ニュース
72件のニュース / 2026年
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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
ホットトピック
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.
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2026-04-30
今週の論文Week 5, April 2026
Title: Chimera states on m-directed hypergraphs Author: Rommel Tchinda Djeudjo, Timoteo Carletti, Hiroya Nakao, Riccardo Muolo doi: https://doi.org/10.1103/j1zm-98yt arXiv: http://arxiv.org/abs/2506.12511v5
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2026-04-27
受賞情報
濱崎立資 上級研究員が令和8年度 文部科学大臣表彰 若手科学者賞を受賞
iTHEMSの濱崎立資 上級研究員（本務：理化学研究所 開拓研究本部 (CPR) 濱崎非平衡量子統計力学理研白眉研究チーム 理研白眉研究チームリーダー）が、令和8年度 科学技術分野の文部科学大臣表彰「若手科学者賞」を受賞しました。 本賞は、科学技術分野において優れた研究業績を挙げた若手研究者に贈られるものです。濱崎上級研究員は、「非平衡量子多体系の普遍性と新奇相に関する研究」により受賞しました。
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2026-04-23
今週の論文Week 4, April 2026
Title: Interaction between nuclear clusters and superfluid phonons in the neutron-star inner crust Author: Masayuki Matsuo, Arata Nishiwaki, Toshiyuki Okihashi, Masaru Hongo arXiv: http://arxiv.org/abs/2604.20725v1 Title: Complex scaling approach to quasinormal modes of Schwarzschild and Reissner--Nordström black holes Author: Shoya Ogawa, Takuya Hirose, Okuto Morikawa arXiv: http://arxiv.org/abs/2604.20442v1 Title: Understanding supernova gravitational waves with protoneutron star asteroseismology Author: Hajime Sotani arXiv: http://arxiv.org/abs/2604.19557v1 Title: Merger rate of initially clustered primordial black holes for the two-body channel Author: Kentaro Kasai, Masahiro Kawasaki, Kai Murai, Shunsuke Neda arXiv: http://arxiv.org/abs/2604.19316v1 Title: A unified framework for efficient quantum simulation of nonlinear spectroscopy Author: Long Xiong, Xiaoyang Wang, Xiaoxia Cai, Xiao Yuan arXiv: http://arxiv.org/abs/2604.16164v1 Title: PSMC-FAC: Automated Optimization of False-Negative Rate Corrections for Low-Coverage PSMC-Based Demographic Inference Author: Francisco Iglesias-Santos, Alba Nieto, Sònia Casillas, Antonio Barbadilla, Carlos Sarabia Journal Reference: Biology 2026, 15(8), 631 doi: https://doi.org/10.3390/biology15080631
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2026-04-23
ホットトピック
The third RIKEN Quantum internal meeting on March 30, 2026
On Monday, March 30, the third RIKEN Quantum internal meeting was held in the Large Conference Room (2F, Administrative Headquarters) at RIKEN, Wako, attended by a total of over 50 RIKEN Quantum members and related researchers. At this meeting, Yahui Chai and Danny Jammooa, who were invited from overseas, gave presentations on their recent research, 'Quantum Simulation of Particle Scattering' and 'Parametric Matrix Models,' respectively. Furthermore, Jian Xu, who recently joined RIKEN Quantum, presented the research he plans to pursue at the institute. In addition, 12 researchers from various fields associated with RIKEN Quantum, who also serve as RIKEN TRIP visiting scientists for collaborative projects, gave short talks to introduce their work. At the banquet following the meeting, members, including those meeting for the first time, exchanged ideas in a relaxed atmosphere, leading to fruitful discussions for the further development of RIKEN Quantum. Reported by Shinichiro Fujii
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2026-04-21
受賞情報
Keiya Hirashima received FY2025 RIKEN Research and Technology Incentive Award (RIKEN OHBU Award 理研桜舞賞)
Keiya Hirashima (Special Postdoctoral Researcher, iTHEMS) has been awarded the FY2025 RIKEN Research and Technology Incentive Award (RIKEN OHBU Award). The RIKEN OHBU Award is presented to early-career researchers and staff members at RIKEN who have demonstrated outstanding achievements in research and development, research support, or contributions to the promotion and dissemination of research outcomes, through active research activities. Hirashima was recognized for his work entitled “Establishment of galaxy simulations resolving individual stars through the integration of AI surrogate models and large-scale parallel computing.” This work integrates advanced AI surrogate modeling with large-scale parallel computation to enable high-resolution galaxy simulations that resolve individual stars, contributing to a deeper understanding of galaxy formation and evolution. Congratulations, Keiya!
