ワークショップ

Japan-UK Workshop on Quantum Gravity

2025年9月22日(月) - 26日(金)

The universe at extremely early times is expected to be described by some theory of quantum gravity, although we still do not know precisely what quantum gravity actually is. In modern approaches to quantum gravity, the path integral point of view provides a fundamental framework towards answering this pressing question. However, an evaluation or even just a precise definition of the path-integral for a full-fledged quantum gravity is one of the most important open problems in modern theoretical physics.

会場: 融合連携イノベーション推進棟（IIB） 8階

イベント公式言語: 英語

Functional Renormalization Group at RIKEN 2025

2025年8月25日(月) - 26日(火)

Functional Renormalization Group (FRG) is a powerful theoretical framework for investigating physical systems described by field theory. Its applications span a wide range of areas, from condensed matter and statistical physics to particle physics and gravity. This two-day workshop aims to provide an overview of recent applications and developments of FRG across various fields, foster discussions on future directions, and explore opportunities for new collaborations.

会場: 理化学研究所 和光キャンパス 研究本館3階 345-347

イベント公式言語: 英語

iTHEMS-NCTS Workshop

2025年8月18日(月) - 21日(木)

This workshop aims to strengthen collaboration between researchers at RIKEN iTHEMS and the National Center for Theoretical Sciences in Taiwan. It will be a four-day event, with the first two days dedicated to interdisciplinary topics. The last two days will focus on specialized areas, with one day devoted to condensed matter physics and the other to high-energy physics, including quantum gravity.

会場: via Zoom / 理化学研究所 和光キャンパス

イベント公式言語: 英語

Crossroads of Virology and Mathematical Sciences

2025年8月8日(金) 9:30 - 17:30

竹田 誠 (東京大学 大学院医学系研究科 教授)
山次 康幸 (東京大学 農学生命科学研究科 教授)
氣駕 恒太郎 (国立健康危機管理研究機構 室長)
藤田 大士 (京都大学 高等研究院 (KUIAS) 准教授)
小磯 深幸 (九州大学 名誉教授)
黒田 大祐 (日本大学 文理学部 生命科学科 准教授)
カトゥリン・ボシゥメン (理化学研究所 数理創造研究センター (iTHEMS) 副センター長)
谷川 眞一 (東京大学 大学院情報理工学系研究科 准教授)
橋口 隆生 (京都大学 医生物学研究所 教授)
福原 秀雄 (北海道大学 人獣共通感染症国際共同研究所 准教授)
小嶋 将平 (理化学研究所 生命医科学研究センター (IMS) ゲノム免疫生物学理研白眉研究チーム 基礎科学特別研究員)
宮下 脩平 (東北大学 大学院農学研究科 助教)
富安 亮子 (九州大学 マス・フォア・インダストリ研究所 教授)
鈴木 雄太 (国立研究開発法人科学技術振興機構 (JST) 専任研究者)
Adnan Sljoka (理化学研究所 革新知能統合研究センター (AIP))

