Seminar

Information Theory Study Group

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

Seminar

Math Seminar

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

Seminar

Biology Seminar

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

Colloquium

iTHEMS Colloquium Supported by RIKEN SUURI CORPORATION

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

Seminar

Biology Seminar

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

Seminar

Math Seminar

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

Seminar

Math Seminar

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

Colloquium

MACS Colloquium Supported by iTHEMS SUURI-COOL (Kyoto)

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

Seminar

iTHEMS theoretical physics seminar

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

Seminar

Math-Phys Joint Seminar

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

Seminar

Math Seminar

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

Seminar

Biology Seminar

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

External Event

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

External Event

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

Seminar

Biology Seminar

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

Seminar

iTHEMS theoretical physics seminar

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

Seminar

iTHEMS theoretical physics seminar

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

External Event

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

Seminar

Biology Seminar

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

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

Seminar

DMWG seminar

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

Symposium

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

Seminar

Biology Seminar

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

External Event

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

Lecture

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

Seminar

Math-Phys Joint Seminar

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

Seminar

DMWG seminar

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

External Event

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

External Event

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

External Event

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

External Event

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

Seminar

Math Seminar

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

Seminar

Biology Seminar

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

Workshop

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

Seminar

Biology Seminar

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

Seminar

Biology Seminar

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

Seminar

Math Seminar

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

Seminar

STAMP Seminar

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

Seminar

Biology Seminar

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

Seminar

Math-Phys Joint Seminar

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

Seminar

Biology Seminar

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

Special Lecture

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

Seminar

iTHEMS theoretical physics seminar

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

Seminar

iTHEMS theoretical physics seminar

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

Seminar

Biology Seminar

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

Seminar

Math Seminar

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

Seminar

Biology Seminar

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

Seminar

DMWG seminar

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

Seminar

Biology Seminar

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

Colloquium

MACS Colloquium Supported by iTHEMS SUURI-COOL (Kyoto)

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

Seminar

Math Seminar

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

Seminar

Biology Seminar

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

Seminar

DMWG seminar

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

Seminar

iTHEMS theoretical physics seminar

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

Seminar

Biology Seminar

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

Workshop

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

Seminar

Biology Seminar

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

Special Lecture

iTHEMS Intensive Course-Evolution of cooperation

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

Colloquium

iTHEMS Colloquium

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

Special Lecture

iTHEMS Intensive Course-Evolution of cooperation

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

Seminar

Math Seminar

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

Seminar

DMWG seminar

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

Special Lecture

iTHEMS Intensive Course-Evolution of cooperation

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

Special Lecture

iTHEMS Intensive Course-Evolution of cooperation

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

Seminar

Math Seminar

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

Seminar

iTHEMS theoretical physics seminar

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

Seminar

DMWG seminar

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

Seminar

Biology Seminar

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

Seminar

Biology Seminar

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

Seminar

QFT-core Seminar

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

Seminar

Math Seminar

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

Seminar

Biology Seminar

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

Seminar

QFT-core Seminar

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

Seminar

Math Seminar

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

Seminar

Biology Seminar

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

Colloquium

iTHEMS Colloquium

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

Seminar

Biology Seminar

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

Seminar

Math Seminar

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

Seminar

Biology Seminar

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

Seminar

DMWG seminar

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

Seminar

Biology Seminar

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

Special Lecture

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

Colloquium

iTHEMS Colloquium

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

Seminar

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

Seminar

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

Seminar

Math Seminar

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

Colloquium

MACS Colloquium Supported by iTHEMS SUURI-COOL (Kyoto)

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

Seminar

DMWG seminar

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

Seminar

Math Seminar

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

Seminar

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

Seminar

ABBL-iTHEMS Joint Seminar

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

Seminar

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

Workshop on quantum information science

January 29 at 10:00 - 18:00, 2020

Venue: Suzuki Umetaro Hall

Event Official Language: Japanese

Workshop

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

Seminar

ABBL-iTHEMS Joint Seminar

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

Seminar

Math Seminar

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

Colloquium

iTHEMS Colloquium

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

Seminar

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

Seminar

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