Math Seminar
Scattering theory for half-line Schrödinger operators: analytic and topological results
December 7 at 16:00 - 18:10, 2020
Dr. Hideki Inoue (Nagoya University)
Levinson’s theorem is a surprising result in quantum scattering theory, which relates the number of bound states and the scattering part of the underlying quantum system. For the last about ten years,...more
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
Multiple Zeta Values: Interrelation of Series and Integrals
December 17 at 16:00 - 18:10, 2019
Prof. Syuji Yamamoto (Associate Professor, Keio 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: Seminar Room #160
Event Official Language: English
Noncommutative crepant resolutions and some higher dimensional flops
December 4 at 16:00 - 18:10, 2019
Dr. Wahei Hara (JSPS Research Fellow, School of Science and Engineering, Waseda 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: Seminar Room #160
Event Official Language: English
Some topics in projective geometry of algebraic varieties
November 8 at 16:00 - 18:10, 2019
Dr. Atsushi Ito (Assistant Professor, Nagoya 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: Seminar Room #160
Event Official Language: English