ニュース
173件のニュース / 2025年
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2025-12-25
今週の論文Week 4, December 2025
Title: Universal relations between the quasinormal modes of neutron stars and magnetic tidal deformability Author: Hajime Sotani arXiv: http://arxiv.org/abs/2512.20867v1 Title: Electronic structure calculations and theoretical absorption spectra of I3− and I5− Author: Megumi Takahashi, Erik Lötstedt, Kaoru Yamanouchi Journal Reference: Chemical Physics Letters 885, 142608 (2026) doi: https://doi.org/10.1016/j.cplett.2025.142608 Title: Instability of parametrized black hole quasinormal modes in the high-overtone limit via the exact WKB analysis Author: Taiga Miyachi, Ryo Namba, Hidetoshi Omiya, Naritaka Oshita arXiv: http://arxiv.org/abs/2512.18631v1 Title: Collective dynamics of higher-order Vicsek model emerging from local conformity interactions Author: Iván León, Riccardo Muolo, Hiroya Nakao, Keisuke Taga arXiv: http://arxiv.org/abs/2512.19318v1 Title: Entanglement Dynamics by (Non-)Unitary Local Operator Quenches in a 2D Holographic CFT Author: Weibo Mao, Akihiro Miyata, Masahiro Nozaki, Farzad Omidi arXiv: http://arxiv.org/abs/2512.18781v1 Title: Achieving angular-momentum conservation with physics-informed neural networks in computational relativistic spin hydrodynamics Author: Hidefumi Matsuda, Koichi Hattori, Koichi Murase arXiv: http://arxiv.org/abs/2512.17971v1 Title: Quantum state of interacting primordial inhomogeneities: de-squeezing and decoherence Author: Amaury Micheli, Yuto Oshima, Tomo Takahashi arXiv: http://arxiv.org/abs/2512.17622v1 Title: Emergence of higher-order interactions in systems of coupled Kuramoto oscillators with time delay Author: Narumi Fujii, Keisuke Taga, Riccardo Muolo, Bob Rink, Hiroya Nakao arXiv: http://arxiv.org/abs/2512.16193v1
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2025-12-23
受賞情報
今野北斗 客員研究員が第22回（令和7年度）日本学術振興会賞を受賞
数理創造研究センター 数理基礎部門の今野北斗 客員研究員（東京大学 准教授）が、2025年12月16日に第22回（令和7（2025）年度）日本学術振興会賞を受賞しました。日本学術振興会賞は、創造性に富み優れた研究能力を有する若手研究者を早い段階で顕彰し、その研究意欲と研究の発展を支援することを目的として設けられた賞です。 今野客員研究員は、「族のゲージ理論と4次元トポロジーへの応用」に関する一連の研究業績が高く評価され、今回の受賞に至りました。本研究は、ゲージ理論と低次元トポロジーの深い関係を明らかにするものであり、数学分野における理論的発展に重要な貢献をなすものです。 授賞式は、2026年2月3日に日本学士院 講堂で開催される予定です。
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2025-12-18
今週の論文Week 3, December 2025
Title: Impact of experimental mass of $^{70}$Kr on the $^{68}$Se waiting-point in $rp$-process Author: Min Zhang, Yudong Luo, Akira Dohi, Xing Xu, Xinliang Yan, Toshitaka Kajino, Yuhu Zhang, Meng Wang arXiv: http://arxiv.org/abs/2512.14145v1 Title: Schrödinger Symmetry in Spherically-symmetric Static Mini-superspaces with Matter Fields Author: Taishi Sano, Yuki Yokokura arXiv: http://arxiv.org/abs/2512.13651v1 Title: Continuous Family of Conformal Field Theories and Exactly Marginal Operators Author: Shota Komatsu, Yuya Kusuki, Marco Meineri, Hirosi Ooguri arXiv: http://arxiv.org/abs/2512.11045v1 Title: Bridging dS/CFT and Celestial Holography via Ward-Takahashi Identities Author: Hideo Furugori, Naoki Ogawa, Sotaro Sugishita, Takahiro Waki arXiv: http://arxiv.org/abs/2512.10367v1 Title: Synchronization of Dirac-Bianconi driven oscillators Author: Riccardo Muolo, Iván León, Yuzuru Kato, Hiroya Nakao arXiv: http://arxiv.org/abs/2506.20163v2
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2025-12-12
ホットトピック
Computing n-Time Correlation Functions without Ancilla Qubits
A research team led by Xiaoyang Wang (Postdoctoral Researcher, Quantum Mathematical Science Team, iTHEMS) has proposed a new method for computing n-time correlation functions, which play a central role in understanding the dynamics of quantum many-body systems. The proposed approach requires neither ancilla qubits nor controlled operations, and evaluates correlation functions using only the unitary time evolution of the system of interest. Conventional methods, such as the Hadamard test, rely on ancilla qubits that control the entire system, posing significant challenges for digital quantum processors with limited qubit connectivity and for analog quantum simulators where controlled operations are difficult or impossible to implement. The present work overcomes these limitations and broadens the range of quantum platforms on which multi-time correlation functions can be experimentally accessed. The protocol was demonstrated on IBM quantum hardware with up to 12 qubits, where the team successfully measured the single-particle spectrum of the Schwinger model and the out-of-time-order correlator (OTOC) in the transverse-field Ising model. In addition, an error-mitigation strategy based on signal processing—combining signal filtering and correlation analysis—was introduced, enabling the recovery of ideal noiseless simulation results from noisy experimental data. This work provides a new foundation for experimentally probing complex quantum many-body correlation functions under realistic hardware constraints, thereby strengthening the connection between theoretical predictions and quantum experiments.
