## Seminar information archive

Seminar information archive ～09/14｜Today's seminar 09/15 | Future seminars 09/16～

### 2012/02/14

#### Tuesday Seminar of Analysis

16:30-18:00 Room #128 (Graduate School of Math. Sci. Bldg.)

Symmetry results for Caffarelli-Kohn-Nirenberg inequalities (ENGLISH)

**Michael Loss**(Georgia Institute of Technology)Symmetry results for Caffarelli-Kohn-Nirenberg inequalities (ENGLISH)

### 2012/02/07

#### GCOE Seminars

14:00-15:00 Room #370 (Graduate School of Math. Sci. Bldg.)

Controllability results for degenerate parabolic operators (ENGLISH)

**Piermarco Cannarsa**(Mat. Univ. Roma "Tor Vergata")Controllability results for degenerate parabolic operators (ENGLISH)

[ Abstract ]

UnlikeCuniformly parabolic equations, parabolic operators that degenerate on subsets of the space domain exhibit very different behaviors from the point of view of controllability. For instance, null controllability in arbitrary time may be true or false according to the degree of degeneracy, and there are also examples where a finite time is needed to ensure such a property. This talk will survey most of the theory that has been established so far for operators with boundary degeneracy, and discuss recent results for operators of Grushin type which degenerate in the interior.

UnlikeCuniformly parabolic equations, parabolic operators that degenerate on subsets of the space domain exhibit very different behaviors from the point of view of controllability. For instance, null controllability in arbitrary time may be true or false according to the degree of degeneracy, and there are also examples where a finite time is needed to ensure such a property. This talk will survey most of the theory that has been established so far for operators with boundary degeneracy, and discuss recent results for operators of Grushin type which degenerate in the interior.

### 2012/02/03

#### thesis presentations

09:45-11:00 Room #118 (Graduate School of Math. Sci. Bldg.)

How to estimate Seshadri constants(セシャドリ定数を評価する方法)

(JAPANESE)

**Atsushi ITO**(Graduate School of Mathematical Sciences University of Tokyo)How to estimate Seshadri constants(セシャドリ定数を評価する方法)

(JAPANESE)

#### thesis presentations

11:00-12:15 Room #118 (Graduate School of Math. Sci. Bldg.)

Spherical functions associated to the principal series representations of SL(3,R) and higher rank Epstein zeta functions(SL(3,R)の主系列表現に付随する球関数,及び高階Epsteinゼータ関数について)

(JAPANESE)

**Keijyu SONO**(Graduate School of Mathematical Sciences University of Tokyo)Spherical functions associated to the principal series representations of SL(3,R) and higher rank Epstein zeta functions(SL(3,R)の主系列表現に付随する球関数,及び高階Epsteinゼータ関数について)

(JAPANESE)

#### thesis presentations

13:00-14:15 Room #118 (Graduate School of Math. Sci. Bldg.)

Construction of invariant group orderings from topological point of view(位相幾何の視点からの群の不変順序の構成)

(JAPANESE)

**Tetsuya ITO**(Graduate School of Mathematical Sciences University of Tokyo)Construction of invariant group orderings from topological point of view(位相幾何の視点からの群の不変順序の構成)

(JAPANESE)

#### thesis presentations

14:15-15:30 Room #118 (Graduate School of Math. Sci. Bldg.)

The explicit calculation of Čech cohomology and an extension of Davenport’s inequality(Čechコホモロジーの明示的計算とDavenport不等式の拡張)

(JAPANESE)

**TIAN Ran**(Graduate School of Mathematical Sciences University of Tokyo)The explicit calculation of Čech cohomology and an extension of Davenport’s inequality(Čechコホモロジーの明示的計算とDavenport不等式の拡張)

(JAPANESE)

#### thesis presentations

09:45-11:00 Room #128 (Graduate School of Math. Sci. Bldg.)

Hybridized Discontinuous Galerkin Methods for Elliptic Problems(楕円型問題に対するハイブリッド型不連続ガレルキン法の研究)

(JAPANESE)

**Issei OIKAWA**(Graduate School of Mathematical Sciences University of Tokyo)Hybridized Discontinuous Galerkin Methods for Elliptic Problems(楕円型問題に対するハイブリッド型不連続ガレルキン法の研究)

(JAPANESE)

#### thesis presentations

11:00-12:15 Room #128 (Graduate School of Math. Sci. Bldg.)

Two-dimensional stochastic Navier-Stokes equations derived from a certain variational problem(ある変分問題から導かれる二次元確率ナビエ・ストークス方程式)

(JAPANESE)

**Satoshi YOKOYAMA**(Graduate School of Mathematical Sciences University of Tokyo)Two-dimensional stochastic Navier-Stokes equations derived from a certain variational problem(ある変分問題から導かれる二次元確率ナビエ・ストークス方程式)

(JAPANESE)

#### thesis presentations

13:00-14:15 Room #128 (Graduate School of Math. Sci. Bldg.)

Scattering Theory on Manifolds with Asympotically Polynomially Growing Ends(多項式増大する無限遠境界を持つ多様体上の散乱理論)

(JAPANESE)

**Shinichiro ITOZAKI**(Graduate School of Mathematical Sciences University of Tokyo)Scattering Theory on Manifolds with Asympotically Polynomially Growing Ends(多項式増大する無限遠境界を持つ多様体上の散乱理論)

(JAPANESE)

#### thesis presentations

14:15-15:30 Room #128 (Graduate School of Math. Sci. Bldg.)

