathbb{Z}_N 2-form gauge fields Author: Motokazu Abe, Okuto Morikawa arXiv: 2501.11438 Title: On the connected sums of the (2,1)-cable of the figure eight knot Author: Yoshihiro Fukumoto, Masaki Taniguchi arXiv: 2501.07910 Title: Lifetime measurement of the muonic atom of enriched Si isotopes Author: R. Mizuno, M. Niikura, S. Akamatsu, T. Fujiie, K. Ishida, T. Ito, T. Kikuchi, T. Matsuzaki, F. Minato, J. Murata, T. Naito, K. Shimomura, S. Takeshita, I. Umegaki, Y. Yamaguchi arXiv: 2501.05897 Title: On the slice-torus invariant q_M from \mathbb{Z}_2-equivariant Seiberg--Witten Floer cohomology Author: Nobuo Iida, Taketo Sano, Kouki Sato, Masaki Taniguchi arXiv: 2501.07788 Title: Tridiagonal Hamiltonians modeling the density of states of the Double-Scaled SYK model Author: Pratik Nandy Journal Reference: JHEP 01 (2025) 072 doi: https://doi.org/10.1007/JHEP01(2025)072 arXiv: 2410.07847
57件のニュース / 2025年