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2025-12-11
今週の論文Week 2, December 2025
Title: HoloNet: Toward a Unified Einstein-Maxwell-Dilaton Framework of QCD Author: Hong-An Zeng, Lingxiao Wang, Mei Huang arXiv: http://arxiv.org/abs/2512.06044v1 Title: Universal relation involving fundamental modes in two-fluid dark matter admixed neutron stars Author: Hajime Sotani, Ankit Kumar arXiv: http://arxiv.org/abs/2512.07105v1 Title: An Orbifold Framework for Classifying Layer Groups with an Application to Knitted Fabrics Author: Sonia Mahmoudi, Elizabeth J. Dresselhaus, Michael S. Dimitriyev arXiv: http://arxiv.org/abs/2512.05149v1
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2025-12-04
受賞情報
José Said Gutiérrez-Ortega 研究員が「第19回 Plant Species Biology 論文賞」を受賞しました
José Said Gutiérrez-Ortega 研究員が、第19回 Plant Species Biology 論文賞（Plant Species Biology Paper Award）を受賞しました。本研究は、奄美大島におけるソテツの生物文化遺産に対する脅威を多角的に解析した国際共同研究です。Plant Species Biology 論文賞は、同誌に掲載された論文の中から、編集委員会の投票により毎年 1～2 編が選ばれるものです。今年の受賞発表は 2025年11月18日 に行われ、授賞式は 2025年12月20日（土） に種生物学会の会合にて実施されます。
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2025-12-04
受賞情報
永井智哉コーディネーターが「第29回 異分野交流の夕べ ポスター賞」を受賞しました
永井智哉コーディネーターが、志田 あやか（TRIP事業推進部）、佐藤 桃子（IMS）、佐久間 弘子（広報部）とともに、第29回 異分野交流の夕べ ポスター賞を受賞しました。本ポスター賞は、異なる専門分野の研究者間の交流促進を目的とした「異分野交流の夕べ」において、59件のポスター発表の中から、特に優れた発表に贈られました。毎年5件程度が選出されます。 永井コーディネーターらの発表は、研究者によるプレスリリース作成の意識や実態を調査したもので、所内の研究職・事務職の方から大きなご関心をお寄せいただきました。調査にご回答くださった理研の研究者のみなさまに、この場を借りて御礼申し上げます。
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2025-12-04
今週の論文Week 1, December 2025
Title: Quantum Simulations of Opinion Dynamics Author: Xingyu Guo, Xiaoyang Wang, Lingxiao Wang arXiv: http://arxiv.org/abs/2512.03770v1 Title: Swarming by curvature control in arbitrary dimension Author: Pierre Degond, Antoine Diez, Amic Frouvelle arXiv: http://arxiv.org/abs/2512.02800v1 Title: Mass transfer stability for AM CVn binaries with white dwarf donors Author: Lucy O. McNeill, Ryosuke Hirai arXiv: http://arxiv.org/abs/2512.01377v1 Title: Storage capacity of perceptron with variable selection Author: Yingying Xu, Masayuki Ohzeki, Yoshiyuki Kabashima arXiv: http://arxiv.org/abs/2512.01861v1 Title: Imprints of flat space analyticity in de Sitter S-matrix Author: Jason Kristiano, Ryo Namba, Atsushi Naruko, Ryo Saito, Daisuke Yamauchi arXiv: http://arxiv.org/abs/2511.22623v1 Title: Speed of sound exceeding the conformal bound in dense QCD-like theories Author: Etsuko Itou, Kei Iida, Kotaro Murakami, Daiki Suenaga arXiv: http://arxiv.org/abs/2511.22878v1 Title: High-resolution cosmological simulations of primordial dark matter clustering under long-range and fractional forces Author: Derek Inman arXiv: http://arxiv.org/abs/2511.23040v1
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2025-12-01
今週の注目人物
Self-introduction: Kenji Okubo
I have been using evolutionary simulations of gene regulatory networks to explore how the rules of inheritance change over time. My work has addressed fundamental questions in biology, including the evolutionary meaning of sexual reproduction and why genetic rules such as dominance emerged. More recently, I have been investigating how organisms with additional sets of chromosomes (polyploids) evolved, as well as the evolutionary mechanisms underlying aging. I am also applying mathematical models beyond biology—to language change, statistical patterns in ancient Japanese tombs, and the spread of stone tools. Through this work, I aim to uncover shared mathematical structures that cut across very different fields. Currently, I am incorporating ideas from statistical physics into genetics, seeking new ways to understand gene sequences and evolutionary processes. Moving forward, I hope to use network science and mathematical modeling to reveal the hidden structures and principles that shape complex systems across disciplines.
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2025-11-27
今週の論文Week 5, November 2025
Title: Zeta Zeros on the Critical Line Author: Daniel A. Goldston, Ade Irma Suriajaya arXiv: http://arxiv.org/abs/2511.20059v1 Title: Closed-loop calculations of electronic structure on a quantum processor and a classical supercomputer at full scale Author: Tomonori Shirakawa, Javier Robledo-Moreno, Toshinari Itoko, Vinay Tripathi, Kento Ueda, Yukio Kawashima, Lukas Broers, William Kirby, Himadri Pathak, Hanhee Paik, Miwako Tsuji, Yuetsu Kodama, Mitsuhisa Sato, Constantinos Evangelinos, Seetharami Seelam, Robert Walkup, Seiji Yunoki, Mario Motta, Petar Jurcevic, Hiroshi Horii, Antonio Mezzacapo arXiv: http://arxiv.org/abs/2511.00224v1 Title: Elucidating Many-Body Effects in Molecular Core Spectra through Real-Time Approaches: Efficient Classical Approximations and a Quantum Perspective Author: Vibin Abraham, Priyabrata Senapati, Himadri Pathak, Bo Peng arXiv: http://arxiv.org/abs/2511.17985v1 Title: Fedder type criteria for quasi-$F$-splitting II Author: Tatsuro Kawakami, Teppei Takamatsu, Shou Yoshikawa arXiv: http://arxiv.org/abs/2511.17270v1 Title: Models toward understanding torpor–arousal cycles during hibernation Author: Gen Kurosawa Journal Reference: Canadian Journal of Zoology (2025) doi: https://doi.org/10.1139/cjz-2024-0187
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2025-11-20
今週の論文Week 4, November 2025
Title: Cluster phenomena using few-body and Lattice QCD theories Author: E. Hiyama, T. Doi arXiv: http://arxiv.org/abs/2511.14155v1 Title: Dynamical Tidal Response of Non-rotating Black Holes: Connecting the MST Formalism and Worldline EFT Author: Hajime Kobayashi, Shinji Mukohyama, Naritaka Oshita, Kazufumi Takahashi, Vicharit Yingcharoenrat arXiv: http://arxiv.org/abs/2511.12580v1 Title: Return of the Clocked Burster: Exceptionally Short Recurrence Time in GS 1826-238 Author: Tomoshi Takeda, Toru Tamagawa, Teruaki Enoto, Wataru Iwakiri, Akira Dohi, Tatehiro Mihara, Hiromitsu Takahashi, Chin-Ping Hu, Amira Aoyama, Naoyuki Ota, Satoko Iwata, Takuya Takahashi, Kaede Yamasaki, Takayuki Kita, Soma Tsuchiya, Yosuke Nakano, Mayu Ichibakase, Nobuya Nishimura Journal Reference: The Astrophysical Journal Letters, Volume 993, Number 1, L13 (2025) doi: https://doi.org/10.3847/2041-8213/ae0e75 arXiv: http://arxiv.org/abs/2508.18837v3 Title: Work distribution and fluctuation theorem in AdS/CFT Author: Daichi Takeda arXiv: http://arxiv.org/abs/2511.10305v1 Title: Modeling the Contact Surfaces Formed by Pebble Collisions: Application to Formation of Comet 67P/Churyumov--Gerasimenko Author: Misako Tatsuuma, Satoshi Okuzumi, Akimasa Kataoka, Hidekazu Tanaka arXiv: http://arxiv.org/abs/2511.09835v1
