Lectures

Seminar information archive ~05/28Next seminarFuture seminars 05/29~


Seminar information archive

2023/08/08

14:00-15:00   Room #123 (Graduate School of Math. Sci. Bldg.)
Dror Bar-Natan (University of Toronto)
Cars, Interchanges, Traffic Counters, and some Pretty Darned Good Knot Invariants (English)
[ Abstract ]
Reporting on joint work with Roland van der Veen, I'll tell you some stories about ρ_1, an easy to define, strong, fast to compute, homomorphic, and well-connected knot invariant. ρ_1 was first studied by Rozansky and Overbay, it is dominated by the coloured Jones polynomial (but it isn't lesser!), it has far-reaching generalizations, and I wish I understood it.
[ Reference URL ]
http://www.math.toronto.edu/~drorbn/Talks/Tokyo-230808/

2023/08/08

15:30-16:30   Room #123 (Graduate School of Math. Sci. Bldg.)
Dror Bar-Natan (University of Toronto)
Shifted Partial Quadratics, their Pushwards, and Signature Invariants for Tangles (English)
[ Abstract ]
Following a general discussion of the computation of zombians of unfinished columbaria (with examples), I will tell you about my recent joint work with Jessica Liu on what we feel is the "textbook" extension of knot signatures to tangles, which for unknown reasons, is not in any of the textbooks that we know.
[ Reference URL ]
http://www.math.toronto.edu/~drorbn/Talks/Tokyo-230808/

2023/02/09

15:00-16:30   Room #122 (Graduate School of Math. Sci. Bldg.)
Stefano Olla (Dauphine大学)
Diffusive behavior in completely integrable infinite dynamics (English)
[ Abstract ]
We investigate the macroscopic behaviour of the density fluctuations of a one dimensional dynamics of hard rods with random length. After recentering on the effective velocity the density fluctuations of particles of a given velocity v will evolve on the diffusive scaling driven by a brownian motion with a diffusivity depending on v. This rigid evolution of fluctuations is expected in other completely integrable systems (Box-Ball, Toda Lattice,..), in contrast with the behavior in chaotic dynamics.
Joint work with Pablo Ferrari (U. Buenos Aires).

2023/01/12

16:00-17:00   Online
Prof. Yi-Hsuan Lin (National Yang Ming Chiao Tung University, Taiwan)
The Calder'on problem for nonlocal parabolic operators (English)
[ Abstract ]
We investigate inverse problems in the determination of leading coefficients for nonlocal parabolic operators, by knowing the corresponding Cauchy data in the exterior space-time domain. The key contribution is that we reduce nonlocal parabolic inverse problems to the corresponding local inverse problems with the lateral boundary Cauchy data. In addition, we derive a new equation and offer a novel proof of the unique continuation property for this new equation. We also build both uniqueness and non-uniqueness results for both nonlocal isotropic and anisotropic parabolic Calder'on problems, respectively.
This is a joint work with Ching-Lung Lin and Gunther Uhlmann.
[ Reference URL ]
https://u-tokyo-ac-jp.zoom.us/j/82806510515?pwd=NEk1RDlMVEFOTEg4WE1MekRySlJpdz09

2023/01/10

16:00-17:00   Online
Professor Salah-Eddine CHORFI (Cadi Ayyad University, Faculty of Sciences, Morocco)
Logarithmic convexity of semigroups and inverse problems for parabolic equations (English)
[ Reference URL ]
https://u-tokyo-ac-jp.zoom.us/j/83149935801?pwd=OE5aanNBVGxvajNycXgyb2RKcW1kZz09

2023/01/04

17:00-18:00   Online
Professor Debora Presti (Messina University)
On the source of the catastrophic 1908 Messina tsunami, southern Italy (English)
[ Reference URL ]
https://u-tokyo-ac-jp.zoom.us/j/81296515694?pwd=dlNZY2dZWDRENmdscjRWcFM1MjRCQT09

2022/12/27

16:00-17:00   Online
Professor Salah-Eddine CHORFI (Cadi Ayyad University, Faculty of Sciences, Morocco)
Controllability and inverse problems for parabolic equations with dynamic boundary conditions. (English)
[ Reference URL ]
https://u-tokyo-ac-jp.zoom.us/j/83149935801?pwd=OE5aanNBVGxvajNycXgyb2RKcW1kZz09

2022/11/17

11:00-12:30   Online
Seminars by Professor O. Emanouilov (Colorado State Univ.)
Professor O. Emanouilov (Colorado State Univ.)
Inverse problems for partial differential equations: past and future works (English)
[ Reference URL ]
https://u-tokyo-ac-jp.zoom.us/j/88649482949?pwd=Yk9sNzJDNmNmZlRDeXAvcFFtcUkzUT09

