Journal club of Information Theory SG
December 1 at 13:00 - 14:00, 2020
Dr. Akinori Tanaka (Senior Research Scientist, iTHEMS)
The practical updating process of deep neural networks based on stochastic gradient descent is quite similar to stochastic dynamics described by Langevin equation. Under the Langevin system, we can "d...more
Venue: via Zoom
Event Official Language: English
Flat and spherical surface approximations
November 30 at 16:00 - 17:30, 2020
Dr. Martin Skrodzki (Visiting Researcher, iTHEMS)
State-of-the-art acquisition devices produce surface representations of increasingly high resolution. While these detailed representations are important for production, they are problematic e.g. when ...more
Venue: via Zoom
Event Official Language: English
Rotifer can be a good model organism for theoretical biology
November 27 at 10:00 - 11:00, 2020
Dr. Yuri Konami (Specially Appointed Assistant Professor, Graduate School of Agricultural and Life Sciences, The University of Tokyo)
Rotifers are cylindrical zooplankton which constitute the phylum Rotifera. They have organs and tissues including ganglia, muscles, digestive organs, ovaries, and sensory organs in their <1mm body. Ro...more
Venue: via Zoom
Event Official Language: English
The Unreasonable Effectiveness of Quantum Theory in Mathematics
November 26 at 10:00 - 11:30, 2020
Prof. Robbert Dijkgraaf (Director, Institute for Advanced Study in Princeton, USA)
November 26 at 10:00-11:30, 2020 (JST) November 25 at 20:00-21:30, 2020 (EST) The physical concepts of quantum theory, in particular of quantum gravity and string theory, have proven to be extreme...more
Venue: via Zoom
Event Official Language: English
Symmetry and conservation laws in neural networks
November 20 at 10:00 - 11:00, 2020
Dr. Hidenori Tanaka (Group Leader & Senior Scientist, Physics & Informatics Laboratories, NTT Research, Inc., USA / Visiting Scholar, Stanford University, USA)
Symmetry is the central guiding principle in the exploration of the physical world but has been underutilized in understanding and engineering neural networks. We first identify simple yet powerful ge...more
Venue: via Zoom
Event Official Language: English
Representations of fundamental groups and 3-manifold topology
November 16 at 16:00 - 18:10, 2020
Dr. Takahiro Kitayama (Associate Professor, Graduate School of Mathematical Sciences, The university of Tokyo)
In 3-dimensional topology the great progress during the last two decades revealed that various properties of 3-manifolds are well understood from their fundamental groups. I will give an introduction ...more
Venue: via Zoom
Event Official Language: English
Efficient probabilistic assessment of building performance: sequential Monte Carlo and decomposition methods
November 13 at 16:00 - 18:10, 2020
Dr. Tianfeng Hou (Postdoctoral Researcher, iTHEMS)
The use of numerical simulations for complex systems is common. However, significant uncertainties may exist for many of the involved variables, and in order to ensure the reliability of our simulatio...more
Venue: via Zoom
Event Official Language: English
The 13th MACS colloquium
November 13 at 15:00 - 18:00, 2020
Prof. Shin-ya Kawaguchi
(Professor, Division of Biological Sciences, Kyoto University Graduate School of Science)
Dr. Yuji Sugita
(Chief Scientist, Theoretical Molecular Science Laboratory, RIKEN Cluster for Pioneering Research)
15:00〜16:00 川口 真也「神経系のやわらかい情報処理」 16:15〜17:15 杉田 有治「計算機シミュレーションで細胞の中を観る」 17:15～18:00 継続討論会
Venue: via Online
Event Official Language: Japanese
Some idea on quantum tunneling via Lefschetz thimbles
November 12 at 10:30 - 12:00, 2020
Dr. Yuya Tanizaki (Assistant Professor, Yukawa Institute for Theoretical Physics, Kyoto University)
In this talk, I will explain my previous study with Takayuki Koike on a possible approach to quantum tunneling via Lefschetz thimbles. We classified all the complex saddle points for the real-time pat...more
Venue: via Zoom
Event Official Language: English
Mathematics of thermalization in isolated quantum systems
November 10 at 16:00 - 18:10, 2020
Dr. Naoto Shiraishi (assistant professor, Faculty of Science Department of Physics, Gakushuin University)
If an isolated macroscopic quantum system is left at a nonequilibrium state, then this system will relax to the unique equilibrium state, which is called thermalization. Most of quantum many-body syst...more
Venue: via Zoom
Event Official Language: English
Mathematical aspects of quasi-Monte Carlo integration
November 5 at 16:00 - 18:10, 2020
Dr. Kosuke Suzuki (Assistant Professor, Graduate School of Advanced Science and Engineering, Hiroshima University)
In this talk, I will introduce mathematical aspects of quasi-Monte Carlo (QMC) integration. We aim to approximate the integral of a function on the d-dimensional hypercube [0,1]^d. A useful approach i...more
Venue: via Zoom
Event Official Language: English
Evolution of a peak of genetic divergence driven by local adaptation
November 5 at 10:00 - 11:00, 2020
Dr. Takahiro Sakamoto (Postdoctoral Researcher, The Graduate University for Advanced Studies, SOKENDAI)
In species that are distributed in various environments, each subpopulation adapts to the local environment. In general, when there is migration between subpopulations, genetic divergence does not pro...more
Venue: via Zoom
Event Official Language: English
A physicist’s adventures in virology: Catherine Beauchemin live webcast
November 5 at 9:00 - 10:00, 2020
Prof. Catherine Beauchemin (Deputy Program Director, iTHEMS)
In her public lecture webcast, physicist Catherine Beauchemin will draw on contemporary examples from COVID-19 and influenza to explain eroding public trust in health research and why physics might be...more