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2025-11-13
受賞情報小野 清志郎 客員研究員が日本物理学会若手奨励賞を受賞
小野 清志郎 iTHEMS客員研究員（東京大学 助教）が、日本物理学会が主催する「日本物理学会若手奨励賞（領域4）」を受賞しました。対象となった研究業績は「対称性指標によるトポロジカル超伝導相の分類」です。本賞は、将来の物理学を担う優秀な若手研究者を奨励する目的で、37歳以下の若手研究者に授与されるものです。小野客員研究員は、トポロジカル物質に関する独創的かつ先駆的な理論研究が高く評価されました。 おめでとうございます。
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2025-11-13
今週の論文Week 3, November 2025
Title: Chiral Anomaly of Kogut-Susskind Fermion in (3+1)-dimensional Hamiltonian formalism Author: Shoto Aoki, Yoshio Kikukawa, Toshinari Takemoto arXiv: http://arxiv.org/abs/2511.06198v1
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2025-11-12
ホットトピック
The 1st Joint General Meeting of RIKEN Quantum and the QII RIKEN User Group on October 24, 2025
On Friday, October 24, the 1st Joint General Meeting of RIKEN Quantum and the QII RIKEN User Group was held at Okochi Hall on the RIKEN Wako campus, bringing together RIKEN researchers who utilize the ibm_kawasaki quantum computer. The meeting featured lively discussions on quantum computing research at RIKEN across a wide range of disciplines, including condensed matter physics, particle, nuclear and astrophysics, biomedical sciences, and the humanities. With over 60 participants, including members from IBM Quantum, the event was a great success. This meeting is expected to further accelerate the development of quantum computing research at RIKEN in the future.
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2025-11-06
ホットトピック
超小型衛星 NinjaSatが異常に短いX線バースト周期を発見
土肥 明 基礎科学特別研究員を含む国際共同研究グループは、理研が主導するキューブサットX線衛星「NinjaSat（ニンジャサット）」を用いて、X線バーストを決まった時間間隔で起こすX線連星系（クロックバースター）を観測し、この天体の観測史上最も短い1.6時間のバースト繰り返し時間(再帰時間)を発見しました。 詳細は関連リンクをご覧下さい。
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2025-11-06
今週の論文Week 2, November 2025
Title: Bounded domains in the 3-dimensional space Author: Takashi Tsuboi arXiv: http://arxiv.org/abs/2511.01278v1 Title: Transmission Coefficients from Phantom Currents Author: Yuma Furuta, Yuya Kusuki, Toshiki Onagi arXiv: http://arxiv.org/abs/2511.00356v1 Title: Prime and semiprime Lie ideals in C*-algebras Author: Eusebio Gardella, Kan Kitamura, Hannes Thiel arXiv: http://arxiv.org/abs/2506.11819v1 Title: Preface of Special Feature “Current topics on cycad biology: Deciphering the Rosetta Stone of plant evolution.” Part II: Perspectives from natural history Author: José Said Gutiérrez-Ortega Journal Reference: Plant Species Biology doi: https://doi.org/10.1111/1442-1984.70032 Title: Classifying extended Higgs models through the trilinear Higgs boson coupling measurement at future colliders Author: Nagisa Hiroshima, Mitsuru Kakizaki, Shuhei Ohzawa arXiv: http://arxiv.org/abs/2510.27560v1 Title: One-pion exchange potential in a strong magnetic field Author: Daiki Miura, Masaru Hongo, Hidetoshi Taya, Tetsuo Hatsuda arXiv: http://arxiv.org/abs/2510.26544v1
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2025-11-04
今週の注目人物
Self-introduction: Riccardo Muolo
Hello! I'm interested in nonlinear dynamics on networks and higher-order structures, synchronization, Turing pattern formation, control of dynamical systems and mathematical modeling. My background is in nonlinear physics and applied mathematics. I studied in Italy (BSc and MSc)and Belgium (PhD). Before joining iTHEMS, I was a postdoc at Science Tokyo.
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2025-10-30
今週の論文Week 5, October 2025
Title: Self-supervised Synthetic Pretraining for Inference of Stellar Mass Embedded in Dense Gas Author: Keiya Hirashima, Shingo Nozaki, Naoto Harada arXiv: http://arxiv.org/abs/2510.24159v1 Title: The First Star-by-star $N$-body/Hydrodynamics Simulation of Our Galaxy Coupling with a Surrogate Model Author: Keiya Hirashima, Michiko S. Fujii, Takayuki R. Saitoh, Naoto Harada, Kentaro Nomura, Kohji Yoshikawa, Yutaka Hirai, Tetsuro Asano, Kana Moriwaki, Masaki Iwasawa, Takashi Okamoto, Junichiro Makino doi: https://doi.org/10.1145/3712285.3759866 arXiv: http://arxiv.org/abs/2510.23330v1 Title: Foundations of Carrollian Geometry Author: Luca Ciambelli, Puttarak Jai-akson arXiv: http://arxiv.org/abs/2510.21651v1
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2025-10-28
今週の注目人物
Self-introduction: Duc Truyen Le
Hi, I’m Truyen (チュエン), or you can call me Le (レ). I joined iTHEMS, RIKEN, in October 2025 under the IPA Doctoral Program. Before studying in Japan, I pursued my undergraduate studies in theoretical physics at Vietnam National University, followed by a Master’s degree in High Energy Physics at National Tsing Hua University. My passion lies in mathematical physics, particularly in applying mathematical tools to deepen our understanding of fundamental physics and other scientific domains. In the advent of rapid quantum computing development, I joined Professor Masazumi Honda’s lab, where I am working on quantum algorithms for quantum field theory. My research focuses on developing quantum algorithms for high-energy physics models and investigating phenomenological processes where classical approaches reach their limits. In the long term, I aim to extend these quantum methods to interdisciplinary applications across science. Beyond research, I enjoy board games, movies, sports, and exploring different cultures and histories. I am excited to exchange ideas with colleagues, broaden my perspective through cross-disciplinary learning, and contribute to this vibrant research community.