午前セッション①（ウイルス） 10:00–10:20 麻疹ウイルス工学 竹田 誠（東大 医学系研究科） 10:20–10:40 ポテックスウイルスに対する植物免疫機構 山次 康幸（東大 農学生命科学研究科） 10:40–11:00 ファージの巧妙な感染戦略と細菌の防御応答 氣駕 恒太郎（感染研） 休憩（11:00–11:15） 午前セッション②（分子・数理） 11:15–11:35 多面体型の分子自己集合体を自在に設計する 藤田大士（京大 高等研究院） 11:35–11:55 Anisotropic energy and (curved) polyhedron 小磯 深幸（九大） 11:55–12:15 自然界に倣う二成分タンパク質集合体のデザイン：細胞骨格様構造からウイルス様構造へ 鈴木 雄太（JSTさきがけ） 昼休憩（12:15–13:20） 午後セッション①（計算・数理） 13:20–13:40 Computer-aided antibody design 黒田 大祐（日本大学 生命科学科） 13:40–14:00 Revealing Protein Allostery and Functional Dynamics via Rigidity Theory and NMR Adnan Sljoka（理研 革新知能統合研究センター） 14:00–14:20 Using mathematical models to identify experimental pitfalls when probing virus replication in vitro Catherine Beauchemin（理研 iTHEMS） 14:20–14:40 Combinatorics behind statics and flexibility of graphs 谷川 眞一（東大 情報理工） 休憩（14:40–14:55） 午後セッション②（構造） 14:55–15:15 Glycoprotein structures in human pathogenic RNA viruses 橋口 隆生（京大 医生物） 15:15–15:35 北海道大学におけるクライオ電子顕微鏡設備の紹介 福原 秀雄（北大 人獣共通感染症研） 休憩（15:35–15:50） 午後セッション③（ウイルス・数理） 15:50–16:10 ウイルス感染時の宿主応答のヒト集団遺伝学 小嶋 将平（慶應大 Bio2Q） 16:10–16:30 陸上植物の自殺型抗ウイルス集団抵抗性 宮下 脩平（東北大 農学研究科） 16:30–16:50 Mathematical and crystallographic perspectives in virology 富安 亮子（九大 IMI） 組織委員: Catherine Beauchemin（理研 iTHEMS） 竹田 誠（東大 医学系研究科） 富安 亮子（九大 IMI）

会場: 研究本館 3階 359号室 (メイン会場) / via Zoom

The Theory of Periodic Tangles & Their Interdisciplinary Applications

2025年7月28日(月) - 8月1日(金)

The mathematical characterization of entanglement holds immense potential for describing the mechanical functions of diverse physical systems and materials. A universal interdisciplinary study, involving scientists, engineers, and artists promises both advance of the field itself and significant contribution to the research and design of innovative solutions for textiles, medical devices, polymers, molecular chemistry, or construction materials among others. The program seeks an alternative to the trial–and–error approach, bringing together academia and industry to seek new sustainable solutions and inspiration, contributing to society. It will consist not only of scientific exchanges but will promote cultural impact by organizing exhibitions or hands–on workshops. Additionally, it will encourage several discussions by providing networking opportunities and utilizing the unique venue of House of Creativity at Tohoku University. This workshop will gather researchers from various disciplines and include invited lectures, a poster session, roundtable discussions, and brainstorming activities. Our focus will be on exploring the connections between knot theory and its applications in areas such as polymers and soft matter, textile mechanics, graphic design, and more. This event includes a joint symposium between the WPI–AIMR (Tohoku University) and WPI–SKCM2 (Hiroshima University) on Friday, August 1st, 2025: INTERWOVEN: A WPI–AIMR & WPI–SKCM2 Symposium, Towards a Universal Topological Model of Entangled Structures for Sustainable Metamaterials Please fill in the registration form by June 16th 2025. Confirmed speakers (alphabetical order): Jörn Dunkel (Massachusetts Institute of Technology) Yuanyuan Guo (Tohoku University) Tatsuki Hayama (Keio University) Louis H. Kauffman (University of Illinois at Chicago) Yuka Kotorii (Hiroshima University) Sofia Lambropoulou (National Technical University of Athens) Eleni Panagiotou (Arizona State University) Pedro M. Reis (École Polytechnique Fédérale de Lausanne) Takahiro Sakaue (Aoyama Gakuin University) Vanessa Sanchez (Rice University) Henry Segerman (Oklahoma State University) Koya Shimokawa (Ochanomizu University) Hiroshi Suito (Tohoku University) Ryuichi Tarumi (Osaka University) Hirofumi Wada (Ritsumeikan University) Please refer to the workshop website via the relevant link for more details. We are looking forward to your participation and to welcoming you to Sendai!