Venue: via Online
Event Official Language: English
The Mathematical Society of Japan: Cross-discipline and cross-industry research exchange meeting 2020
October 31 at 10:00 - 17:00, 2020
「数学・数理科学専攻若手研究者のための異分野・異業種研究交流会（研究交流会）」は、 数学・数理科学専攻の博士課程学生をはじめとする若手研究者と産業界を含む異分野の方々 との「双方向の交流の場」として2014年から開催しております。若手研究者の皆様に、諸科学や産業への応用展開のような数学の思わぬ力を発見してもらう ことや、産業界を含む様々な分野で活躍できる場の存在を認識してもらうことが主たる目的 で...more
Venue: via Online
Event Official Language: Japanese
Basics of population genomic data analysis
October 29 at 10:00 - 11:00, 2020
Dr. Jeffrey Fawcett (Senior Research Scientist, iTHEMS)
In recent years, it has become possible to obtain the DNA sequence data of a large number of individuals of the same species. This data set is basically a M (number of samples) x N (number of genomic ...more
Venue: via Zoom
Event Official Language: English
Toward simulating Superstring/M-theory on a Quantum Computer
October 23 at 17:00 - 18:00, 2020
Dr. Masanori Hanada (Department of Mathematics, University of Surrey, UK)
We present a framework for simulating superstring/M-theory on a quantum computer, based on holographic duality. Because holographicduality maps superstring/M-theory to quantum field theories (QFTs), w...more
Venue: via Zoom
Event Official Language: English
Realistic shell model and chiral three-body force
October 22 at 13:30 - 15:00, 2020
Dr. Tokuro Fukui (Researcher, Yukawa Institute for Theoretical Physics, Kyoto University)
We show an evolution to derive the effective Hamiltonian in the shell-model framework starting from two- and three-body interactions based on the chiral effective field theory. A new way to calculate ...more
Venue: via Zoom
Event Official Language: English
Daikanyama College of Music Lecture Series Vol.1 - Music x Mathematics : May not music be described as the mathematics of the sense, mathematics as music of the reason?
October 21 at 20:00 - 21:00, 2020
Prof. Takashi Tsuboi (Deputy Program Director, iTHEMS)
Prof. Takashi Tsuboi, Deputy Program Director of iTHEMS will explain the beauty and harmony of Mathematics together with the piano performance by Rutsuko Yamagishi.
Venue: via Online
Event Official Language: Japanese
Bayesian nonparametric estimation of Random Dynamical Systems
October 21 at 14:00 - 15:00, 2020
Dr. Christos Merkatas (Postdoctoral Researcher, Aalto University, Finland)
In this talk, a Bayesian nonparametric framework for the estimation and prediction, from observed time series data, of discretized random dynamical systems is presented [1]. The size of the observed t...more
Venue: via Zoom
Event Official Language: English
Symposium in Commemoration of Professor Emeritus Shun'ichi Amari receiving the Order of Culture
October 21 at 13:00 - 18:00, 2020
A symposium will be held to commemorate Professor Emeritus Shun'ichi Amari (Graduate School of Engineering, The University of Tokyo) receiving the 2019 Order of Culture.
Venue: via Online
Event Official Language: Japanese
Composite Dark matter and gravitational waves
October 20 at 10:00 - 11:00, 2020
Dr. Enrico Rinaldi (Visiting Scientist (Industry), iTHEMS)
With non-perturbative lattice calculations we investigate the finite-temperature confinement transition of a composite dark matter model. We focus on the regime in which this early-universe transition...more
Venue: via Zoom
Event Official Language: English
MCME SYMPOSIUM 2020
October 15 - 16, 2020
Dr. Tetsuo Hatsuda
(Program Director, iTHEMS)
Dr. Ryusuke Hamazaki
(Senior Research Scientist, iTHEMS)
"MCME SYMPOSIUM 2020" will be held at the Musashino Center of Mathematical Engineering of Musashino University. This symposium is free of charge and open to everyone. [Some excerpts from the progra...more
Venue: via Online
Event Official Language: Japanese
A PDE model for the localization and spread of flu in the human respiratory tract
October 14 at 10:00 - 11:00, 2020
Mr. Christian Quirouette (PhD student, Department of Medical Physics, Ryerson University, Canada)
Within the human respiratory tract (HRT), virus diffuses through the periciliary fluid (PCF) bathing the epithelium. But it also undergoes advection: as the mucus layer sitting atop the PCF is pushed ...more
Venue: via Zoom
Event Official Language: English
Tetsuo Hatsuda x Koji Hashimoto x Aiko Teranishi "Science for the Future"-"The Usefulness of Useless Knowledge" (University of Tokyo Press) Commemorative Publication
October 10 at 15:00 - 17:00, 2020
Dr. Tetsuo Hatsuda
(Program Director, iTHEMS)
Prof. Koji Hashimoto
(Professor, Department of physics, Osaka University)
Ms. Aiko Teranishi
(President and CEO, indigo.inc)
Dr. Tetsuo Hatsuda, iTHEMS Program Director, published "The Usefulness of Useless Knowledge" in this July by the University of Tokyo Press. This book is a collection of essays by Abraham Flexner, the ...more
Venue: via Online
Event Official Language: Japanese
Forefront of Modern Science: Frontiers in Mathematics, Astronomy, Physics, Biology and Computation
October 2 at 16:20 - 17:50, 2020
Dr. Tetsuo Hatsuda
(Program Director, iTHEMS)
Dr. Yuka Kotorii
(Visiting Scientist (Academia), iTHEMS)
Dr. Shigehiro Nagataki
(Deputy Program Director, iTHEMS)
Dr. Makiko Nio
(Senior Researcher, Nishina Center for Accelerator-Based Science, Riken)
Dr. Ryosuke Iritani
(Research Scientist, iTHEMS)
Dr. Ai Niitsu
(Postdoctoral Researcher, Theoretical Molecular Science Laboratory, RIKEN)
Dr. Shigenori Otsuka
(Research Scientist, iTHEMS)
Dr. Emi Yukawa
(Assistant Professor, Department of Physics, Faculty of Science Division I, Tokyo University of Science)