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2025-10-23
今週の論文Week 4, October 2025
Title: Krylov Complexity Under Hamiltonian Deformations and Toda Flows Author: Kazutaka Takahashi, Pratik Nandy, Adolfo del Campo arXiv: http://arxiv.org/abs/2510.19436v1 Title: The role of the secondary white dwarf in a double-degenerate double-detonation explosion, in the supernova remnant phase Author: Gilles Ferrand, Rüdiger Pakmor, Yusei Fujimaru, Shiu-Hang Lee, Samar Safi-Harb, Shigehiro Nagataki, Friedrich K. Roepke, Anne Decourchelle, Ivo R. Seitenzahl, Daniel Patnaude arXiv: http://arxiv.org/abs/2510.18800v1 Title: Modulated symmetries from generalized Lieb-Schultz-Mattis anomalies Author: Hiromi Ebisu, Bo Han, Weiguang Cao arXiv: http://arxiv.org/abs/2510.18689v1 Title: Functional renormalization group for classical liquids without recourse to hard-core reference systems: A study of three-dimensional Lennard-Jones liquids Author: Takeru Yokota, Jun Haruyama, Osamu Sugino arXiv: http://arxiv.org/abs/2510.16710v1 Title: Reviving, reproducing, and revisiting Axelrod's second tournament Author: Vincent Knight, Owen Campbell, Marc Harper, T. J. Gaffney, Nikoleta E. Glynatsi arXiv: http://arxiv.org/abs/2510.15438v1 Title: Absence of Majorana-Weyl fermions in $d=4$ and the theory of Majorana fermions Author: Kazuo Fujikawa arXiv: http://arxiv.org/abs/2510.14998v1
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2025-10-22
ホットトピック
白色矮星の“潮汐加熱”が明らかに
京都大学 白眉センター 特定助教／iTHEMS 客員研究員の Lucy Olivia McNeill さんを中心とする研究チームは、短周期連星系にある白色矮星（星の燃焼を終えた超高密度天体）が、強い潮汐力によって理論予測よりも高温・膨張していることを明らかにしました。 この「潮汐加熱」により、白色矮星は通常の約2倍に膨らみ、表面温度が1〜3万Kに達することが示されました。その結果、質量移転が始まる軌道周期は従来の予想よりも最大3倍長くなる可能性があるとされています。 本研究は、白色矮星の進化やIa型超新星の起源理解の深化に寄与する成果として注目されています。 詳細は、関連リンクより京都大学のプレスリリースページをご覧ください。
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2025-10-21
受賞情報
小澤知己客員研究員が「第15回フロンティアサロン永瀬賞 特別賞」を受賞
東北大学 材料科学高等研究所（WPI-AIMR）の小澤知己教授（iTHEMS客員研究員）が、一般財団法人フロンティアサロン財団より「第15回 フロンティアサロン永瀬賞 特別賞」を受賞しました。この賞は、将来のノーベル賞候補とも期待される若手研究者を顕彰し、未来を拓く科学技術分野での顕著な成果をたたえるものです。 小澤教授は、物質の性質やその振る舞いを理解する「物性物理学」分野で国際的に活躍する理論物理学者です。トポロジー（位相幾何学）という“形”に注目する数学的な考え方を応用し、金属や気体、光、音波、さらには生体構造など、さまざまな物理系に共通する法則を見出してきました。最近では、高次元トポロジーの理論的拡張を通じて光や電子の新しい量子状態の研究を進めており、これらの成果は量子コンピュータや次世代光デバイスなどへの応用が期待されています。 受賞を記念して、2025年9月26日には全国の高校生を対象とした「サイエンスセミナー」にて「トポロジーが拓く物理の地平 ～物質と次元を超えて～」と題した特別講義を行いました。講演では、トポロジーがもたらす“形の物理学”の魅力を紹介し、次世代を担う若い世代に科学の面白さを伝えました。
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2025-10-20
ホットトピック
AI分野における世界最高峰の国際会議「NeurIPS 2025」で論文採択
立教大学・増村翔氏と瀧雅人准教授（iTHEMS客員研究員）の論文が、機械学習分野の国際会議NeurIPS 2025に採択されました。 本研究では、連想記憶モデルの原理をTransformerに組み込むことで、学習過程で生じる「ランク崩壊」と呼ばれる問題を理論的・実験的に抑制できる新しい構造を提案しました。 追加パラメータを導入せずに性能を向上させることに成功しており、大規模言語モデルや画像生成AIのさらなる高性能化に貢献する可能性が期待されます。 NeurIPS 2025は2025年12月に米国サンディエゴで開催されます。 詳細は関連リンクより立教大学のプレスリリースをご覧下さい。
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2025-10-16
ホットトピック
大手前高校が「マスツアー」で iTHEMS を訪問しました
2025年10月2日〜3日にかけて、大阪府立大手前高等学校の生徒が理化学研究所数理創造研究センター（iTHEMS）を訪問し、「マスツアー」研修プログラムが実施されました。 生徒たちは iTHEMS の研究者による講義を通じて、数理科学の魅力と最先端の研究に触れました。田中章詞上級研究員による「機械学習入門」、入谷亮介上級研究員による「生物の増殖原理と進化ゲーム理論」、佐野岳人研究員による「球面と次元のはなし」といった多様な分野の講義が行われ、参加者は普段の授業では得られない刺激的な学びを体験しました。 生徒からは「進路を考える上で大変参考になった」「数学の新しい面白さを知った」といった感想が寄せられました。今回の訪問を通じて、数理科学への理解と関心を深める貴重な機会を提供することができました。
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2025-10-16
今週の論文Week 3, October 2025
Title: Revisiting the limits on dark matter annihilation cross-section and decay lifetime in light of electron and positron fluxes Author: Nagisa Hiroshima, Kazunori Kohri, Partha Kumar Paul, Narendra Sahu arXiv: http://arxiv.org/abs/2510.11700v1 Title: Exact WKB method for radial Schrödinger equation Author: Okuto Morikawa, Shoya Ogawa arXiv: http://arxiv.org/abs/2510.11766v1 Title: Cobordism maps in Khovanov homology and singular instanton homology II Author: Hayato Imori, Taketo Sano, Kouki Sato, Masaki Taniguchi arXiv: http://arxiv.org/abs/2510.09399v1 Title: Space-based cm/kg-scale Laser Interferometer for Quantum Gravity Author: Nobuyuki Matsumoto, Katsuta Sakai, Kosei Hatakeyama, Kiwamu Izumi, Daisuke Miki, Satoshi Iso, Akira Matsumura, Kazuhiro Yamamoto arXiv: http://arxiv.org/abs/2507.12899v2
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2025-10-15
セミナーレポート
ABBL-iTHEMS Joint Astro Seminar by Wick C. Haxton on September 30, 2025
Prof. Wick Haxton (UCB/LBNL) visited iTHEMS from September 29 to October 3, 2025. On September 30, Prof. Hatton delivered a seminar titled “A Continuous Galactic Line Source of Axions: The Remarkable Case of ²³Na” as part of the iTHEMS seminar series. The talk focused on a novel and intriguing mechanism involving the isotope sodium-23 (²³Na), which, under certain astrophysical conditions, can convert the thermal energy within stars into axions. As these axions travel through the intergalactic magnetic field, some convert into detectable gamma rays. As a result, future all-sky detectors such as COSI may be able to place new constraints on light axion-like particles. His research is highly interdisciplinary, bridging astrophysics, nuclear physics, and elementary particle physics. The seminar was well attended by many members of RIKEN including iTHEMS. Reported by Shigehiro Nagataki
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2025-10-14
リサーチニュース
RIKEN Research: Looking at black-hole oscillations through a mathematical lens
By applying a versatile mathematical technique to black holes, RIKEN cosmologists have uncovered new subtleties about how they vibrate. Black holes are some of the most intriguing objects in the Universe. Their gravitational pull is so strong that not even light can escape from their surfaces. Astronomers can only observe light produced indirectly by material falling into black holes. Since 2016, they have had another means of investigating black holes—gravitational waves. These are ripples created in the fabric of space–time through cataclysmic events such as the merger of two black holes. Immediately after merging, special oscillations known as quasi-normal modes are set up in the resulting black hole. “Quasi-normal modes are frequency modes that are generated when a black hole experiences some major disturbance,” explains Ryo Namba of the RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences. These vibrations emit gravitational waves after a merger. While the higher overtones of quasi-normal modes of such gravitational waves are too weak for today’s detectors, astrophysicists can study quasi-normal modes mathematically. To read more, please visit the related link.