会場: 東北大学片平キャンパス 知の館

イベント公式言語: 英語

Recent Developments and Challenges in Tensor Networks: Algorithms, Applications to science, and Rigorous theories

2025年7月28日(月) - 8月8日(金)

会場: 京都大学 基礎物理学研究所 湯川記念館 パナソニック国際交流ホール

イベント公式言語: 英語

iTHEMS-TheoryCenter(KEK) Scientific Writing and DEI Workshop

2025年6月24日(火) - 25日(水)

Ashleigh Griffin (Professor, Department of Biology, University of Oxford, UK)
Stuart West (Professor, Department of Biology, University of Oxford, UK)
入谷 亮介 (理化学研究所 数理創造研究センター (iTHEMS) 数理基礎部門 上級研究員)

This is a two-day KEK-iTHEMS workshop on scientific writing and diversity, equity, and inclusion. For more details, please visit the workshop website via the relevant link.

会場: 理化学研究所和光キャンパス 本部棟2階大会議室

イベント公式言語: 英語

Mini-Workshop on Neuro Science

2025年5月16日(金) 9:00 - 12:00

磯 暁 (理化学研究所 数理創造研究センター (iTHEMS) センター長)
磯村 拓哉 (理化学研究所 脳神経科学研究センター (CBS) 脳型知能理論研究ユニット ユニットリーダー)
豊泉 太郎 (理化学研究所 脳神経科学研究センター (CBS) 数理脳科学研究チーム チームディレクター)
岡ノ谷 一夫 (帝京大学 先端総合研究機構 教授)
入來 篤史 (帝京大学 先端総合研究機構 特任教授)
Gary Shiu (Professor, Department of Physics, University of Wisconsin-Madison, USA)

[Program] 9:00am – 9:05am Satoshi Iso (iTHEMS RIKEN) “Opening Remarks” 9:05am – 9:35am Takuya Isomura (CBS RIKEN) “Triple equivalence integrates neural network dynamics, statistical inference, and computation” 9:45m – 10:15am Taro Toyoizumi (CBS RIKEN) “Chaotic neural dynamics facilitate probabilistic computations through sampling” 10:25am – 10:55am Kazuo Okanoya (Teikyo University) “Brain topography and auditory processing in birds and rats” 11:05am – 11:30am Atsushi Iriki (Teikyo University, iTHEMS RIKEN) “From Classical to Quantum: Rethinking Science, Consciousness, and Civilization” 11:30am – Gary Shiu (University of Wisconsin) “Summary: Mathematical Science and Brain” Followed by a seminar 2:00pm – 3:30pm Prof. Gary Shiu (University of Wisconsin) Topology and Brain Science Room 359, 3rd floor, Main Research Building, RIKEN

会場: 理化学研究所 和光キャンパス 研究本館3階 345-347 (メイン会場) / via Zoom

イベント公式言語: 英語

From Quarks to Neutron Stars: Insights from kHz gravitational waves

2025年4月23日(水) - 24日(木)

Astronomical observations of binary neutron star mergers and supernovae provide unique opportunities to explore physics spanning from quarks to neutron stars. The groundbreaking multi-messenger observation of GW170817, combining electromagnetic signals and gravitational waves, vividly demonstrated this potential. Furthermore, if a core-collapse supernova were to occur in our galaxy, it would likely become the first event where electromagnetic signals, neutrinos, and gravitational waves are detected together. The interior of neutron stars is not yet well understood due to their extreme density, where exotic states of matter may emerge. Gravitational waves, particularly in the kilohertz band, play a crucial role in extracting information about such ultra-high densities. In recent years, several concepts for kilohertz-band gravitational wave detectors, such as Australia's NEMO, have been proposed to advance multi-messenger studies of high density astrophysical objects. KAGRA in Japan is also exploring upgrades aimed at enhancing high-frequency sensitivity, which could significantly improve sky localization accuracy and enable the detection of post-merger signals. This workshop aims to explore the transformative potential of high-frequency gravitational wave observations for multi-messenger astrophysics, with a focus on their implications for nuclear and neutron star physics. The workshop aims to spark dynamic discussions and cultivate new collaborations among participants through invited talks by leading experts and engaging poster presentations.