1回目 2002年10月2日 初田 哲男「数理が開く科学の扉」 2・3回目 10月9日、10月16日 小鳥居 祐香「空間の形を見る」 4・5回目 10月23日、10月30日 長瀧 重博「巨大星の爆発と中性子星・ブラックホール」 6・7回目 11月6日、11月13日 仁尾 真紀子「素粒子物理学へようこそ」 8・9回目 11月20日、11月27日 入谷 亮介「自然淘汰...more
Venue: Changed to Zoom
Event Official Language: Japanese
TQFT, integrable lattice model, and quiver gauge theories
October 2 at 16:00 - 18:00, 2020
Mr. Toshihiro Ota (Student Trainee, iTHEMS)
- 1st part (math): In physics literature, “lattice models” appear quite often as mathematical models of physical systems, e.g. Ising model, vertex models, lattice gauge theory. The aim of the 1st part...more
Venue: via Zoom
Event Official Language: English
The Uchuu Simulations: Data Release 1 and Dark Matter Halo Concentrations
October 1 at 14:00 - 15:00, 2020
Dr. Tomoaki Ishiyama (Associate Professor, Institute of Management and Information Technologies)
We introduce the Uchuu suite of large high-resolution cosmological N-body simulations. The largest simulation, named Uchuu, consists of 2.1 trillion dark matter particles in a box of 2.0 Gpc/h. The hi...more
Venue: via Zoom
Event Official Language: English
Public Lecture : Math meets Quantum Materials
September 29 at 19:00 - 20:30, 2020
Prof. Hidetoshi Nishimori
(Senior Visiting Scientist, iTHEMS)
Dr. Tomoki Ozawa
(Visiting Scientist (Academia), iTHEMS)
Public Lecture "Math meets Quantum Materials" for high school students and above will be held. The lecture will introduce the latest topics in mathematics and physics, such as topology and quantum com...more
Venue: via Online
Event Official Language: Japanese
The Second Tohoku University - RIKEN Joint Workshop: "Math Meets Quantum Materials"
September 29 - 30, 2020
Prof. Hidetoshi Nishimori
(Senior Visiting Scientist, iTHEMS)
Dr. Tomoki Ozawa
(Visiting Scientist (Academia), iTHEMS)
Dr. Ching-Kai Chiu
(Senior Research Scientist, iTHEMS)
Dr. Ryusuke Hamazaki
(Senior Research Scientist, iTHEMS)
Dr. Kyosuke Adachi
(Special Postdoctoral Researcher, iTHEMS)
Dr. Christopher Bourne
(Visiting Scientist (Academia), iTHEMS)
The second Tohoku University - RIKEN joint workshop, entitled "Math Meets Quantum Materials," takes place from September 29 - 30. Tohoku University and RIKEN have been holding a series of joint wor...more
Venue: via Online
Event Official Language: English
Fast Radio Bursts: a cosmic mystery
September 28 at 10:30 - 11:00, 2020
Dr. Don Warren (Research Scientist, iTHEMS)
On Monday morning, iTHEMS researcher Don Warren will give a public talk on fast radio bursts. He will describe this cosmic mystery, and reveal how impatient Australians play an important role in the s...more
Venue: via Online
Event Official Language: English
Perspective of nuclear physics in the 21 century
September 27 at 13:30 - 17:00, 2020
Dr. Tetsuo Hatsuda
(Program Director, iTHEMS)
Prof. Hiroyoshi Sakurai
(Director, Nishina Center for Accelerator-Based Science, RIKEN)
Prof. Naohito Saito
(Director, J-PARC Center)
Prof. Takaaki Kajita
(Director, The Institute for Cosmic Ray Research (ICRR), The University of Tokyo)
世界最先端の日本の原子核物理研究を行う4施設の牽引者がそれぞれリレー方式で講義を行います。21世紀の原子核物理学の潮流といえる、重力波や中性子星連星合体など宇宙の謎に迫る高密度世界の解明に関する研究内容から、先端加速器やスーパーコンピューターを用いた最先端の研究スタイルまで、日本が誇る原子核物理学の今と今後の展望をお話します。
Venue: via YouTube Live
Event Official Language: Japanese
Math Seminars by Dr. Genki Ouchi and Dr. Kenta Sato
September 24 at 16:00 - 18:10, 2020
Dr. Genki Ouchi
(Special Postdoctoral Researcher, iTHEMS)
Dr. Kenta Sato
(Special Postdoctoral Researcher, iTHEMS)
[Talk 1] (16:00 - 17:00) Dr. Genki Ouchi Automorphism groups of cubic fourfolds and K3 categories In this talk, I would like to talk about symmetries of algebraic varieties, especially cubic fou...more
Venue: via Zoom
Event Official Language: English
Phase Transitions in Biological Systems
September 23 at 10:00 - 11:00, 2020
Dr. Kyosuke Adachi (Special Postdoctoral Researcher, iTHEMS)
Biological systems are built hierarchically by DNA, proteins, cells, tissues, organs, individuals, etc. Recent experiments have clarified the existence of interesting mesoscale phenomena inside cells,...more
Venue: via Zoom
Event Official Language: English
The 2nd Heidelberg-Kyoto-RIKEN workshop, Medicine and Math
September 18 - 19, 2020
Dr. Tetsuo Hatsuda
(Program Director, iTHEMS)
Prof. Takashi Sakajo
(Senior Visiting Scientist, iTHEMS)
Prof. Motomu Tanaka
(Professor, Heidelberg University / Professor, Center for Integrative Medicine and Physics, Institute for Advanced Study, Kyoto University)
京都大学では、2017年に京大高等研究院(KUIAS)と理化学研究所・数理創造プログラム（iTHEMS）が共同で理研-京大数理科学研究拠点(SUURI-COOL Kyoto)をスタートさせ、2018年にはKUIASに医学物理・医工計測グローバル拠点（CiMPhy）が設立されました。また, 2019年には京大理学研究科附属サイエンス連携探索センター(SACRA)が発足しました。これらは、2015年に...more
Venue: via Online
Event Official Language: Japanese
Eco-evolutionary dynamics with novel mutations
September 16 at 10:00 - 11:00, 2020
Dr. Hye Jin Park (Junior Research Group Leader, Statistical physics of ecology and evolution group, Asia Pacific Center for Theoretical Physics, Korea (the Democratic People's Republic of))
Evolution is driven by individual birth and death that are determined by interactions between individuals. Hence studying interactions is crucial to understand the population evolution. However, tradi...more
Venue: via Zoom
Event Official Language: English
Singular point implies coexistence in adaptive dynamics
September 9 at 10:00 - 11:00, 2020
Dr. Masashi Tachikawa (Visiting Scientist (Academia), iTHEMS)
Adaptive dynamics is a relatively new mathematical framework for studying evolution(~1990s). Under the influence of the mathematical ecology and the game theory, adaptive dynamics considers the effect...more
Venue: via Zoom
Event Official Language: English
Maximal Regularity and Partial Differential Equations.