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2025-10-09
今週の論文Week 2, October 2025
Title: Latent Representation Learning in Heavy-Ion Collisions with MaskPoint Transformer Author: Jing-Zong Zhang, Shuang Guo, Li-Lin Zhu, Lingxiao Wang, Guo-Liang Ma arXiv: http://arxiv.org/abs/2510.06691v1 Title: The first proper motion measurement of the acceleration regions in the large-scale jets of SS 433 powering the W50 nebula Author: Naomi Tsuji, Yoshiyuki Inoue, Dmitry Khangulyan, Kaya Mori, Samar Safi-Harb, Takaaki Tanaka, Laura Olivera-Nieto, Brydyn Mac Intyre, Kazuho Kayama, Takeshi Go Tsuru, Hiroyuki Uchida, Tatsuki Fujiwara, Felix Aharonian arXiv: http://arxiv.org/abs/2510.06431v1 Title: Relevant Deformations, Brane Brick Models and Triality Author: Mario Carcamo, Sebastian Franco, Dongwook Ghim, Georgios P. Goulas, Rak-Kyeong Seong arXiv: http://arxiv.org/abs/2510.05517v1 Title: Testing the arrow of time at the cosmo collider Author: Shuntaro Aoki, Alessandro Strumia arXiv: http://arxiv.org/abs/2510.05204v1 Title: At most 10 cylinders mutually touch: a Ramsey-theoretic approach Author: Travis Dillon, Junnosuke Koizumi, Sammy Luo arXiv: http://arxiv.org/abs/2510.03924v1 Title: Mean-field limits à la Tanaka and large deviations for particle systems with network interactions Author: Louis-Pierre Chaintron, Antoine Diez arXiv: http://arxiv.org/abs/2510.04894v1 Title: Combining complex Langevin dynamics with score-based and energy-based diffusion models Author: Gert Aarts, Diaa E. Habibi, Lingxiao Wang, Kai Zhou arXiv: http://arxiv.org/abs/2510.01328v1 Title: Shadow of black holes with consistent thermodynamics Author: Che-Yu Chen, Chiang-Mei Chen, Nobuyoshi Ohta arXiv: http://arxiv.org/abs/2510.00708v1 Title: Digital quantum simulation of many-body localization crossover in a disordered kicked Ising model Author: Tomoya Hayata, Kazuhiro Seki, Seiji Yunoki arXiv: http://arxiv.org/abs/2510.01983v1
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2025-10-09
受賞情報
三好建正チームディレクターが国立コルドバ大学より「名誉招聘者（Visitante Distinguido）」の称号を授与
2025年9月4日、理化学研究所 開拓研究本部 iTHEMSの三好建正チームディレクターが、アルゼンチンの国立コルドバ大学（Universidad Nacional de Córdoba）より「名誉招聘者（Visitante Distinguido）」の称号を授与されました。 本表彰は、三好チームディレクターがこれまでに果たしてきた気候防災分野への顕著な貢献を高く評価したものです。三好チームは、国際科学技術協力プログラム（SATREPS）の研究課題「PREVENIR（気象災害に脆弱な人口密集地域のための数値天気予報と防災情報提供システムのプロジェクト）」を主導し、都市型洪水の早期警戒システムの開発を進めています。 このプロジェクトでは、スーパーコンピュータ「京」や「富岳」で培われた最先端の数値シミュレーション技術やデータサイエンスを駆使し、アルゼンチンの大都市ブエノスアイレスおよびコルドバでの社会実装を目指しています。また、実践的な教育の場の提供を通じて、アルゼンチンをはじめとする国際的な協力体制の強化にも寄与しています。
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2025-10-08
研究・研究者紹介
一家に1枚「世界とつながる“数理”」 —すべての人になかに“数理”はある
鮮やかな色合いが目を引く、文部科学省「一家に1枚 世界とつながる”数理”」のポスター。その制作チームのメンバーである理化学研究所数理創造プログラム（iTHEMS）コーディネーター兼プログラムディレクター室室長の永井智哉さんとプランナー・科学コミュニケーターの島田卓也さんにお話をうかがいました。 記事全文は関連リンクからご覧ください。
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2025-10-06
今週の注目人物
Self-introduction: Yuya Murakami
My goal in life is to connect people through mathematics. Although mathematics is an accumulation of truths, with each step of my research I feel ever more strongly that doing mathematics is an endeavor made possible by human connections. For me, those connections are a true blessing. When I look at completed joint papers, I often think, “I could not have done this alone,” and in those moments I renew my gratitude for the people I have met. Through experiences like these, I naturally came to wish that I could connect people through mathematics. Through research, education, and outreach, I work every day to help connect people and, through those connections, to create new value for each person involved. My research aims are to understand the mysterious object called "quantum modular forms" and, through that lens, to deepen the ties among number theory, topology, mathematical physics, and representation theory. Quantum modular forms, introduced around 2010, are still young and full of mysteries. Their significance lies in their role as a bridge that can reveal deep structures linking these four fields. Focusing on this bridge—quantum modular forms—I work day by day to elucidate the relationships among these areas. As a number theorist, I cannot pursue this agenda alone. Many of my results to date have grown from collaborations with researchers specializing in topology. I will continue to build cross-disciplinary partnerships so that the work is meaningful for multiple communities. This research objective is aligned with my broader life goal of connecting people through mathematics, and I am committed to both. The environment at iTHEMS, where interaction with researchers from diverse disciplines is the norm, is ideal for achieving these goals. I am grateful for this setting and will continue to move this work forward.