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2026-04-21
受賞情報
Masazumi Honda received FY2025 RIKEN Excellent Achievement Award (RIKEN BAIHO Award 理研梅峰賞)
Masazumi Honda (Senior Research Scientist, iTHEMS) has been awarded the FY2025 RIKEN Excellent Achievement Award (RIKEN BAIHO Award). The RIKEN BAIHO Award is presented by the President of RIKEN to individuals who have achieved original and outstanding research and development results that are expected to receive high recognition in academic communities, or who have made distinguished contributions to research support both within and outside the institute. Honda was recognized for his work entitled “Development of non-perturbative methods in quantum field theory and quantum gravity.” This work develops novel theoretical approaches to analyze strongly coupled phenomena in quantum field theory and quantum gravity, and is expected to contribute to the advancement of fundamental physics through a deeper understanding of non-perturbative dynamics. Congratulations, Masazumi!
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2026-04-21
受賞情報
シュパイデル玲雄 理研ECLユニットリーダーが「SMBE Early-Career Excellence Award」を受賞
iTHEMS 数理基礎部門 数理遺伝学理研ECL研究ユニットのシュパイデル玲雄 理研ECLユニットリーダーは、2026年3月12日、「2026 SMBE Early-Career Excellence Award」を受賞しました。 本賞は、分子生物学・進化学分野の国際学会SMBEが、革新的な研究を通じて分野の発展に貢献し、教育やアウトリーチなどの活動において学会の理念を体現している研究者に授与するものです。 シュパイデルユニットリーダーは、数理的手法を用いた遺伝情報解析の研究を進め、分子進化や集団遺伝学の分野に新たな知見をもたらしてきました。今回の受賞は、こうした研究の成果と分野への貢献が評価されたものです。
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2026-04-16
今週の論文Week 3, April 2026
Title: Generalised (bi-)Hamiltonian structures of hydrodynamic type and (bi-)flat F-manifolds Author: Paolo Lorenzoni, Zhe Wang arXiv: http://arxiv.org/abs/2604.12819v1 Title: Interaction-powered Type Ibn Supernovae as a Transient PeVatron Candidate: The Case of SN 2023uqf Author: Ryo Sawada, Yusuke Inoue, Yosuke Ashida arXiv: http://arxiv.org/abs/2604.12496v1 Title: Exact SL(2,Z)-Structure of Lattice Maxwell Theory with $θ$-term in Modified Villain Formulation Author: Shoto Aoki, Yoshio Kikukawa, Toshinari Takemoto arXiv: http://arxiv.org/abs/2604.08736v1
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2026-04-10
ホットトピック
東京都現代美術館でトークイベント「Useless Science & Art」を開催
東京都現代美術館「ミッション∞インフィニティ」展の関連プログラムとして2026年3月21日（土）にトークイベント「Useless Science & Art 〜“役に立たない”科学とアートの有用性〜」が開催され、119名が参加しました。本イベントは、2025年8月14日～20に大阪・関西万博 EXPOメッセ「WASSE」で開催された「エンタングル・モーメント［量子・海・宇宙］×芸術」（延べ入場者数約6万人）に続いて、企画されたものです。 本イベントでは、その流れを引き継ぎ、iTHEMS研究者とアーティストが登壇。「一見役に立たない」科学研究やアート表現の価値について議論が行われました。量子ブラックホール理論に着想を得た作品《Black Hole Recorder》を起点に、科学と創造性の関係について多角的な視点が共有されました。 また、来場者からは多くの質問が寄せられ、科学とアートの関係性や価値の捉え方について活発な意見交換が行われるなど、会場は大いに盛り上がりました。本イベントは、万博を契機とした科学とアートの融合の流れをさらに発展させ、長期的視点での知のあり方を考える貴重な機会となりました。 Useless Prototyping Studio《Black Hole Recorder》の展示を含む東京都現代美術館「ミッション∞インフィニティ｜宇宙＋量子＋芸術」展は、2026年5月6日（水・祝）まで開催中です。
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2026-04-09
受賞情報
澤田涼 基礎特別研究員が宇核連若手奨励賞を受賞
理化学研究所 数理創造研究センター（iTHEMS） 基礎特別研究員の澤田涼氏が、第2回宇宙核物理連絡協議会（宇核連）若手奨励賞の受賞者に2026年3月31日付で選ばれました。 今回の受賞対象となった研究は、過去の超新星に起因する宇宙線環境が地球型惑星の形成に与える影響に関するものです [1]。
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2026-04-09
受賞情報
土肥明 基礎科学特別研究員が宇核連若手奨励賞を受賞
理化学研究所 開拓研究所 基礎科学特別研究員の土肥明氏（iTHEMS 兼務）が、第2回宇宙核物理連絡協議会（宇核連）若手奨励賞の受賞者に2026年3月31日付で選ばれました。 今回の受賞対象となった論文は、クロックバースターの理論研究に関するものです[1]。また、本研究成果は、2023年11月11日に理化学研究所 開拓研究所 玉川高エネルギー宇宙物理研究室が主導して打ち上げた、世界初の超小型汎用X線衛星 NinjaSat による初期の科学成果でもあります。これについての詳細は、関連リンクより理化学研究所 開拓研究所のプレスリリースをご覧ください。
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2026-04-09
今週の論文Week 2, April 2026