会場: via Zoom

イベント公式言語: 英語

Third Workshop on Density Functional Theory: Fundamentals, Developments, and Applications (DFT2025)

2025年3月25日(火) - 27日(木)

The density functional theory (DFT) is one of the powerful methods to solve quantum many-body problems, which, in principle, gives the exact energy and density of the ground state. The accuracy of DFT is, in practice, determined by the accuracy of an energy density functional (EDF) since the exact EDF is still unknown. Currently, DFT has been used in many communities, including nuclear physics, quantum chemistry, and condensed matter physics, while the fundamental study of DFT, such as the first principle derivations of an accurate EDF and methods to calculate many observables from obtained densities and excited states, is still ongoing. However, there has been little opportunity to have interdisciplinary communication. On December 2022, we had the first workshop on this series (DFT2022) at Yukawa Institute for Theoretical Physics, Kyoto University, and several interdisciplinary discussions and collaborations were started. On February 2024, we had the second workshop on this series (DFT2024) at RIKEN Kobe Campus, and more stimulated discussion occured. To keep and extend collaborations, we organize the third workshop. Since the third workshop, we extend the scope of the workshop to the development and application of DFT as well. In this workshop, the current status and issues of each discipline will be shared towards solving these problems by meeting together among researchers in mathematics, nuclear physics, quantum chemistry, and condensed matter physics. This workshop mainly comprises lectures/seminars on cutting-edge topics and discussion, while sessions composed of contributed talks are also planned.

会場: 融合連携イノベーション推進棟（IIB） 8階 / via Zoom

イベント公式言語: 英語

Kyushu IAS-iTHEMS conference: Non-perturbative methods in QFT

2025年3月10日(月) - 14日(金)

The most commonly used approach in the study of QFT is perturbation theory. Indeed, we have succeeded in extracting various physical quantities from perturbative (asymptotic) expansions. However, some physical phenomena cannot be captured through perturbative analyses alone. How can we extract these non-perturbative effects? In QFTs with conformal symmetry (i.e., CFTs), correlation functions can be computed using a method called the conformal bootstrap. This non-perturbative method differs entirely from the usual correlation function analysis methods of QFT, as it does not even assume the existence of a Lagrangian. Through the use of the conformal bootstrap, we have actually made significant progress in the non-perturbative understanding of CFTs. Furthermore, according to the holographic principle, CFTs provide a non-perturbative formulation of QFTs with gravity (i.e., quantum gravity). By applying the holographic principle to various non-perturbative results from CFTs, such as those obtained from the conformal bootstrap, we have made remarkable advances in understanding the non-perturbative aspects of quantum gravity. Conversely, the holographic principle is also used to understand properties of QFTs that are difficult to analyze perturbatively, through gravity.

会場: 九州大学伊都キャンパス稲盛ホール

イベント公式言語: 英語

理化学研究所-奈良女子大学理学部合同 ダイバーシティ推進ワークショップ 2025

2025年3月3日(月) - 4日(火)

理化学研究所数理創造プログラム(iTHEMS)と奈良女子大学理学部は、理化学研究所ダイバーシティ推進室の後援を得て女性研究者育成事業を進めている。その一環として、奈良女子大学の学部生・大学院生19名が、理化学研究所和光キャンパスの複数の研究室を訪問し、研究内容について質疑を行うとともに、iTHEMSの研究者とともにワークショップを開催し、学生自らが発表を行う。 主催：理化学研究所数理創造プログラム、奈良女子大学理学部 プログラム： 13:50-15:15 仁科センター（RNC）RIBF施設（E01, 仁科RIBF棟） 15:30-16:30 数理創造プログラム（iTHEMS）（C01 研究本館、3階359号室） iTHEMS の紹介: 初⽥哲男（iTHEMS ディレクター） 講演と質疑: 廣島渚（iTHEMS） 16:45-18:00 脳神経科学研究センター（CBS）（C56 池之端棟、３階316室） 知覚運動統合機構研究チーム（久保郁チームリーダー） 18:30-21:00 情報交換会（C01, 研究本館3F） 9:15-10:30 光量⼦⼯学研究センター（RAP）（C32 レーザー研究棟 中会議室A） 光量⼦制御技術開発チーム（和⽥智之チームリーダー） 10:45-12:00 環境資源科学研究センター（CSRS）（S01 ⽣物科学研究棟 S311） 分⼦⽣命制御研究チーム（萩原伸也チームリーダー）