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2025-10-02
受賞情報
儀保伸吾客員研究員が日本時間生物学会学術奨励賞を受賞
儀保伸吾客員研究員が2025年度(第23回)日本時間生物学会学術奨励賞を受賞しました。 受賞研究テーマは「時間波形に着目した体内時計と冬眠の理論研究」です。 理論研究のみでの受賞は今回が初めてです。 授賞式と受賞講演は2025年10月5日の第32回学術大会において行われる予定です。 おめでとうございます！
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2025-10-02
今週の論文Week 1, October 2025
Title: Vector Horndeski black holes in nonlinear electrodynamics Author: Che-Yu Chen, Antonio De Felice, Shinji Tsujikawa, Taishi Sano arXiv: http://arxiv.org/abs/2509.23134v1 Title: Regularized Lednicky-Lyuboshitz formula for higher-partial waves in femtoscopy Author: Koichi Murase, Tetsuo Hyodo arXiv: http://arxiv.org/abs/2509.22844v1 Title: The Courant-Hilbert construction in 4D Chern-Simons theory Author: Osamu Fukushima, Takaki Matsumoto, Kentaroh Yoshida arXiv: http://arxiv.org/abs/2509.22080v1 Title: A first characterization of the leaflet endophytic prokaryotic community in Dioon cycads Author: Gonzalo Contreras-Negrete, Antonio Hernández-López, Jimena Jazmín Hurtado-Olvera, Miguel Ángel Pérez-Farrera, José Said Gutiérrez-Ortega Journal Reference: Plant Species Biology doi: https://doi.org/10.1111/1442-1984.70029
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2025-10-01
ホットトピック
Farewell message from Tomoya Naito
Our colleague, Tomoya Naito, has left iTHEMS at the end of September 2025 to join the Department of Nuclear Engineering and Management, Graduate School of Engineering, The University of Tokyo as a Project Assistant Professor. We are grateful for his many contributions during his time with us and wish him every success in his new position. Here is a message from Tomoya: I first joined the Quantum Hadron Physics Laboratory (Hatsuda Lab.) at the Nishina Center in June 2017 as a student trainee, and from that time I also began attending iTHEMS activities. In April 2022, I officially became a member of iTHEMS as an SPDR, and from April to September 2025 I was a JSPS PD. During these three and a half years (or unofficially, more than eight years!), I really enjoyed being a member of iTHEMS. Although I was often away on business trips in the last two and a half years, I have always appreciated the activities of iTHEMS. My research is on low-energy nuclear physics and quantum many-body problems using density functional theory. Only a few people in iTHEMS are working in this field, but I had many opportunities to learn about other areas such as physics, mathematics, mathematical biology, and machine learning. These experiences gave me new knowledge and even led to new research topics. In particular, during the pandemic, I was not officially a member of iTHEMS, but I still joined many activities and had many discussions with iTHEMS colleagues. These experiences strongly influenced my current research direction. From this April, iTHEMS has been expanding and the atmosphere is also changing. It was a great honor to be a member during such an important period. In October 2025, I moved to the Graduate School of Engineering, the University of Tokyo, as a Project Assistant Professor. Since RIKEN is still geographically close, I would like to continue joining 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.
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2025-09-30
セミナーレポート
iTHEMS Theoretical Physics Seminar by Amaury Micheli on September 30, 2025
In this seminar, spontaneous quasiparticle creation in an analogue preheating experiment is presented. Starting with a brief introduction of cosmological reheating and analogue gravity, recent experiments of spontaneous quasiparticle creation with Bose-Einstein condensates of cold atoms. There, various properties such as the entanglement of parametrically generated quasiparticle pairs are demonstrated. Reported by Yuta Sekino
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2025-09-26
受賞情報
三好建正チームディレクターがコルドバ市議会より「Guest of Honor」の称号を授与
2025年9月11日、予測科学研究チーム三好建正チームディレクターは、これまでの気候災害の予防と早期警戒システム開発への顕著な貢献を評価され、コルドバ市議会からGuest of Honor(Honorary Guest of Cordoba City)として表彰されました。 三好チームはコルドバにてSATREPSプロジェクト「PREVENIR」を主導しており、都市型洪水に対する早期警戒システムの開発を推進しています。 本プロジェクトは、応用科学の実践的な教育の場を提供するとともに、アルゼンチンを主とした国際的な協力体制の強化にも寄与しています。
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2025-09-26
受賞情報
北村侃基礎科学特別研究員が2025年度日本数学会建部賢弘奨励賞を受賞
北村 侃（iTHEMS基礎科学特別研究員）が、2025年度日本数学会建部賢弘奨励賞を受賞しました。 業績タイトルは「作用素環的量子群の研究」です。 おめでとうございます！
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2025-09-26
プレスリリース
新型コロナワクチンの継続的な接種を優先すべきは誰か？
名古屋大学 大学院理学研究科の岩見 真吾 教授（理化学研究所 数理創造研究センター 客員研究員）の研究グループは、福島県立医科大学の坪倉 正治 教授らとの共同研究により、COVID-19 mRNAワクチンの初回2回接種から1回目の追加接種後における血中IgG（S）抗体価の変動を解析し、「耐久型」「脆弱型」「急速低下型」という三つの特徴的な抗体応答パターンが存在することを明らかにしました。 詳細は関連リンクをご覧ください。
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2025-09-25
今週の論文Week 4, September 2025
Title: Effects of multidimensional treatment of gravity in simulations on supernova gravitational waves Author: Hajime Sotani, Bernhard Müller, Tomoya Takiwaki arXiv: http://arxiv.org/abs/2509.19724v1 Title: Superconductivity and Low Energy Excitations in an Attractive Hubbard Model Author: Yukimi Goto, Tohru Koma, Hironobu Yoshida arXiv: http://arxiv.org/abs/2509.19780v1 Title: Exact WKB Formulation of Quantization and Particle Production in Time-Dependent Backgrounds Author: Ryo Namba, Motoo Suzuki arXiv: http://arxiv.org/abs/2509.19194v1 Title: Finite-temperature Yang-Mills theories with the density of states method: towards the continuum limit Author: Ed Bennett, Biagio Lucini, David Mason, Maurizio Piai, Enrico Rinaldi, Davide Vadacchino, Fabian Zierler arXiv: http://arxiv.org/abs/2509.19009v1 Title: Quantum Metric Corrections to Liouville's Theorem and Chiral Kinetic Theory Author: Kazuya Mameda, Naoki Yamamoto arXiv: http://arxiv.org/abs/2509.15731v1 Title: $c$-structures and trace methods beyond connective rings Author: Ishan Levy, Vladimir Sosnilo arXiv: http://arxiv.org/abs/2509.14774v1
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2025-09-22
書籍
Unitary Evaporation and AdS/CFT
Masamichi Miyaji, Senior Research Scientist at iTHEMS (then at Kyoto University), contributed the chapter “Unitary Evaporation and AdS/CFT” to the newly published volume The Black Hole Information Paradox (Springer, 2025). In this chapter, he explains how the AdS/CFT correspondence provides a framework for addressing the black hole information paradox. He reviews essential tools such as the Ryu–Takayanagi formula and entanglement wedge reconstruction, and shows how recent progress involving Euclidean wormholes and gravitational path integrals leads to a unitary description of black hole evaporation, while also discussing the conceptual challenges that remain.