Title: Twisted doughnuts: Thick disk torus around equatorial asymmetric black hole Author: Che-Yu Chen, Eva Hackmann, Audrey Trova arXiv: http://arxiv.org/abs/2604.05604v1 Title: Gauss law codes and vacuum codes from lattice gauge theories Author: Javier P. Lacambra, Aidan Chatwin-Davies, Masazumi Honda, Philipp A. Hoehn arXiv: http://arxiv.org/abs/2604.06087v1 Title: Reconstruction of fast-rotating neutron star observables with the neural network Author: Wen Liu, Lingxiao Wang, Zhenyu Zhu arXiv: http://arxiv.org/abs/2604.05428v1 Title: Electroweak Doublet Dark Matter for a Galactic Halo Gamma-Ray Excess Author: Yasunori Nomura, Tomonori Totani arXiv: http://arxiv.org/abs/2604.05016v1 Title: Cosmological collider signals of modular spontaneous CP breaking Author: Shuntaro Aoki, Alessandro Strumia arXiv: http://arxiv.org/abs/2604.05548v1 Title: Mechanochemical instabilities drive digit morphogenesis in organoids Author: Rio Tsutsumi, Antoine Diez, Steffen Plunder, Ryuichi Kimura, Shinya Oki, Kaori Takizawa, Rei Nakano, Haruhiko Akiyama, Ritsuko Takada, Shinji Takada, Marco Musy, James Sharpe, Mototsugu Eiraku doi: https://doi.org/10.1101/2025.08.31.673315 Title: Multi-field oscillons/I-balls in the Friedberg-Lee-Sirlin model Author: Kai Murai, Tatsuya Ogawa, Fuminobu Takahashi arXiv: http://arxiv.org/abs/2604.04494v1 Title: Exponentially Long Evaporation of Noncommutative Black Hole Author: Pei-Ming Ho, Wei-Hsiang Shao, Takuya Yoda arXiv: http://arxiv.org/abs/2604.04774v1 Title: Type-IV 't Hooft Anomalies on the Lattice: Emergent Higher-Categorical Symmetries and Applications to LSM Systems Author: Tsubasa Oishi, Hiromi Ebisu arXiv: http://arxiv.org/abs/2604.02856v1 Title: Continuous-time evolution via probabilistic angle interpolation and its applications Author: Tomoya Hayata, Yuta Kikuchi arXiv: http://arxiv.org/abs/2604.02854v1 Title: Phase transitions in parametrized quantum circuits Author: Xiaoyang Wang, Han Xu, Lukas Broers, Tomonori Shirakawa, Seiji Yunoki arXiv: http://arxiv.org/abs/2603.27532v1 Title: Angular momentum transport in the convection zone of a 3D MHD simulation of a rapidly rotating core-collapse progenitor Author: Ryota Shimada, Lucy O. McNeill, Vishnu Varma, Keiichi Maeda, Takaaki Yokoyama, Bernhard Müller arXiv: http://arxiv.org/abs/2603.26550v1 Title: Cosmology from asymptotically safe Proca theories Author: Carlos Pastor-Marcos, Lavinia Heisenberg, Álvaro Pastor-Gutiérrez, Jan M. Pawlowski, Manuel Reichert arXiv: http://arxiv.org/abs/2604.01090v1 Title: Lindbladian Simulation with Commutator Bounds Author: Xinzhao Wang, Shuo Zhou, Xiaoyang Wang, Yi-Cong Zheng, Shengyu Zhang, Tongyang Li arXiv: http://arxiv.org/abs/2603.28602v1 Title: Disentangling the interactive effects of anthropogenic disturbances on biodiversity Author: Isaac Planas-Sitjà, Ryosuke Iritani, Adam L. Cronin arXiv: http://arxiv.org/abs/2603.29116v1 Title: Gravitational waves from gaps of neutron stars Author: Akira Dohi, Asuka Ito, Shota Kisaka arXiv: http://arxiv.org/abs/2603.29514v1 Title: Universal Non-Gaussian Signatures from Transient Instabilities Author: Shuntaro Aoki, Diederik Roest, Denis Werth arXiv: http://arxiv.org/abs/2604.01035v1 Title: Evaluating Phylogenetic Comparative Methods under Reticulate Evolutionary Scenarios Author: Lydia Morley, Emma Lehmberg, Sungsik Kong arXiv: http://arxiv.org/abs/2603.25986v1 Title: Segmentation of monotone data by Kobayashi-Warren-Carter type total variation energies Author: Yoshikazu Giga, Ayato Kubo, Hirotoshi Kuroda, Koya Sakakibara arXiv: http://arxiv.org/abs/2603.28078v2 Title: Zeta Zeros in a Narrow Vertical Box Author: Daniel A. Goldston, Ade Irma Suriajaya arXiv: http://arxiv.org/abs/2603.28104v1 Title: Finite-nuclear-size effect for hydrogenlike ions under high external pressure Author: Dengshan Liu, Huihui Xie, Pengxiang Du, Tianshuai Shang, Jian Li, Jiguang Li, Tomoya Naito arXiv: http://arxiv.org/abs/2603.22901v1
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2026-04-06
今週の注目人物
Self-introduction: Yuta Hamada
I am interested in particle physics such as string theory and early universe cosmology. Recently, I am working on identifying consistent gravitational effective field theories that can be ultraviolet completed. Additionally, I am interested in applying AI and quantum computing to string theory and quantum field theory.