September 8 at 16:00 - 18:10, 2020
The theory of maximal regularity is a powerful tool to get solutions having the best regularity to linear partial differential equations (PDEs) of parabolic type. The theory is also applicable to show...more
Venue: via Zoom
Event Official Language: English
Potential Toolkit to Attack Nonperturbative Aspects of QFT －Resurgence and related topics－
September 7 - 25, 2020
Dr. Aleksey Cherman
(University of Minnesota, USA)
Prof. Gerald Dunne
(University of Connecticut, USA)
Prof. Mithat Unsal
(North Carolina State University, USA)
Dr. Toshiaki Fujimori
(Keio University)
Dr. Yasuyuki Hatsuda
(Rikkyo University)
Dr. Masazumi Honda
(Kyoto University)
Dr. Okuto Morikawa
(Kyushu University)
Dr. Naohisa Sueishi
(Nagoya University)
Dr. Masahito Yamazaki
(Kavli IPMU / The University of Tokyo)
Recently, there have been significant developments in theoretical techniques/frameworks to tackle non-perturbative aspects of quantum field theory (QFT) such as the resurgence theory, the Lefschetz th...more
Venue: YITP (Kyoto University), Zoom, and Mozilla hubs
Event Official Language: English
The hitch-hiker’s guide to the concept of adaptive dynamics
September 2 at 10:00 - 10:30, 2020
Dr. Ryosuke Iritani (Research Scientist, iTHEMS)
Adaptation is of multi-causality, composed of mutation and selection processes. I will talk about how we model adaptation on the basis of the adaptive dynamics framework. This is a very quick, concept...more
Venue: via Zoom
Event Official Language: English
Geometric Perspective for the Theory of Hydrodynamic Limits
August 31 - September 1, 2020
Dr. Makiko Sasada
(Associate Professor, Graduate School of Mathematical Sciences, The University of Tokyo)
Prof. Kenichi Bannai
(Professor, Faculty of Science and Technology Department of Mathematics, Keio University)
This is a series of lectures on "Geometric Perspectives for Fluid Dynamic Limit Theory" by the following speakers: [DAY 1: Aug 31] Dr. Makiko Sasada (University of Tokyo) [DAY 2: Sept 1] Prof. Kenic...more
Venue: via Zoom
Event Official Language: English
Modeling biological timing
August 26 at 10:00 - 11:00, 2020
Dr. Gen Kurosawa (Senior Research Scientist, iTHEMS)
Under stay-at-home situation, some of you may suffer from sleep disorder. Efficacy of a drug often depends on the timing of its prescription. We know this fact about our "timing", but we don't know wh...more
Venue: via Zoom
Event Official Language: English
Tetsuo Hatsuda × Yoshinori Ohsumi × Sayaka Oki Online Discussion: "The Usefulness of 'Useless' Knowledge" Presented by iTHEMS & academist
August 22 at 13:00 - 15:30, 2020
Dr. Tetsuo Hatsuda
(Program Director, iTHEMS)
Prof. Yoshinori Ohsumi
(Cell Biology Center, Institute of Innovative Research, Tokyo Institute of Technology)
Prof. Sayaka Oki
(Graduate School of Economics, Department of Socio-Economic System, Nagoya University)
学問の世界で大切なのは、研究者の「なぜ」「不思議だな」という好奇心です。研究者は自らの好奇心をもとに想像力を膨らませ、さまざまな仮説を立て、それを実験、観測、調査で検証し、最終的には理論的に体系づけていきます。このような基礎研究で得られた知識は、私たちの生活に直接「役に立つ」ものではありません。しかし、5年、10年といった期間ではなく、100年、1000年単位で考えると、基礎研究は確実に世の中の役...more
Venue: via Zoom
Event Official Language: Japanese
Lefschetz-thimble inspired analysis of the Dykhne–Davis–Pechukas method and an application for the Schwinger Mechanism
August 21 at 13:00 - 14:30, 2020
Dr. Takuya Shimazaki (Researcher, Hadron Theory Group, The University of Tokyo)
Dykhne–Davis–Pechukas (DDP) method is a common approximation scheme for the transition probability in two-level quantum systems, as realized in the Landau–Zener effect, leading to an exponentially dam...more
Venue: via Zoom
Event Official Language: English
Nambu-Goldstone fermion in a Bose-Fermi mixture with an explicitly broken supersymmetry
August 7 at 13:00 - 14:30, 2020
Dr. Hiroyuki Tajima (PhD, Department of Natural Science, Kochi University)
Supersymmetry, which is a symmetry associated with interchange between bosons and fermions, is one of the most important symmetries in high-energy physics but its evidence has never been observed yet....more
Venue: via Zoom
Event Official Language: English
Heavy tails in the brain
August 5 at 10:00 - 11:00, 2020
Dr. Lukasz Kusmierz (research scientist, RIKEN Center for Brain Science)
In my talk I will discuss the relation between two seemingly unrelated measures in the brain that exhibit heavy tails: neuronal avalanches, i.e. bursts of activity with power-law distributions of size...more
Venue: via Zoom
Event Official Language: English
Stability of ferromagnetism in many-electron systems
July 31 at 16:00 - 18:10, 2020
Prof. Tadahiro Miyao (Associate Professor, Department of Mathematics, Faculty of Science, Hokkaido University)
First part Title: Stability of ferromagnetism in many-electron systems Abstract: I construct a model-independent framework describing stabilities of ferromagnetism in strongly correlated electron...more
Venue: via Zoom
Event Official Language: English
Time-dependent bias emerges in population models with broad offspring number distributions
July 29 at 10:00 - 11:00, 2020
Dr. Takashi Okada (Senior Research Scientist, iTHEMS)
It has been increasingly recognized that natural populations exhibit broad offspring number distributions, either because offspring numbers are strongly variable (e.g. marine organisms) or because ran...more
Venue: via Zoom
Event Official Language: English
DMWG special seminar : “The result of the XENON1T experiment and its implications”
July 22 at 15:30 - 17:00, 2020