会場: 理化学研究所 和光キャンパス

Asymptotics in astrophysics iTHEMS workshop

2025年2月25日(火) - 28日(金)

This workshop will include overview talks of application of asymptotics and perturbation theory techniques in (wave transport or oscillation related) astrophysics and cosmology eigenvalue problems. In addition, there will be introductory talks about fundamental asymptotics and perturbation theory techniques used in theoretical physics. The purpose of this interdisciplinary workshop is to identify problems in astrophysics and related fields including, but not limited to, stellar structure and evolution, black holes and high-energy physics which can be solved using existing asymptotics and perturbation theory methods in theoretical physics problems (e.g. quantum field theory, gravity), and vice versa.

会場: 融合連携イノベーション推進棟（IIB） 8階

イベント公式言語: 英語

Theories of Astrophysical Big Bangs 2025

2025年2月17日(月) - 19日(水)

We are pleased to announce an international workshop on theories of Astrophysical Big Bangs. The main topics of the workshop are listed below, although the topics are not limited to these areas. We aim to cover a broad range of astrophysical research concerning various types of cosmic explosions and compact objects. Neutron Stars Neutron Star Mergers Gravitational Waves Gamma-Ray Bursts Supernovae Supernova Remnants This workshop aims to assemble leading experts in various fields of astrophysical big bangs for vibrant discussions and to foster new collaborations among participants. Program (last updated 2025.02.17) 17Feb. 10:00-10:10 Opening Remarks by Hiro Nagataki (RIKEN) Special Talk 10:10-11:10 (50+10) Daniel Kasen (U.C. Berkeley) Radiative Transfer Modeling of Explosive Transients NS mergers, Kilonovae, and Gravitational Waves 11:10-11:50 (30+10) Masaomi Tanaka (Tohoku U.) Decoding light curves and spectra of kilonovae 11:50-12:30 (30+10) Kenta Hotokezaka (U. Tokyo) Kilonova Nebular Emission 12:30-14:00 Lunch Break and Poster Session 14:00-14:40 (30+10) Kipp Cannon (U. Tokyo) Selection Effects in Gravitational-Wave Observations 14:40-15:20 (30+10) Koutarou Kyutoku (Chiba U.) Signature of hadron-quark crossover in binary-neutron-star mergers 15:20-15:50 Poster Presentations & Coffee Break 15:50-16:30 (30+10) Luca Baiotti (Osaka U.) Investigating ultra-high-density equations of state through gravitational waves from binary neutron stars mergers Supernovae & Gamma-Ray Bursts (Chair A. Mizuta) 16:30-17:10 (30+10) Nozomu Tominaga (NAOJ) Transient studies using Subaru/Hyper Suprime-Cam 17:10-17:50 (30+10) Tianshu Wang (UCB) Three-Dimensional Long-Term CCSN Simulations: New Insights and Challenges 18 Feb. Gamma-Ray Bursts 9:00-9:30 (25+5) Akira Mizuta (RIKEN) 3D relativistic GRB jet propagation in collapsars 9:30-10:00 (25+5) Jin Matsumoto (Fukuoka U.) Nonlinear dynamics of relativistic magnetized jet with field reversals 10:00-10:30 (25+5) Hirotaka Ito (RIKEN) Numerical simulations of photospheric emission in GRBs 10:30-11:00 (25+5) Maria Dainotti (NAOJ) GRBs and SNe Ia cosmology to cast the Hubble constant tension 11:00-11:30 Poster Presentations & Coffee Break 11:30-12:10 (30+10) Kunihito Ioka (Kyoto U.) GRB Cocoon + Scattering in FRB Neutron Stars 12:10-12:40 (25+5) Hajime Sotani (Kochi U.) Supernova gravitational waves and asteroseismology 12:40-14:00 Lunch Break & Poster Presentations 14:00-14:30 (25+5) Akira Dohi (RIKEN) Modeling of Clocked X-ray Bursters Progenitor Stars 14:30-15:10 (30+10) Hideyuki Umeda (U. Tokyo) Progenitors of low-mass Fe core collapse supernovae and properties of supernova explosions 15:10-15:40 (25+5) Lucy McNeill (Kyoto U.) Finite temperature treatment of white dwarf merger progenitors 15:40-16:10 Poster Presentations & Coffee Break Core-Collapse Supernovae 16:10-16:50 (30+10) Tomoya Takiwaki (NAOJ) Diversity of explosion mechanisms of core-collapse supernovae 16:50-17:30 (30+10) Hiroki Nagakura (NAOJ) Open issues in numerical modeling of core-collapse supernova 17:30-18:10 (30+10) Yudai Suwa (U. Tokyo) Probing supernova interiors with neutrinos 18:30-21:00 Banquet & Poster Presentations 19 Feb. Supernovae, Supernova Remnants, and Nucleosynthesis 10:00-10:40 (30+10) Ke-Jung Chen (ASIAA) Supernovae of very massive stars 10:40-11:20 (30+10) Masaomi Ono (ASIAA) Evolution of core-collapse supernovae from explosion to supernova remnant 11:20-12:00 (30+10) Hiroya Yamaguchi (JAXA) XRISM view of supernova remnants 12:00-12:40 (30+10) Shiu-Hang Lee (Kyoto U.) Super high-speed three-dimensional hydrodynamic simulations of supernova remnants and their applications in the era of microcalorimetric X-ray spectroscopy 12:40-14:00 Lunch Break 14:00-14:40 (30+10) Gilles Ferrand (U. Manitoba) Typing thermonuclear explosions from observations of young supernova remnants 14:40-15:20 (30+10) Nobuya Nishimura (U. Tokyo) Toward new nuclear astrophysics experiments for explosive nucleosynthesis in core-collapse supernovae 15:20-16:00 (30+10) Ryosuke Hirai (RIKEN) Supernovae in binary systems 16:00-17:00 (60) Coffee Break and Free Discussion