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2026-04-02
ホットトピック
KEK-iTHEMS Workshop “Concepts of Quantum and Spacetime” on March 9, 2026
We held the workshop “Concepts of Quantum and Spacetime” (at KEK in Japan from 9 to 12 March 2026), a joint workshop organized by KEK Theory Center and RIKEN iTHEMS. The two fundamental questions, “What is quantum?” and “What is spacetime?”, are deeply intertwined. The workshop discussed the question “How can quantum theory and spacetime be understood in a consistent manner?” from a fundamental and broad perspective and shared various ideas with open minds, to find directions guiding quantum theory over the next 100 years. The topics were diverse: foundations of quantum theory, quantum gravity, emergence of spacetime, formulation of semi-classical gravity, experimental aspects of fundamental properties in nature, and foundations of quantum many-body systems and thermodynamics. Around 90 researchers from various countries, generations, and fields came together. (Around 40% of these were from overseas.) The 14 keynote speakers—many of whom are rarely seen in Japan—shared their visions on quantum theory and spacetime. (The talk slides are available in the website.) The 13 selected short talks and the 22 poster presentations were of a high standard, leading to lively discussions; we also held a poster award competition. Interestingly, the disagreements and confusion arising from differences in their expertise and viewpoints actually gave rise to new discussions and ideas. This was likely due to the open atmosphere of sincere engagement that emerged because the thema was not confined to specific methods or theoretical frameworks. Furthermore, small yet significant touches—such as providing boxed lunches to keep the lively atmosphere of the lecture hall going during the lunch break, and setting up whiteboards in open spaces to encourage discussion—proved effective. These efforts fostered constant, natural interaction and lively discussion throughout the venue. Participants did not merely listen; they truly shaped the workshop. (Visit the website to see photos during the event.) Many participants commented that it was an interesting and wonderful workshop. We also received feedback such as, “I gained ideas for future research,” and “This provided valuable insights for organizing future workshops.” These are the result of the deep curiosity shared by all participants regarding fundamental questions, “What is quantum?” and “What is spacetime?” It is precisely such curiosity that will naturally give rise to new ideas and collaborative research and connect the world. I hope that workshops embodying a similar spirit will be held around the world on a variety of themes in the future. Reported by Yuki Yokokura, chair of organizing committee.
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2026-04-02
今週の論文Week 1, April 2026
Title: Nonlocal operators on the lattice for the Higgs-confinement phase transition Author: Yusuke Shimada, Arata Yamamoto Journal Reference: J.Subatomic Part.Cosmol. 5, 100267 (2026) doi: https://doi.org/10.1016/j.jspc.2025.100267 Title: The 'Forgotten' Neutrons: Implications for the Propagation of High-Energy Cosmic Rays in Magnetized Astrophysical and Cosmological Structures Author: Ellis R. Owen, Kinwah Wu, Yoshiyuki Inoue, Tatsuki Fujiwara, Qin Han, Hayden P. H. Ng arXiv: http://arxiv.org/abs/2603.25060v1 Title: Josephson effects in an interaction-asymmetric junction across the BCS-BEC crossover Author: Tingyu Zhang, Hiroyuki Tajima arXiv: http://arxiv.org/abs/2603.25577v1
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2026-04-02
今週の注目人物
Self-introduction: Muzi Hong
I am doing research in cosmology, especially in early universe physics. Recently, I have been working on topics such as inflation, cosmological perturbations, baryogenesis, and dark energy. Cosmology is an interdisciplinary field, and I look forward to discussing various topics in physics with researchers from other fields.