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2025-09-19
セミナーレポート
iTHEMS-NCTS Workshop on August 18, 2025
The Interdisciplinary Theoretical and Mathematical Sciences Center (iTHEMS) at RIKEN and the National Center for Theoretical Sciences (NCTS) continue to deepen their partnership under the 2022 Memorandum of Understanding by co-organizing an annual joint workshop. The second edition was held at Okochi Hall, RIKEN Wako Campus, from August 18 to 21, 2025, following the inaugural 2024 workshop in Taipei, Taiwan. This year’s workshop gathered researchers across condensed matter physics, high-energy physics, and mathematics under the banner “Matters to Spacetime: Symmetries & Geometry.” The four-day program featured plenary talks, invited sessions, a lively poster session, and a banquet that fostered vibrant discussion and new collaborations. Plenary Speakers (2025) Shinsei Ryu (Princeton University) Yasunori Nomura (UC Berkeley) Naoto Nagaosa (RIKEN CEMS) Hikaru Kawai (National Taiwan University) Chung-Jun Tsai (National Taiwan University) Beyond the main themes in condensed matter and high-energy physics, the program explicitly highlighted interdisciplinary research and strengthened ties with mathematics—including an “Interdisciplinary Section” on Day 1 and a “Math Section” on Day 4. Representative examples include Akinori Tanaka’s talk, “Understanding generative AI by Feynman’s path integral,” and Chung-Jun Tsai’s plenary, “Some rigidity and dynamical stability results of calibrated submanifolds.” These sessions underscored the growing interface between mathematical structures, AI-inspired methods, and fundamental physics. The workshop’s smooth execution was made possible by the tireless efforts of the iTHEMS assistants—especially Tomoko Iwanami—and the organizing teams: Tsukasa Tada, Masazumi Honda, Che-Yu Chen, Yuki Yokokura (RIKEN iTHEMS), and Chang-Tse Hsieh (NCTS). We are deeply grateful for the steadfast support from leadership on both sides—Satoshi Iso, Tetsuo Hatsuda, Guang-Yu Guo, and Pei-Ming Ho—whose opening/closing remarks and guidance framed the event’s goals and impact. We also thank the RIKEN Promotion Office for the funding arrangement that enabled this joint initiative. This second workshop further cemented research ties between iTHEMS and NCTS and broadened collaboration with the NCTS Math Division. Looking ahead, the 3rd iTHEMS–NCTS Joint Workshop is planned for Taiwan in the week of August 17, 2026. We look forward to continuing this annual tradition and expanding the scope of interdisciplinary exchange in the years to come. Reported by Ching-Kai Chiu
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2025-09-18
今週の論文Week 3, September 2025
Title: Probing Direct Waves in Black Hole Ringdowns Author: Naritaka Oshita, Sizheng Ma, Yanbei Chen, Huan Yang arXiv: http://arxiv.org/abs/2509.09165v1 Title: Matrix product state classification of 1D multipole symmetry protected topological phases Author: Takuma Saito, Weiguang Cao, Bo Han, Hiromi Ebisu arXiv: http://arxiv.org/abs/2509.09244v1 Title: Incomplete Reputation Information and Punishment in Indirect Reciprocity Author: Heejeong Kim, Yohsuke Murase arXiv: http://arxiv.org/abs/2509.09181v1 Title: Index theory and bulk-boundary correspondence for inversion-symmetric second-order topological insulators Author: Shin Hayashi arXiv: http://arxiv.org/abs/2509.09240v1 Title: Exact conditions for evolutionary stability in indirect reciprocity under noise Author: Nikoleta E. Glynatsi, Christian Hilbe, Yohsuke Murase arXiv: http://arxiv.org/abs/2509.08006v1
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2025-09-11
今週の論文Week 2, September 2025
Title: Heavy Field Effects on Inflationary Models in Light of ACT Data Author: Shuntaro Aoki, Hajime Otsuka, Ryota Yanagita arXiv: http://arxiv.org/abs/2509.06739v1 Title: From annular to toroidal knotoids and their bracket polynomials Author: Ioannis Diamantis, Sofia Lambropoulou, Sonia Mahmoudi arXiv: http://arxiv.org/abs/2509.05014v1 Title: Complexity of Quadratic Quantum Chaos Author: Pallab Basu, Suman Das, Pratik Nandy arXiv: http://arxiv.org/abs/2509.04075v1 Title: Stability analysis of two-fluid neutron stars featuring twin star and ultradense configurations Author: Ankit Kumar, Hajime Sotani arXiv: http://arxiv.org/abs/2509.03862v1 Title: Symmetries of equivariant Khovanov homology Author: Mikhail Khovanov, Taketo Sano arXiv: http://arxiv.org/abs/2509.03785v2
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2025-09-04
今週の論文Week 1, September 2025
Title: $S$-wave kaon-nucleon interactions from lattice QCD on the physical point Author: Kotaro Murakami, Sinya Aoki, Takumi Doi, Yan Lyu, Wren Yamada arXiv: http://arxiv.org/abs/2509.00838v1 Title: Eigenstate Thermalization Hypothesis with Projective Representation Author: Soma Onoda, Osamu Fukushima, Ryusuke Hamazaki, Okuto Morikawa arXiv: http://arxiv.org/abs/2509.01931v1 Title: Recent progress on charmed hadron interactions from lattice QCD Author: Yan Lyu arXiv: http://arxiv.org/abs/2509.03156v1 Title: Renormalization group analysis of color superconductivity revisited Author: Yuki Fujimoto arXiv: http://arxiv.org/abs/2508.19728v1 Title: Quantum Chaos, Thermalization, and Non-locality Author: Masataka Matsumoto, Shuta Nakajima, Masahiro Nozaki, Ryosuke Yoshii arXiv: http://arxiv.org/abs/2508.19556v1
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2025-09-04
ホットトピックFarewell message from Seishiro Ono
Our colleague, Seishiro Ono, has left iTHEMS at the end of August 2025 to join the Division of Condensed Matter Theory, The Institute for Solid State Physics (ISSP), The University of Tokyo as an Assistant Professor. We are grateful for his contributions and wish him every success in his new position. Here is a message from Seishiro: I joined iTHEMS in April 2023 as a Special Postdoctoral Researcher, and as of August 31, I have left iTHEMS to start my new position as a Research Associate at the Institute for Solid State Physics, the University of Tokyo. I would like to express my deepest gratitude to all members and staff at iTHEMS. Without such a supportive environment, I would not have been able to devote myself entirely to my research over the past two and a half years. I believe that iTHEMS is a truly unique research institute, and I have been continually impressed by its inspiring and researcher-friendly environment since I first joined. I sincerely hope to stay in touch, and I look forward to seeing you again in the near future. Once again, thank you very much for all your support in every respect.