Dr. Masaki Yamashita (Associate Professor, Cosmic-ray Research Division, Institute for Space–Earth Environmental Research, Nagoya University)
Venue: via Zoom
Event Official Language: Japanese
Human Time vs. Mouse Time in Embryonic Development
July 17 at 16:00 - 17:00, 2020
Dr. Miki Ebisuya (Group Leader, European Molecular Biology Laboratory, Barcelona, Spain)
Different species have different tempos of development: larger animals tend to grow more slowly than smaller animals. My group has been trying to understand the molecular basis of this interspecies di...more
Venue: via Zoom
Event Official Language: English
The 12th MACS colloquium
July 17 at 15:00 - 18:30, 2020
Prof. Yasuaki Hiraoka
(Professor, Institute for Advanced Study, Kyoto University / Team Leader, Center for Advanced Intelligence Project, RIKEN)
Prof. Motomu Tanaka
(Professor, Heidelberg University / Professor, Center for Integrative Medicine and Physics, Institute for Advanced Study, Kyoto University)
15:00〜16:00 「トポロジカルデータ解析：理論と応用」平岡 裕章 博士（京都大学、理化学研究所） 16:15〜17:15 令和2年度 MACS 学生説明会 17:30〜18:30 「臨床医学の課題に切り込む数物科学」田中 求 博士（ハイデルベルク大学、京都大学）
Venue: via Zoom
Event Official Language: Japanese
Topological data analysis from a practical and mathematical perspective
July 15 at 16:00 - 18:10, 2020
Dr. Yuichi Ike (Researcher, Artificial Intelligence, FUJITSU LABORATORIES LTD.)
1. Topological data analysis and its applications In this talk, I will explain some methods in topological data analysis (TDA) and their applications. First I recall persistent homology, which is a ...more
Venue: via Zoom
Event Official Language: English
Application of geometry to protein structure analysis
July 15 at 14:00 - 15:00, 2020
Ms. Haru Negami-Oono (PhD Student, Institute for Biology and Mathematics of Dynamic Cellular Processes, The University of Tokyo)
Geometry is applied in various fields as a method for revealing the structure of data. In this seminar, I will introduce the topological method, fatgraph model, to classify protein structures. I will ...more
Venue: via Zoom
Event Official Language: English
Search for ultralight dark matter with laser interferometric gravitational wave detectors
July 13 at 10:00 - 11:00, 2020
Dr. Yuta Michimura (assistant professor, Department of Physics, The University of Tokyo)
Venue: via Zoom
Event Official Language: English
Complex Langevin study of an attractively interacting two-component Fermi gas in 1D with population imbalance
July 10 at 13:30 - 14:30, 2020
Dr. Shoichiro Tsutsui (Postdoctral Researchers, Quantum Hadron Physics Laboratory, RIKEN)
We investigate an attractively interacting two-component Fermi gas in 1D described by the Gaudin-Yang model with population imbalance. While the Gaudin-Yang model is known as a solvable model based on...more
Venue: via Zoom
Event Official Language: English
Constrained evolution of animal embryogenesis
July 8 at 10:00 - 11:00, 2020
Dr. Yui Uchida (RIKEN Special Postdoctoral Researcher, Laboratory for Multiscale Biosystem Dynamics, RIKEN BDR)
Animals have developed a great variety of morphologies during the course of evolution. Despite this, phylogeny-specific features have sometimes been maintained for hundreds of millions of years, sugge...more
Venue: via Zoom
Event Official Language: English
iTHEMS Science Outreach Workshop 2020
July 3 - 4, 2020
RIKEN iTHEMS, an interdisciplinary Theoretical and Mathematical Sciences Program (RIKEN iTHEMS), was established in November 2016. RIKEN iTHEMS aims to use interdisciplinary methods with a focus on ma...more
Venue: via Zoom
Event Official Language: Japanese
Waveform Analysis of Biological Rhythms
July 1 at 10:00 - 11:00, 2020
Dr. Shingo Gibo (Postdoctoral Researcher, iTHEMS)
Nonlinear oscillatory phenomena often emerge in various systems, for example circadian rhythms in biological systems and acoustic vibrations in engineering. Analysis and control of these oscillatory p...more
Venue: via Zoom
Event Official Language: English
![iTHEMS Intensive Course [5] : "Adaptive strategies of organisms, their mathematical bases" - Evolution of cooperation](https://ithems.riken.jp/storage/app/uploads/public/5ad/382/49b/thumb_152_100_100_0_0_crop.jpg)
iTHEMS Intensive Course [5] : "Adaptive strategies of organisms, their mathematical bases" - Evolution of cooperation
June 26 at 13:30 - 15:00, 2020
Dr. Yoh Iwasa (Senior Advisor, iTHEMS)
Living systems exhibit features distinct from nonliving physical systems: their structure and behaviors appear to be chosen adaptive. They are the outcomes of evolution. Mathematical formalisms develo...more
Venue: via Zoom
Event Official Language: English
![iTHEMS Intensive Course [4] : "Adaptive strategies of organisms, their mathematical bases" - Cancer as a mini-evolutionary process](https://ithems.riken.jp/storage/app/uploads/public/5ee/701/284/thumb_1480_100_100_0_0_crop.jpg)
iTHEMS Intensive Course [4] : "Adaptive strategies of organisms, their mathematical bases" - Cancer as a mini-evolutionary process
June 25 at 15:00 - 16:30, 2020
Dr. Yoh Iwasa (Senior Advisor, iTHEMS)
Living systems exhibit features distinct from nonliving physical systems: their structure and behaviors appear to be chosen adaptive. They are the outcomes of evolution. Mathematical formalisms develo...more
Venue: via Zoom
Event Official Language: English
iTHEMS Intensive Course [3] : "Adaptive strategies of organisms, their mathematical bases" - Masting, synchronized reproduction of trees: Coupled chaotic system
June 25 at 13:30 - 14:30, 2020
Dr. Yoh Iwasa (Senior Advisor, iTHEMS)