会場: 理化学研究所 和光キャンパス

イベント公式言語: 英語

Pebbles in Planet Formation

2025年2月10日(月) - 13日(木)

Research on planet formation involves various approaches, including explorations of small solar system bodies, observations of protoplanetary disks, dust experiments, simulations, and theoretical studies. One of the primary objectives in this field is to develop a comprehensive theory that explains how kilometer-sized planetesimals form from micrometer-sized dust grains, drawing upon findings from these diverse research methods. This workshop will focus on the concept of pebbles, which play a crucial role in the planet formation process. Pebbles — typically defined as solids ranging from millimeter to centimeter in size — are intermediate building blocks in planet formation, though their definition varies depending on the context. Assuming pebbles has led to theoretical advances in mechanisms such as streaming instability and pebble accretion, which promote the formation and growth of planetesimals. Additionally, pebbles have been linked to barriers against dust growth, such as the bouncing barrier. Furthermore, observations of protoplanetary disks have revealed the size distribution and porosity of solids, while the strength and thermal conductivity of comets obtained by the Rosetta mission suggest the accumulation of pebbles due to disk instabilities. However, inconsistencies have been pointed out between pebble formation and theories of dust growth. This workshop aims to revisit and refine our understanding of solid materials implicated in planet formation, particularly in light of findings from solar system explorations and protoplanetary disk observations. We aim to reevaluate the definition and role of pebbles in the broader context of planet formation, with a special focus on the current challenges and open questions in the field. The workshop will include discussions of experiments and simulations of dust growth and collisions, and planetesimal formation mechanisms such as streaming instability. The workshop features keynote talks from the perspectives of explorations, observations, experiments, simulations, and theories, and we also call for presentations on related topics.