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2026-04-02
プレスリリース
量子コンピュータで磁化の規則的振動を観測 －133量子ビットの2次元系で実証した量子有用性－
白川 知功 上級研究員を含む研究グループは、IBMの超伝導量子コンピュータを用いて、133量子ビットの2次元格子上で離散時間結晶および離散時間準結晶が最大100時間ステップ（時間ステップは駆動1周期を１ステップと数えた回数）にわたって安定して実現することを明らかにしました。 本研究成果は、古典計算が困難な2次元非平衡量子多体系のデジタル量子シミュレーションに向けた実機検証に貢献すると期待されます。 詳細は関連リンクをご覧下さい。
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2026-04-01
受賞情報
Yuta Sekino received FY2025 RIKEN Research and Technology Incentive Award (RIKEN OHBU Award 理研桜舞賞)
Yuta Sekino (Postdoctoral Researcher, iTHEMS) has been awarded the FY2025 RIKEN Research and Technology Incentive Award (RIKEN OHBU Award). The RIKEN Ohbu Award is presented to early-career researchers and staff members at RIKEN who have demonstrated outstanding achievements in research and development, research support, or contributions to the promotion and dissemination of research outcomes, through active research activities. Sekino was recognized for his proposal entitled “Quantum simulation of spin transport using ultracold atomic gases.” This work presents a novel theoretical framework for simulating and understanding spin transport phenomena in quantum many-body systems using ultracold atom platforms, and is expected to contribute to the advancement of quantum simulation and quantum condensed matter physics. Congratulations, Yuta!
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2026-03-31
ホットトピック
Farewell message from Takashi Satomi
Our colleague, Takashi Satomi, will be joining Tokyo Denki University as a Lecturer starting April 2026. We will all miss him and wish him the best of luck in this new endeavor. Here is a message from Takashi: I would like to share that I will be leaving my position as an SPDR at iTHEMS. Although my term was originally planned to continue, I have decided to end it early as I will start a new position as a lecturer at Tokyo Denki University from April. I have been a member of iTHEMS as an SPDR from April 2024 to March 2026. During this time, I greatly enjoyed the open and interdisciplinary environment. Discussions with researchers from different fields gave me many new ideas and perspectives, and these experiences have been very valuable for my research. I would like to express my sincere thanks to all the members at iTHEMS for their support and kindness. From April, I will continue to be affiliated with iTHEMS as a visiting researcher. I hope to continue discussions and collaborations in the future. Thank you very much for everything.
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2026-03-31
ホットトピック
Farewell message from Ryosuke Iritani
Our colleague, Ryosuke Iritani, will be joining the Graduate School of Science, The University of Tokyo, as a Project Associate Professor starting April 1, 2026. We will all miss him and wish him the best of luck in this new endeavor. Here is a message from Ryosuke: I have spent a rewarding seven years at iTHEMS. My research interests and vision have broadened significantly thanks to the research environment here. Since joining iTHEMS in 2019, I have become increasingly interested in learning and applying mathematics to biological questions. Whenever I encounter new mathematical techniques, I naturally consider how they might be applied to biological systems and how they can bridge our fields. Through this process, I have come to appreciate the truly interdisciplinary nature of science. This shift in my mindset was made possible by the opportunity to interact with such a diverse group of researchers. My goal over the next decade is to conduct biological research that also inspires other communities, such as mathematics and physics. I look forward to seeing where this path leads. The year 2020 was an unprecedented time, not only for iTHEMS but for society as a whole. During that period, we frequently discussed how to maintain an open and productive community, considering various ways to foster engagement within iTHEMS. As we move past the pandemic, I realize that navigating those challenges was an invaluable experience. It served as an important reminder that our research is fundamentally driven by human connection, passion, and well-being, and that we are individuals first and foremost. Finally, I would like to thank all the colleagues, technical staff, assistants, promotion office staff, and directors with whom I have been fortunate to work, discuss, chat, and dine. While I cannot list everyone by name here, I am deeply grateful for every interaction that enriched my time at iTHEMS. Special thanks to Adachi-san and Hamazaki-san for our continued collaboration; to Biology Seminar, Math Seminar, and Information Theory WG members for sharing their time and ideas through our daily interactions; to Catherine, Hatsuda-san, and Iso-san for their encouragement and for fostering such a great environment; and finally, to Wada-san for the continuous support in almost all aspects of my time at iTHEMS.