Living systems exhibit features distinct from nonliving physical systems: their structure and behaviors appear to be chosen adaptive. They are the outcomes of evolution. Mathematical formalisms develo...more
Venue: via Zoom
Event Official Language: English
Universal Error Bound for Constrained Quantum Dynamics
June 24 at 16:00 - 18:10, 2020
Dr. Ryusuke Hamazaki (Senior Research Scientist, iTHEMS)
In quantum mechanics, the existence of large energy gaps allows us to trace out the degrees of freedom of irrelevant energy scale. Consequently, we can treat a system within a constrained subspace obt...more
Venue: via Zoom
Event Official Language: English
Dark Matter Heating vs. Rotochemical Heating in Old Neutron Stars
June 22 at 16:00 - 17:00, 2020
Prof. Koichi Hamaguchi (Associate professor, School of Science, The University of Tokyo)
*Detailed information about the seminar refer to the email
Venue: via Zoom
Event Official Language: English
iTHEMS Intensive Course [2] : "Adaptive strategies of organisms, their mathematical bases" - Dynamic optimization models for growth and reproduction
June 19 at 13:30 - 15:00, 2020
Dr. Yoh Iwasa (Senior Advisor, iTHEMS)
Living systems exhibit features distinct from nonliving physical systems: their structure and behaviors appear to be chosen adaptive. They are the outcomes of evolution. Mathematical formalisms develo...more
Venue: via Zoom
Event Official Language: English
iTHEMS Intensive Course [1] : "Adaptive strategies of organisms, their mathematical bases" - Sex expression and sex allocation of marine organisms
June 18 at 13:30 - 15:00, 2020
Dr. Yoh Iwasa (Senior Advisor, iTHEMS)
Living systems exhibit features distinct from nonliving physical systems: their structure and behaviors appear to be chosen adaptive. They are the outcomes of evolution. Mathematical formalisms develo...more
Venue: via Zoom
Event Official Language: English
Information geometry of operator scaling
June 17 at 16:00 - 18:10, 2020
Dr. Tasuku Soma (Research Associate, Graduate School of Information Science and Technology, The University of Tokyo)
Matrix scaling is a classical problem with a wide range of applications. It is known that the Sinkhorn algorithm for matrix scaling is interpreted as alternating e-projections from the viewpoint of cl...more
Venue: via Zoom
Event Official Language: English
Field theoretical approach to relativistic hydrodynamics
June 12 at 13:00 - 14:30, 2020
Dr. Masaru Hongo (Visiting Scientist (Academia), iTHEMS)
Hydrodynamics is a low-energy effective theory of a conserved charge density, which describes a long-distance and long-time behavior of many-body systems. It is applicable not only to a non-relativist...more
Event Official Language: English
The effect of the early kinetic decoupling in a fermionic dark matter model
June 12 at 10:00 - 11:00, 2020
Dr. Tomohiro Abe (Assistant Professor, Division of Theoretical Studies, Kobayashi-Maskawa Institute for the Origin of Particles and the Universe (KMI), Nagoya University)
*Detailed information about the seminar refer to the email
Venue: via Zoom
Event Official Language: English
Turing Patterns in Biology and Beyond
June 10 at 10:00 - 10:45, 2020
Dr. Martin Skrodzki (Visiting Researcher, iTHEMS)
In his 1952 paper "The chemical basis of morphogenesis", Alan M. Turing presented a model for the formation of skin patterns. While it took several decades, the model has been validated, e.g. in the s...more
Venue: via Zoom
Event Official Language: English
Quantification model of energy of loop structure on biopolymer
June 3 at 10:00 - 10:45, 2020
Dr. Hiroshi Yokota (Postdoctoral Researcher, iTHEMS)
During cell division, the chromatin fiber condenses into a rod-like shape, which is the so-called chromosome. The chromosome is constructed by consecutive chromatin loop structures whose excluded volu...more
Venue: via Zoom
Event Official Language: English
Localization and universality in non-Hermitian many-body systems
May 29 at 15:00 - 16:30, 2020
Dr. Ryusuke Hamazaki (Senior Research Scientist, iTHEMS)
Recent study on isolated quantum many-body systems have revealed two different phases distinguished by their dynamics and spectral statistics. One is an ergodic phase whose spectral statistics exhibit...more
Venue: via Zoom
Event Official Language: English
Knotted 2-spheres in the 4-space and Yang-Mills gauge theory
May 27 at 16:00 - 18:10, 2020
Dr. Masaki Taniguchi (Special Postdoctoral Researcher, iTHEMS)
The classification problem of knots is one of the central topics in a study of topology. In the first part, we review classical knot theory and theory of 2-dimensional knots in the 4-dimensional space...more
Venue: via Zoom
Event Official Language: English
Forgetting in Reinforcement Learning Links Sustained Dopamine Signals to Motivation
May 27 at 10:00 - 10:45, 2020
Ms. Ayaka Kato (RIKEN-CBS / Ph.D. student, The University of Tokyo)
Dopamine (DA) has been suggested to have two reward-related roles: (1) representing reward-prediction-error (RPE), and (2) providing motivational drive. Role(1) is based on the physiological results t...more
Venue: via Zoom
Event Official Language: English
Gradient Flow Equation and Its Applications
May 15 at 13:30 - 15:00, 2020
Dr. Kengo Kikuchi (Special Postdoctoral Researcher, iTHEMS)
Gradient flow is the one of the methods to suppress the ultraviolet divergence in gauge theories. The any correlation functions in terms of the flowed field, which is defined by the gradient flow equa...more
Venue: via Zoom
Event Official Language: English
How many electrons can atoms bind?