会場: 国立天文台三鷹キャンパス (メイン会場) / via Zoom

イベント公式言語: 英語

High Energy Physics in the Quantum Era

2024年12月2日(月) - 4日(水)

This workshop is co-hosted by KEK Theory Center and RIKEN iTHEMS to inaugurate their new partnership in theoretical studies of high energy physics and related subjects with special emphasis on development and application of quantum technologies. The workshop aims for developing new connection between particle physics and quantum information/technologies. In the situation where significant progress is expected in the field of quantum information and technologies, it is quite important to discuss how such progress can be used in physics researches. Also, new techniques or new theoretical formulations of quantum field theory/quantum gravity may give deeper understanding of our quantum world. In this workshop, we would like to have world-leading researchers both from particle physics and quantum technologies, and drive lively discussions on future prospects. We are trying to limit the number of talks to be as minimal as possible, so that we have plenty of time for discussions. The workshop is in-person only.

会場: 高エネルギー加速器研究機構 (KEK) つくばキャンパス 小林ホール

イベント公式言語: 英語

Entanglements & Applications

2024年11月18日(月) 9:30 - 15:00

Myfanwy Evans (Professor, Institute of Mathematics, University of Potsdam, Germany)
Stephen Hyde (Emeritus Professor, Materials Physics, Australian National University, Australia)
Toky Andriamanalina (Ph.D. Student, Institute of Mathematics, University of Potsdam, Germany)

9:30-10:30: Toky Andriamanalina Title: Untangling 3-periodic entanglements of filaments and nets Abstract: Entanglements of curves and nets can used to describe various biological and chemical structures, such as coordination polymers, liquid crystals, or DNA origami crystals. We recently developed new diagrammatic descriptions of 3-periodic entanglements. These new diagrams are drawn out of a projection along one axis of a unit cell of a 3-periodic structure. By using these diagrams, we define the notion of untangling number for 3-periodic structures, which is a measure of complexity of the entanglement. Thanks to this, it is now possible to characterise the least tangled structures that we call ground states, and in particular we show that the rod packings are the generic ground states of entanglements of curves. 10:30-11:00: coffee break 11:00 - 12:00: Stephen Hyde Title: Tangles... and untangles Abstract: Knots, braids, links, self-entangled nets, multiple catenated infinite nets... are examples of what we call, simply, “tangles”. They are relevant to molecular-scale (bio)materials, from duplexed ssRNA to metal-organic frameworks. We are interested in understanding: 1.Which tangles are “simple”? 2.How tangled is a tangle!? Our tangle toolkit is a simple one: we assemble helices into networks, allowing a broad spectrum of tangles to be built, from knots to tangled nets. Interesting “simple” tangles are entanglements of the edges of Platonic polyhedra [1] and entangled 2-periodic nets [2]. A proposed answer to point 2. above will be discussed. if there is time. The ideas are at present largely unpublished, and being working into a book to be published, we hope, in late 2025 [3]. 13:00 - 14:00: Myfanwy Evans Title: Can solvents tie knots? Helical folds of biopolymers in liquid environments. Abstract: Using a simulation technique based on the morphometric approach to solvation, we performed computer experiments which fold a short open flexible tube, modelling a biopolymer in aqueous environments, according to the interaction of the tube with the solvent alone. We find an array of helical geometries that self-assemble depending on the solvent conditions, including symmetric double helices where the strand folds back on itself and overhand knot motifs. Interestingly these shapes—in all their variety—are energetically favoured over the optimal helix. By differentiating the role of solvation in self–assembly our study helps illuminate the energetic background scenery in which all soluble biomolecules live. This event is organized with the Interdisciplinary Math Study Group.