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2026-03-31
ホットトピック
Farewell message from Ryo Namba
Our colleague, Ryo Namba, will be joining the Department of Physics, Faculty of Science, Shizuoka University, as a Lecturer starting April 1, 2026. We will all miss him and wish him the best of luck in this new endeavor. Here is a message from Ryo: It has been an incredibly stimulating and encouraging five years since I joined iTHEMS in 2021. When I first arrived, restrictions due to COVID-19 limited how often we could come to the office, and I did not have many opportunities to meet other iTHEMS members in person. However, through online meetings and seminars, I sensed a strong and growing enthusiasm for intellectual exchange within the community. Once these constraints were relaxed, people naturally began to gather, and I had many valuable opportunities to interact with colleagues across a wide range of disciplines, including particle and nuclear physics, biology, and mathematics. It was during this time that I was able to expand my research directions significantly. I had the opportunity to participate in study camps with mathematicians and to organize a couple of intensive lecture series spanning physics and mathematics. These experiences have played a central role in shaping my current research focus. iTHEMS offers a truly unique research environment -- not only in its interdisciplinary nature, but also in its openness to member-driven initiatives such as workshops, seminars, and other academic activities. I am deeply grateful for my time at iTHEMS, and I look forward to building on these experiences in my research and educational aspects at Shizuoka University. I sincerely wish for the continued flourishing and development of iTHEMS, and for its current and future members to enjoy their own vibrant and productive time there.
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2026-03-31
ホットトピックFarewell message from Sotaro Sugishita
Our colleague, Sotaro Sugishita, will be joining Hokkaido University as an Associate Professor starting April 1st, 2026. We will all miss him and wish him the best of luck in this new endeavor. Here is a message from Sotaro: I joined iTHEMS in April 2025 as a research scientist in a cross-appointment position with Kyoto University. Although my time at iTHEMS has been short, I am very grateful for the opportunity to have been part of this unique and inspiring group. Due to my busy work and life in Kyoto, it is a little unfortunate that I did not have many opportunities to visit the Wako campus in person. Nevertheless, every time I visited, I was reminded of what a remarkable place iTHEMS is. There are so many outstanding researchers at iTHEMS, and each visit provided me with new stimulation. The open and interdisciplinary atmosphere of iTHEMS is truly special, and I feel fortunate to have had the experience. I would also like to express my sincere appreciation to the assistants at iTHEMS. Their support was always thoughtful and incredibly supportive, and it helped me greatly throughout. I am deeply grateful not only for the academic environment, but also for the professional and welcoming support system that makes iTHEMS such a pleasant place. I would like to thank everyone at iTHEMS. From April 2026, I will join Hokkaido University as an associate professor. I will also be affiliated with iTHEMS as a visiting researcher. I sincerely look forward to staying in touch and to future interactions and collaborations.
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2026-03-31
ホットトピック
Farewell message from Yuta Sekino
Our colleague, Yuta Sekino, will be joining the Institute for Advanced Research at Nagoya University as a YLC Assistant Professor starting April 1st, 2026. We will all miss him and wish him the best of luck in this new endeavor. Here is a message from Yuta: I have been at RIKEN for seven years. Starting this April, I will join the Institute for Advanced Research at Nagoya University as a YLC Assistant Professor. I first joined the Quantum Hadron Physics Laboratory (Hatsuda Lab.) at the Nishina Center in April 2019 as a JSPS fellow, and from that time I also began attending iTHEMS activities. In October 2021, I moved to the Astrophysical Big Bang Laboratory (Nagataki Lab.) at RIKEN Cluster for Pioneering Research and started a concurrent position in iTHEMS. In July 2024, I officially became a member of iTHEMS as a postdoctoral researcher associated with RIKEN Quantum, and a concurrent member in Hamzaki Hakubi Research Team. During my seven years at RIKEN, I have greatly enjoyed the research environment embracing the iTHEMS spirit of "under one roof." Since I was an undergraduate student, I have been interested in interdisciplinary studies because my main research field, cold atoms, is strongly influenced by other subfields of physics, such as solid-state, nuclear, and particle physics. Therefore, I have greatly enjoyed interactions with researchers not only in physics, but also in mathematics, biology, and data science. I have also appreciated the availability of quantum computing resources. Although I am moving to Nagoya University, I will remain affiliated as a visiting scientist. I would like to continue participating in iTHEMS activities, and I look forward to further interactions with everyone. Finally, I would like to express my sincere appreciation to all the researchers and assistants of iTHEMS for their kind support throughout my time at RIKEN.