May 13 at 16:00 - 18:10, 2020
Dr. Yukimi Goto (Special Postdoctoral Researcher, iTHEMS)
In this talk, I will introduce the mathematical studies on the ionization problem. Some experimental & numerical evidences say that any doubly charged atomic ion X^{2-} is not stable. This 'fact' is c...more
Venue: via Zoom
Event Official Language: English
Models to describe how virus spreads in vitro
May 13 at 10:00 - 10:45, 2020
Prof. Catherine Beauchemin (Senior Visiting Scientist, iTHEMS)
This is meant as an introductory talk about my research field, virophysics, in which I apply the rigour and methods of physics to study virology. My focus is primarily in vitro (how virus spreads cell...more
Venue: via Zoom
Event Official Language: English
Emergence of life in an inflationary universe
May 11 at 15:30 - 17:00, 2020
Dr. Tomonori Totani (Professor, Department of Astronomy, The University of Tokyo)
Venue: via Zoom
Event Official Language: English
Slip or (k)not: Geometry and mechanical performance of physical knots
May 7 at 17:00 - 17:45, 2020
Dr. Tomohiko Sano (PD, École polytechnique fédérale de Lausanne, Switzerland)
Knots can impart unique mechanical function to filamentary structures, with examples ranging across length scales, including DNA, polymer-chains, shoelaces, climbing ropes, tennis racket, and surgical...more
Venue: via Zoom
Event Official Language: English
From Eigenvalues to Resonances
May 1 at 16:00 - 18:10, 2020
Dr. Keita Mikami (Research Scientist, iTHEMS)
Resonance is one of the most studied object in mathematical study of Schrödinger operators. One possible reason is that resonance is appeared in many other fields like arithmetic, physics, and topogra...more
Venue: via zoom
Event Official Language: English
Analyses of large-scale sequence data from “PROTIST” can reveal the eukaryotic phylogeny and evolution
April 30 at 10:00 - 10:45, 2020
Dr. Yuki Yazaki (Postdoctoral Researcher, iTHEMS)
Most of the phylogenetic diversity of eukaryotes is made up of unicellular eukaryotic microorganisms called protists, some of which have not known phylogenetic home (called Orphans). Orphans are likel...more
Venue: via zoom
Event Official Language: English
Characterizing the continuous gravitational-wave signal from boson clouds around Galactic isolated black holes
April 27 at 16:00 - 17:00, 2020
Dr. Sylvia Zhu (Postdoctoral Researcher, Deutsches Elektronen-Synchrotron DESY, Germany)
Bosons such as axions or axion-like particles can form enormous clouds around black holes via the superradiance instability. As the bosons annihilate in the presence of the black hole, they produce a ...more
Venue: via Zoom
Event Official Language: English
Social evolution in viruses
April 22 at 10:00 - 10:45, 2020
Mr. Asher Leeks (International Program Associate, iTHEMS)
Viruses are normally thought of as solitary organisms. However, in reality viruses often interact with one another, and these interactions can have important consequences for how viruses evolve and ca...more
Venue: via Zoom
Event Official Language: English
iTHEMS x academist Online open to the public "Mathematical science world"
April 18 at 10:00 - 17:00, 2020
Dr. Yuki Yokokura
(Senior Research Scientist, iTHEMS)
Dr. Ryosuke Iritani
(Research Scientist, iTHEMS)
Dr. Hirotaka Irie
(Visiting Scientist (Industry), iTHEMS)
Dr. Nagisa Hiroshima
(Visiting Scientist (Academia), iTHEMS)
Dr. Hiroyasu Miyazaki
(Special Postdoctoral Researcher, iTHEMS)
Dr. Akinori Tanaka
(Senior Research Scientist, iTHEMS)
iTHEMSでは「数学」を共通言語として、物理、生物、宇宙などさまざまな科学分野の横断的な研究をしています。「数理で読み解く科学の世界」では、Web会議サービス「Zoom」を利用し、iTHEMS所属の若手研究者6名がそれぞれ一般の方々を対象に、最先端の研究に関する30分の講演をオンラインで行います。また、一般参加者からの質問やコメントも受け付けます。 参加費：無料 途中参加・退出OK ...more
Venue: Register at the link below to participate.