2022/11/10

11:00-12:30   Online
Seminars by Professor O. Emanouilov (Colorado State Univ.)
Professor O. Emanouilov (Colorado State Univ.)
Inverse problems for partial differential equations: past and future works (English)
[ Reference URL ]
https://u-tokyo-ac-jp.zoom.us/j/88649482949?pwd=Yk9sNzJDNmNmZlRDeXAvcFFtcUkzUT09

2022/11/03

11:00-12:30   Online
Seminars by Professor O. Emanouilov (Colorado State Univ.)
Professor O. Emanouilov (Colorado State Univ.)
Inverse problems for partial differential equations: past and future works (English)
[ Reference URL ]
https://u-tokyo-ac-jp.zoom.us/j/88649482949?pwd=Yk9sNzJDNmNmZlRDeXAvcFFtcUkzUT09

2022/10/27

11:00-12:30   Online
Seminars by Professor O. Emanouilov (Colorado State Univ.)
Professor O. Emanouilov (Colorado State Univ.)
Inverse problems for partial differential equations: past and future works (English)
[ Reference URL ]
https://u-tokyo-ac-jp.zoom.us/j/88649482949?pwd=Yk9sNzJDNmNmZlRDeXAvcFFtcUkzUT09

2022/10/19

16:45-18:15   Room #126 (Graduate School of Math. Sci. Bldg.)
If you wish to participate online, please register by 17:00 on the 18th from the reference URL.
Mykhaylo Shkolnikov (Princeton University)
Probabilistic solutions of singular free boundary problems (English)
[ Abstract ]
The main focus of the talk will be on a new, probabilistic, concept of solution to singular free boundary problems, in which boundary points may move at infinite speed. I will discuss this new concept in the context of Stefan problems from mathematical physics that describe melting/solidification of a solid/liquid (e.g., ice/water) in the presence of supercooling. In particular, I will present new global existence, regularity and uniqueness results for the two geometrically simplest settings: flat and radial. Based on joint works with Sergey Nadtochiy, Francois Delarue and Yucheng Guo.
[ Reference URL ]
https://forms.gle/XXH2cAb18pQhC6w96

2022/09/16

16:00-17:30   Online
Seminars by Professor Emanouilov
Professor O. Emanouilov (Colorado State Univ.)
Prospects
[ Reference URL ]
https://u-tokyo-ac-jp.zoom.us/j/81167784080?pwd=VE94RnNYcmJZUXJ4QTIvZUhEQmVJZz09

2022/09/15

16:00-17:30   Online
Seminars by Professor Emanouilov
Professor O. Emanouilov (Colorado State Univ.)
Inverse problems for fluid dynamics
[ Reference URL ]
https://u-tokyo-ac-jp.zoom.us/j/81167784080?pwd=VE94RnNYcmJZUXJ4QTIvZUhEQmVJZz09

2022/09/09

16:00-17:30   Online
Seminars by Professor Emanouilov
Professor O. Emanouilov (Colorado State Univ.)
Inverse parabolic problems: recent results
[ Reference URL ]
https://u-tokyo-ac-jp.zoom.us/j/83144151309?pwd=NEIwbzdGNU5xcFR2UTFWbnZlOW5pUT09

2022/09/08

16:00-17:30   Online
Seminars by Professor Emanouilov
Professor O. Emanouilov (Colorado State Univ.)
Inverse parabolic problems: recent results
[ Reference URL ]
https://u-tokyo-ac-jp.zoom.us/j/83144151309?pwd=NEIwbzdGNU5xcFR2UTFWbnZlOW5pUT09

2022/09/02

16:00-17:30   Online
Seminars by Professor Emanouilov
Professor O. Emanouilov (Colorado State Univ.)
DN map for hyperbolic inverse problems
[ Reference URL ]
https://u-tokyo-ac-jp.zoom.us/j/83144151309?pwd=NEIwbzdGNU5xcFR2UTFWbnZlOW5pUT09

2022/09/01

16:00-17:30   Online
Seminars by Professor Emanouilov
Professor O. Emanouilov (Colorado State Univ.)
DN map for hyperbolic inverse problems
[ Reference URL ]
https://u-tokyo-ac-jp.zoom.us/j/83144151309?pwd=NEIwbzdGNU5xcFR2UTFWbnZlOW5pUT09

2022/08/26

16:00-17:30   Online
Seminars by Professor Emanouilov
Professor O. Emanouilov (Colorado State University)
Recent researches on inverse problems by Carleman estimatesPart II + discussions on new aspects of mathematical analysis for inverse problems
[ Reference URL ]
https://u-tokyo-ac-jp.zoom.us/j/81424491417?pwd=T1BOMWtmZkhtY0pjUEs1NFZUZEYzQT09