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2026-03-31
ホットトピック
Farewell message from Shigenori Otsuka
Our colleague, Shigenori Otsuka, will be joining the Center for Environmental Remote Sensing, Chiba University, as an Associate Professor starting March 2026. We will all miss him and wish him the best of luck in this new endeavor. Here is a message from Shigenori: I came to RIKEN in January 2013 as a postdoctoral researcher at R-CCS, and I joined iTHEMS as a concurrent member in April 2018. Since then, I have learned a lot from various iTHEMS activities, such as the iTHEMS colloquium series, the lecture series at Nara Women's University, coffee meetings, and collaborations between iTHEMS and Kyoto University. Although my research field, meteorology, has not been a major topic within iTHEMS, I found that we shared many common interests, including fluid dynamics, chaos, data assimilation, and machine learning. After my 13-year career at RIKEN, I moved to Chiba University in March 2026 as an associate professor at the Center for Environmental Remote Sensing. In May 2026, I will return to iTHEMS as a visiting scientist in the Prediction Science Research Team, so please keep in touch. Thank you very much!
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2026-03-26
今週の論文Week 5, March 2026
Title: Solving Functional Renormalization Group Equations with Neural Networks Author: Yang-yang Tan, Wei-jie Fu, Lianyi He, Lingxiao Wang arXiv: http://arxiv.org/abs/2603.21151v1 Title: A robust method for classification of chimera states Author: S. Nirmala Jenifer, Riccardo Muolo, Paulsamy Muruganandam, Timoteo Carletti arXiv: http://arxiv.org/abs/2603.22026v1 Title: An introduction to monitored quantum systems and quantum trajectories: spectrum, typicality, and phases Author: Ryusuke Hamazaki, Ken Mochizuki, Hisanori Oshima, Yohei Fuji Journal Reference: Progress of Theoretical and Experimental Physics, ptag055 (2026) doi: https://doi.org/10.1093/ptep/ptag055 arXiv: http://arxiv.org/abs/2512.19922v2 Title: Confinement without symmetry breaking in chiral gauge theories Author: Haolin Li, Álvaro Pastor-Gutiérrez, Shahram Vatani arXiv: http://arxiv.org/abs/2603.19355v1
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2026-03-24
ホットトピック
Farewell message from Kan Kitamura
Our colleague, Kan Kitamura, will be joining the Department of Mathematics, College of Science, Rikkyo University as an Assistant Professor, starting April 1, 2026. We will all miss him and wish him the best of luck in this new endeavor. Here is a message from Kan Kitamura: I joined iTHEMS as a special postdoctoral researcher (SPDR) in April, 2024. It has been a great pleasure to spend these two years in such a wonderful research environment. This department is built on a unique concept where researchers from diverse fields of theoretical science work together under one roof. Being able to casually interact with colleagues from different areas has continually stimulated my intellectual curiosity and provided me with a lot of inspiration. In 2025, iTHEMS transitioned into a center, and I feel fortunate to have been there at that time. The evolving environment kept my research experience fresh and exciting. I feel that my research has progressed well during my time here, and I have no doubt that the creative atmosphere of iTHEMS played a significant role in this. I would like to express my deep gratitude to my colleagues for the discussions, both formal and informal, and to the staff for their support. Although I will be leaving my current position, I will remain affiliated as a visiting scientist, and I hope to continue interacting with all of you. I wish iTHEMS every success and continued growth.
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2026-03-19
今週の論文Week 4, March 2026