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2025-09-04
今週の注目人物Self-introduction: Nikoleta E. Glynatsi
I am an applied mathematician and research software developer, currently working as a research scientist at the RIKEN Center for Computational Science and the Center for Interdisciplinary Theoretical and Mathematical Sciences. Previously, I was a postdoctoral researcher in the Dynamics of Social Behavior research group at the Max Planck Institute for Evolutionary Biology. I earned my PhD from the School of Mathematics at Cardiff University. My research focuses on applying game-theoretic modeling, agent-based simulations, and data analysis to understand behavior in social dilemmas and across various scientific fields. Beyond my research, I actively contribute to open-source projects. I am a fellow of the Software Sustainability Institute and serve as a topic editor for the Journal of Open Source Software.
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2025-09-01
セミナーレポート
GWX-EOS Seminar by Hiroshi Funaki on August 28, 2025
In this seminar, the gyromagnetic effect, which is the interconversion between macroscopic rotation and microrotation, was discussed in the context of neutron stars. Starting from the terrestrial experiments on gyromagnetic effects, including ferromagnetic rigid bodies, liquid metal, and quark-gluon plasmas, the universality of the gyromagnetic effects is explored. Then, the four angular-velocity model was introduced to describe the dynamics of the core and crust of the neutron stars. The model provides a new mechanism to explain pulsar glitches due to the gyromagnetic effect. Reported by Yuta Sekino
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2025-08-28
今週の論文Week 5, August 2025
Title: Classification of color superconductivity by one-gluon exchange helicity amplitudes and renormalization group equations Author: Yuki Fujimoto arXiv: http://arxiv.org/abs/2508.19222v1 Title: Low Angular Momentum Black Hole Accretion: First GRMHD Evidence of Standing Shocks Author: Jirong Mao, Indu K. Dihingia, Yosuke Mizuno, Shigehiro Nagataki arXiv: http://arxiv.org/abs/2507.22506v1 Title: Observation of the Axion quasiparticle in 2D MnBi$_2$Te$_4$ Author: Jian-Xiang Qiu, Barun Ghosh, Jan Schütte-Engel, Tiema Qian, Michael Smith, Yueh-Ting Yao, Junyeong Ahn, Yu-Fei Liu, Anyuan Gao, Christian Tzschaschel, Houchen Li, Ioannis Petrides, Damien Bérubé, Thao Dinh, Tianye Huang, Olivia Liebman, Emily M. Been, Joanna M. Blawat, Kenji Watanabe, Takashi Taniguchi, Kin Chung Fong, Hsin Lin, Peter P. Orth, Prineha Narang, Claudia Felser, Tay-Rong Chang, Ross McDonald, Robert J. McQueeney, Arun Bansil, Ivar Martin, Ni Ni, Qiong Ma, David J. E. Marsh, Ashvin Vishwanath, Su-Yang Xu doi: https://doi.org/10.1038/s41586-025-08862-x arXiv: http://arxiv.org/abs/2504.12572v1 Title: Unitary network: Tensor network unitaries with local unitarity Author: Wenqing Xie, Seishiro Ono, Hoi Chun Po arXiv: http://arxiv.org/abs/2508.16890v1 Title: Interfaces of discrete systems - spectral and index properties Author: Chris Bourne arXiv: http://arxiv.org/abs/2508.17813v1
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2025-08-27
今週の注目人物
Self-introduction: Sungsik Kong
I am interested in developing and understanding methods for inferring phylogenetic networks and hybrid speciation using genomic data under the coalescent model. I was a postdoctoral fellow at The Institute for Computational and Experimental Research in Mathematics (ICERM) at Brown University, mentored by Dr. Elizabeth Allman (University of Alaska-Fairbanks) and Dr. Scott Edwards (Harvard University). I was a postdoctoral research associate in the Solis-Lemus Lab at the Wisconsin Institute for Discovery at the University of Wisconsin-Madison. I received my Ph.D. in Evolution, Ecology and Organismal Biology at the Ohio State University advised by Dr. Laura Kubatko. I conferred B.Sc. and M.Sc. at University of Toronto, Canada, where I studied evolutionary biology and phylogenetics, advised by Dr. Robert Murphy. I also studied the evolution of Primate behavior with Dr. Deborah McLennan. Moreover, I worked as a researcher at Ewha Womans University in Seoul, South Korea, with Drs. Yikweon Jang and Jae Chun Choe.
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2025-08-27
今週の注目論文Observation of the Axion quasiparticle in 2D MnBi$_2$Te$_4$
In a recent study, researchers including Berkeley-Riken fellow Jan Schütte-Engel report a groundbreaking discovery in a material known as MnBi_2Te_4. They found direct evidence for what’s called a dynamical axion quasiparticle (DAQ), a coherent spin wave oscillation in the material that closely resembles the elusive axion particle predicted in high-energy physics. Particle physics axions, if found, could help explain puzzling mysteries like dark matter and a symmetry issue in particle physics called the strong CP problem. In the new study, the team used ultrafast “pump–probe” laser techniques to detect the DAQ. Particle physics axions have never been directly observed. The discovery of the DAQ opens exciting opportunities for both fundamental physics and future technologies. On the fundamental physics side, such materials could help in the detection of dark matter axions. The authors have calculated the sensitivity of these newly discovered DAQ for dark matter axion searches. On the technological side, precise control of the dynamic quantum properties may lead to novel sensors, high-speed electronics, and quantum devices.
173件のニュース / 2025年