会場: セミナー室 (359号室)

イベント公式言語: 英語

RIKEN iTHEMSのアウトリーチについての研究会 2024

2024年11月15日(金) - 17日(日)

本年度の「RIKEN iTHEMSのアウトリーチについての研究会2024＠仙台&ZOOM」を2泊3日の日程で、11月15日(金)-11月17日(日) にiTHEMS SUURI-COOL (Sendai) の協力のもと東北大学知の創出センター「知の館」において、対面で、Zoomを併用して開催いたします。

会場: 東北大学片平キャンパス 知の館 (メイン会場) / via Zoom

イベント公式言語: 日本語

Knitting Day

2024年11月1日(金) 10:00 - 16:00

佐野 友彦 (慶応義塾大学 理工学部 機械工学科 専任講師)
Samuel Poincloux (青山学院大学 理工学部 物理・数理学科 助教)
後藤 大輝 (慶應義塾大学 修士課程)
嶋本 大祐 (東京大学 修士課程)
田尻 琴音 (慶應義塾大学 修士課程)
ソニア・マムーディ (東北大学 材料科学高等研究所 (AIMR) 数学連携グループ 助教)

The 'Knitting Day' event is a one-day gathering that brings together students and researchers from diverse fields to explore the fascinating connections between the topology and mechanics of knitting. It aims to foster interdisciplinary discussions on how knitting techniques can be understood through mathematical, physical, and engineering lenses and their potential applications in industry. This event is organized with the Interdisciplinary Math Study Group. Schedule: 10:00 – 10:30: Welcome coffee 10:30 – 11:00: Samuel Poincloux 11:10 – 11:30: Kotone Tajiri 11:30 – 12:00: Discussion 12:00 – 13:00: Lunch 13:00 – 13:30: Daisuke Shimamoto 13:40 – 14:00: Taiki Goto 14:00 – 14:30: Discussion 14:30 – 15:10: Sonia Mahmoudi 15:10 – 16:00: Discussion & Coffee Break 16:00-18:00: Internal Discussion From 18:00: Dinner Titles: Taiki Goto: Twist deformation in trefoil knot Sonia Mahmoudi: A new topological model of knitting Samuel Poincloux: Knit mechanics and frictional troubles Daisuke Shimamoto: TBA Kotone Tajiri: Curling morphology of knitted fabrics: structure and mechanics

会場: 研究本館 3階 345−347号室

イベント公式言語: 英語

RIKEN Quantum Workshop on “Quantum-Like Modeling” in Cognitive & Social Sciences

2024年10月11日(金) 14:00 - 19:00

Recently, there has been a growing trend to consider cognitive, and social phenomena as Open Quantum Systems, and to mathematically define the fundamental principles behind them through so-called “Quantum-Like Modeling”. It has been extremely difficult to systematically explain complexities of such phenomena within humans’ cognitive traits based on classical “rational” reasoning. Quantum-Like Modeling suggests that using quantum probability calculus and its applications could be useful to rationalize such phenomena and expand previous understandings, obtained through simple linear algebra, by applying quantum formalizations. Just as physicists explored a new branch of mathematics, the theory of operators in complex Hilbert space, to describe the quantum phenomena in an effective way, considerations here will be built on the methodology and mathematical apparatus of quantum theory and directed to applications outside of physics, namely to, cognition, psychology, decision-making, economics, finances, as well as the social and political sciences. Programme 14:00~14:10 Atsushi Iriki: Introduction. Potential of quantum computing for humanities 14:10~15:10 Andrei Khrennikov: Tutorial. Ubiquitous Quantum: from genetics and biological evolution to cognition, psychology, decision making, and social science 15:10~15:40 Masanao Ozawa: Quantum Instrument -- Measurement to cognition with QC-simulation Break 16:00~16:30 Haruki Emori: Applications of quantum computers to cognitive sciences based on Quantum Instrument 16:30~17:00 Miho Fuyama: Subjective Experiences and Superposition State in Narrative Reading 17:00~17:30 General Discussion 18:00~19:00 Networking Mixer (RIKEN canteen #1) Registration Deadline September 26 (Thur), 2024 (for those attending both the workshop and networking mixer (banquet, free of charge)) October 4 (Fri), 2024 (for those attending only the workshop)

会場: セミナー室 (359号室)

イベント公式言語: 英語