Title: Toward bootstrapping tensor-network contractions Author: Seishiro Ono, Yanbai Zhang, Hoi Chun Po arXiv: http://arxiv.org/abs/2603.17856v1 Title: Crowdsourcing Gravitational Waves from Superradiant Axions Author: Sebastian A. R. Ellis, Orion Ning, Nicholas L. Rodd, Jan Schütte-Engel arXiv: http://arxiv.org/abs/2603.15734v1 Title: TracktorLive: an integrated real-time object tracking and response system Author: Pranav Minasandra, Vivek Hari Sridhar, Dominique G Roche, Isaac Planas-Sitjà Journal Reference: bioRxiv 2026.03.12.711471 doi: https://doi.org/10.64898/2026.03.12.711471 Title: Learning Quantum Operator Dynamics from Short-Time Data Author: Jinyang Li, Satoshi Iso, Shunji Matsuura, Lingxiao Wang, Xiaoyang Wang arXiv: http://arxiv.org/abs/2603.14699v1 Title: A low mass and radius neutron star candidate in XTE J1810-189? Author: Shoutao Ban, Helei Liu, Zhaosheng Li, Yupeng Chen, Guoliang Lü, Akira Dohi, Tomoshi Takeda, Hongbin Fan, Chunhua Zhu, Renxin Xu arXiv: http://arxiv.org/abs/2603.12962v1 Title: $\bar{D}$-meson Nucleon Scattering from Lattice QCD at the Physical Point Author: Wren Yamada, Yan Lyu, Kotaro Murakami, Takumi Doi arXiv: http://arxiv.org/abs/2603.12251v1
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2026-03-17
受賞情報
小谷元子チームディレクターが日本学士院賞を受賞
理化学研究所 数理創造研究センター（iTHEMS）数理展開部門 数学応用研究チームの小谷元子チームディレクター（兼務）が、日本学士院賞の受賞者に選ばれました。今回の受賞は、砂田利一氏（明治大学名誉教授、東北大学名誉教授）との共同研究「対称性を持った無限グラフの離散幾何解析」を対象とするものとして、2026年3月12日付で日本学士院より公表されました。 授賞理由では、結晶格子の「標準的実現」という概念の導入、それに基づく結晶格子上のランダムウォークの研究、とりわけ中心極限定理や大偏差原理の確立、さらにK4クリスタルの再発見や物質科学への応用の推進などが高く評価されています。これらの成果は、離散幾何解析および離散代数幾何学の発展に、理論・応用の両面から重要な貢献をもたらしました。 本受賞の対象となった研究は、小谷チームディレクターが東北大学および東北大学材料科学高等研究所（WPI-AIMR）を拠点として進められた研究成果に基づくものです。iTHEMSは東北大学材料科学高等研究所（AIMR）とともに、2018年に連携拠点「SUURI-COOL (Sendai) AIMR-iTHEMS数理連携研究室」を設置しています。同研究室はAIMR本館3階に置かれ、数理科学の観点から物質・生命・宇宙の解明や社会における基本的な問題の解決を図ることを目的としています。 小谷チームディレクターのこのたびのご受賞を、iTHEMS一同、心よりお祝い申し上げます。
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2026-03-12
今週の論文Week 3, March 2026
Title: Effective theory of surface oscillations in self-bound superfluid droplets Author: Jun Mitsuhashi, Keisuke Fujii, Masaru Hongo arXiv: http://arxiv.org/abs/2603.10304v1 Title: Phase diagram of 4D SU(3) Yang-Mills theory at $θ=π$ via imaginary theta simulations Author: Akira Matsumoto, Mitsuaki Hirasawa, Jun Nishimura, Atis Yosprakob arXiv: http://arxiv.org/abs/2603.09604v1 Title: Rovibrational energy levels of H$_2$O by quantum computing Author: Erik Lötstedt, Tamás Szidarovszky arXiv: http://arxiv.org/abs/2603.05795v1 Title: Schwinger effect in QCD and nuclear physics Author: Hidetoshi Taya arXiv: http://arxiv.org/abs/2603.07847v1 Title: Bergman space, Conformally flat 2-disk operads and affine Heisenberg vertex algebra Author: Yuto Moriwaki arXiv: http://arxiv.org/abs/2603.06491v1 Title: Mean-Field Convective Phase Separation under Thermal Gradients Author: Meander Van den Brande, François Huveneers, Kyosuke Adachi arXiv: http://arxiv.org/abs/2603.06214v1 Title: When minor issues matter: symmetries, pluralism, and polarization in similarity-based opinion dynamics Author: Brian Mintz, Daniel Simonson, Dominik Wodarz, Feng Fu, Natalia L. Komarova arXiv: http://arxiv.org/abs/2603.04939v1
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2026-03-11
ホットトピック
RIKEN–Berkeley Workshop on Quantum Gravity 2025 on October 23-24, 2025
The RIKEN–Berkeley Workshop on Quantum Gravity 2025 was held on October 23–24, 2025, at the RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS), RIKEN Wako Campus, Japan. The workshop marked the first meeting of a new collaboration between the Leinweber Institute for Theoretical Physics (LITP) at the University of California, Berkeley and iTHEMS. A total of 38 participants attended the workshop. The workshop brought together researchers working on quantum gravity and related areas to discuss recent developments and future directions in the field. The scientific program featured talks on a range of topics, including quantum aspects of spacetime, black hole physics, holography, and their connections to quantum information and condensed matter physics. The meeting provided an opportunity for researchers from Berkeley, RIKEN, and other institutions to exchange ideas and explore potential collaborations. Discussions during the workshop highlighted current progress in the field and encouraged interactions among participants from different research backgrounds. The workshop served as the first step in strengthening collaboration between LITP and iTHEMS, with the aim of promoting continued exchanges and future joint research activities between the two institutions. The workshop was organized by Gabriele Di Ubaldo (LITP Berkeley and RIKEN iTHEMS), Tetsuo Hatsuda (RIKEN iTHEMS), Masazumi Honda (RIKEN iTHEMS), Satoshi Iso (RIKEN iTHEMS), Masamichi Miyaji (RIKEN iTHEMS), Shigehiro Nagataki (RIKEN iTHEMS) and Yasunori Nomura (LITP Berkeley and RIKEN iTHEMS). Reported by Masamichi Miyaji
72件のニュース / 2026年