2022/08/25

16:00-17:30   Online
Seminars by Professor Emanouilov
Professor O. Emanouilov (Colorado State University )
Recent researches on inverse problems by Carleman estimates Part I
[ Reference URL ]
https://u-tokyo-ac-jp.zoom.us/j/81424491417?pwd=T1BOMWtmZkhtY0pjUEs1NFZUZEYzQT09

2021/03/19

18:00-19:00   Online
Day 3 of a series of three lectures (3/17,18,19)
Matthew Morrow (CNRS, IMJ-PRG)
Progress in syntomic cohomology (ENGLISH)
[ Abstract ]
The talks will present a survey of the (quasi)syntomic cohomology theory introduced by Bhatt, Scholze, and the speaker; this provides a variant of the syntomic cohomology of Fontaine, Kato, and Messing which has the advantage of being defined in a greater degree of generality and working well with torsion coefficients even for small primes. Although it underlies in principle a general theory of p-adic étale motivic cohomology, the talks will probably focus more on arithmetic aspects such as applications in p-adic Hodge theory. Based on various projects joint with Antieau, Bhatt, Clausen, Kelly, Lüders, Mathew, Nikolaus, and Scholze.
[ Reference URL ]
https://www.ms.u-tokyo.ac.jp/~shiho/spparis/index.html

2021/03/18

17:30-18:30   Online
Day 2 of a series of three lectures (3/17,18,19)
Matthew Morrow (CNRS, IMJ-PRG)
Progress in syntomic cohomology (ENGLISH)
[ Abstract ]
The talks will present a survey of the (quasi)syntomic cohomology theory introduced by Bhatt, Scholze, and the speaker; this provides a variant of the syntomic cohomology of Fontaine, Kato, and Messing which has the advantage of being defined in a greater degree of generality and working well with torsion coefficients even for small primes. Although it underlies in principle a general theory of p-adic étale motivic cohomology, the talks will probably focus more on arithmetic aspects such as applications in p-adic Hodge theory. Based on various projects joint with Antieau, Bhatt, Clausen, Kelly, Lüders, Mathew, Nikolaus, and Scholze.
[ Reference URL ]
https://www.ms.u-tokyo.ac.jp/~shiho/spparis/index.html

2021/03/17

17:30-18:30   Online
Day 1 of a series of three lectures (3/17,18,19)
Matthew Morrow (CNRS, IMJ-PRG)
Progress in syntomic cohomology (ENGLISH)
[ Abstract ]
The talks will present a survey of the (quasi)syntomic cohomology theory introduced by Bhatt, Scholze, and the speaker; this provides a variant of the syntomic cohomology of Fontaine, Kato, and Messing which has the advantage of being defined in a greater degree of generality and working well with torsion coefficients even for small primes. Although it underlies in principle a general theory of p-adic étale motivic cohomology, the talks will probably focus more on arithmetic aspects such as applications in p-adic Hodge theory. Based on various projects joint with Antieau, Bhatt, Clausen, Kelly, Lüders, Mathew, Nikolaus, and Scholze.
[ Reference URL ]
https://www.ms.u-tokyo.ac.jp/~shiho/spparis/index.html

2020/01/10

10:00-11:30   Room #126 (Graduate School of Math. Sci. Bldg.)
Javier Fresan (Ecole Polytechnique)
Nori motives over function fields and period functions (ENGLISH)
[ Abstract ]
Around twenty years ago, Nori introduced a tannakian category of mixed motives over a subfield of the complex numbers, thus giving the first unconditional construction of the motivic Galois group. In this series of lectures, I will first survey on Nori's theory and its relationship to other categories of motives. I will then explain how to extend his construction to functions fields and why the resulting tannakian group governs
algebraic relations between period functions.
This last part is based on an ongoing work with Peter Jossen.

2020/01/09

14:00-17:30   Room #126 (Graduate School of Math. Sci. Bldg.)
Javier Fresan (Ecole Polytechnique)
Nori motives over function fields and period functions (ENGLISH)
[ Abstract ]
Around twenty years ago, Nori introduced a tannakian category of mixed motives over a subfield of the complex numbers, thus giving the first unconditional construction of the motivic Galois group. In this series of lectures, I will first survey on Nori's theory and its relationship to other categories of motives. I will then explain how to extend his construction to functions fields and why the resulting tannakian group governs
algebraic relations between period functions.
This last part is based on an ongoing work with Peter Jossen.

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