Seminar

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

N-body simulation of DM halo

October 1 at 14:00 - 15:00, 2020

Dr. Tomoaki Ishiyama (Associate Professor, Institute of Management and Information Technologies)

Venue: via Zoom

Event Official Language: English

Seminar

Tomorrow

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

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

Dr. Ken Furukawa (Special Researcher, Prediction Science Laboratory, RIKEN)

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

In Session

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

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

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