Event Official Language: Japanese
Interaction Models in Quantum Optics, Representation Theory and Number Theory
April 10 at 15:30 - 17:00, 2020
Dr. Masato Wakayama (Senior Advisor, iTHEMS)
Event Official Language: English
iTHEMS Starter Meeting 2020
April 10 at 12:30 - 13:30, 2020
iTHEMS Starter Meeting 2020 will be held from 12:30 with Zoom streaming.
Event Official Language: English
Holography from field theories: a realization of AdS/CFT correspondence and beyond
March 18 at 13:30 - 14:30, 2020
Dr. Shinya Aoki (Professor, Yukawa Institute for Theoretical Physics, Kyoto University)
*Seminar room changed from 160 to 433. We argue that the Anti-de-Sitter (AdS) geometry in $d+1$ dimensions naturally emerges from an arbitrary conformal field theory in $d$ dimensions using the fre...more
Venue: #433, Main Research Building
Event Official Language: Japanese
Index of the Wilson-Dirac operator revisited: a discrete version of Dirac operator on a finite lattice
February 25 at 16:00 - 18:10, 2020
Dr. Mikio Furuta (Professor, The University of Tokyo)
Venue: Seminar Room #160
Event Official Language: English
The 11th MACS colloquium
February 19 at 15:00 - 17:30, 2020
Prof. Hiroyuki Hata (Professor, Graduate School of Science, Kyoto University)
15:00 ティータイム 15:15 弦の場の理論とその数理 畑 浩之氏 （理学研究科 物理学・宇宙物理学専攻 教授） 16:40 2019年度MACS成果報告会 The 11th MACS colloquium is supported by iTHEMS. It will be broadcasted to Wako, but if you can join the coll...more
Venue: Lecture room #401, Graduate School of Science Building No 6, Kyoto University
Event Official Language: Japanese
Mining for Dark Matter substructure: Learning from lenses without a likelihood
February 17 at 14:00 - 15:30, 2020
Dr. Johann Brehmer (Postdoctoral Researcher, New York University)
Dr. Brehmer gives us a talk about a method to deduce DM small structures. Please join us!
Venue: #424-426, Main Research Building
Event Official Language: English
Solved and open problems regarding the neighborhood grid data structure
February 7 at 16:00 - 18:10, 2020
Dr. Martin Skrodzki (Visiting Researcher, iTHEMS)
February 7 at 16:00-17:00 17:10-18:10, 2020
Venue: Seminar Room #160
Event Official Language: English
Biology Talk
February 5 at 16:00 - 16:30, 2020
Dr. Yasuo Yasui (Assistant Professor, Laboratory of Crop Evolution, Kyoto University)
Dr. Yasuo Yasui will give a 20-30 min introduction of the buckwheat project. Please feel free to join !
Venue: #160, 1F, Main Research Building
Event Official Language: Japanese
ABBL/iTHEMS seminar - talk on ultra-high energy cosmic rays
January 31 at 14:00 - 15:00, 2020
Dr. Eiji Kido (Astrophysical Big Bang Laboratory, RIKEN)
Venue: Seminar Room #132
Event Official Language: English
Nucleon Structure from Quantum Chromodynamics
January 30 at 11:00 - 12:00, 2020
Dr. Chia Cheng Chang (Research Scientist, iTHEMS)
Talk of this seminar is a colloquium style, so that non-expert can enjoy. Please feel free to join.
Venue: #433, Main Research Building
Event Official Language: English
Workshop on quantum information science
January 29 at 10:00 - 18:00, 2020
Venue: Suzuki Umetaro Hall
Event Official Language: Japanese
CREST Tutorial Workshop
January 26 - 28, 2020
This workshop is co-organized by CREST Research Project "[Topology] Creation of Core Technology based on the Topological Materials Science for Innovative Devices" and RIKEN iTHEMS.
Venue: Graduate School of Mathematical Sciences, The University of Tokyo
Event Official Language: Japanese
ABBL/iTHEMS seminar - talk on neutron stars
January 24 at 14:00 - 15:00, 2020
Dr. Hajime Sotani (Research Scientist, iTHEMS)
Venue: Seminar Room #132
Event Official Language: English
Semiclassical methods in mathematical quantum mechanics
January 23 at 16:00 - 18:10, 2020
Dr. Shu Nakamura (Professor, Gakushuin University)
Plan of the seminar: we separate each talk into two. In the first 60 minutes the speaker gives an introductory talk for non-mathematicians. After a short break, the second 60 minutes is spent for a b...more
Venue: #435-437, Main Research Building
Event Official Language: English
Exploring the learning principle in the brain
January 16 at 15:30 - 17:00, 2020
Dr. Taro Toyoizumi (Team Leader, Center for Brain Science, RIKEN)
Venue: Large Meeting Room, 2F Welfare and Conference Building (Cafeteria)
Broadcast: R311, Computational Science Research Building / SUURI-COOL (Kyoto) / SUURI-COOL (Sendai)
Event Official Language: English
Tipping point detection of nonlinear dynamics by dynamic network biomarkers, and short-term time-series data prediction by randomly distributed embedding
January 15 at 14:00 - 16:30, 2020
Dr. Luonan Chen (Professor, Excutive director, Chinese Academy of Sciences, China)
He will talk about theoretical study on complex network data, including clinical data. His talk consists of two parts: 14:00-15:00: Detecting the tipping points of dynamic processes by dynamic ne...more
Venue: Large Meeting Room, 2F Welfare and Conference Building (Cafeteria)
Event Official Language: English
Particle acceleration in young supernova remnants with X-ray and gamma-ray observations
January 9 at 10:00 - 11:00, 2020
Dr. Naomi Tsuji
Venue: Seminar Room #160
Event Official Language: English