On the exact WKB analysis of Schrödinger equations(Schrödinger方程式の完全WKB解析に関して)

(JAPANESE)

**Shingo KAMIMOTO**(Graduate School of Mathematical Sciences University of Tokyo)On the exact WKB analysis of Schrödinger equations(Schrödinger方程式の完全WKB解析に関して)

(JAPANESE)

### 2012/02/02

#### Operator Algebra Seminars

16:30-18:00 Room #002 (Graduate School of Math. Sci. Bldg.)

Weak Exactness for $C^*$-algebras and Application to Condition (AO) (JAPANESE)

**Yusuke Isono**(Univ. Tokyo)Weak Exactness for $C^*$-algebras and Application to Condition (AO) (JAPANESE)

#### thesis presentations

11:00-12:15 Room #118 (Graduate School of Math. Sci. Bldg.)

Studies on the geometry of Mori dream spaces(森夢空間の幾何学に関する研究) (JAPANESE)

**Shinnosuke OKAWA**(Graduate School of Mathematical Sciences University of Tokyo )Studies on the geometry of Mori dream spaces(森夢空間の幾何学に関する研究) (JAPANESE)

#### thesis presentations

13:00-14:15 Room #118 (Graduate School of Math. Sci. Bldg.)

The p-adic monodromy theorem in the imperfect residue field case(剰余体が非完全な場合のp進モノドロミー定理について)

(JAPANESE)

**Shun OKUBO**(Graduate School of Mathematical Sciences University of Tokyo)The p-adic monodromy theorem in the imperfect residue field case(剰余体が非完全な場合のp進モノドロミー定理について)

(JAPANESE)

#### thesis presentations

14:15-15:30 Room #118 (Graduate School of Math. Sci. Bldg.)

On The Discrete Logarithm Problem in Finite Fields(有限体上の離散対数問題について)

(JAPANESE)

**ZHANG Qizhi**(Graduate School of Mathematical Sciences University of Tokyo)On The Discrete Logarithm Problem in Finite Fields(有限体上の離散対数問題について)

(JAPANESE)

#### thesis presentations

15:45-17:00 Room #118 (Graduate School of Math. Sci. Bldg.)

Rationality of the moduli spaces of 2-elementary K3 surfaces(対合付きK3曲面のモジュライの有理性)

(JAPANESE)

**Syohei MA**(Graduate School of Mathematical Sciences University of Tokyo)Rationality of the moduli spaces of 2-elementary K3 surfaces(対合付きK3曲面のモジュライの有理性)

(JAPANESE)

#### thesis presentations

09:45-11:00 Room #128 (Graduate School of Math. Sci. Bldg.)

Determining nodes for semilinear parabolic evolution equations in Banach spaces(バナッハ空間上の半線型放物型発展方程式に対する確定節点)

(JAPANESE)

**Ryohei KAKIZAWA**(Graduate School of Mathematical Sciences University of Tokyo)Determining nodes for semilinear parabolic evolution equations in Banach spaces(バナッハ空間上の半線型放物型発展方程式に対する確定節点)

(JAPANESE)

#### thesis presentations

11:00-12:15 Room #128 (Graduate School of Math. Sci. Bldg.)

Polynomial relations for q-characters via ODM/IM correspondence(ODE/IM対応を用いたq指標の多項式関係)

(JAPANESE)

**SUN JuanJuan**(Graduate School of Mathematical Sciences University of Tokyo)Polynomial relations for q-characters via ODM/IM correspondence(ODE/IM対応を用いたq指標の多項式関係)

(JAPANESE)

#### thesis presentations

13:00-14:15 Room #128 (Graduate School of Math. Sci. Bldg.)

Entire curves in projective algebraic varieties(射影代数多様体内の正則曲線について)

(JAPANESE)

**Yusaku CHIBA**(Graduaate School of Mathematical Sciences University of Tokyo)Entire curves in projective algebraic varieties(射影代数多様体内の正則曲線について)

(JAPANESE)

### 2012/02/01

#### PDE Real Analysis Seminar

10:30-11:30 Room #056 (Graduate School of Math. Sci. Bldg.)

Energetic variational approach: generalized diffusion, stochastic differential equations and optimal transport (ENGLISH)

**Chun Liu**(University of Tokyo / Penn State University)Energetic variational approach: generalized diffusion, stochastic differential equations and optimal transport (ENGLISH)

[ Abstract ]

In the talk, I will explore the general framework of energetic variational approaches, which are the direct consequences of classical isothermal thermodynamics, and their particular applications in generalized diffusion problems. In particular, we reveal the roles of different stochastic integrations (Ito's form, Stratonovich's form and other possible forms) and the Wasserstein metric and the procedure of optimal transport in the context of general framework of theories of linear responses.

In the talk, I will explore the general framework of energetic variational approaches, which are the direct consequences of classical isothermal thermodynamics, and their particular applications in generalized diffusion problems. In particular, we reveal the roles of different stochastic integrations (Ito's form, Stratonovich's form and other possible forms) and the Wasserstein metric and the procedure of optimal transport in the context of general framework of theories of linear responses.

### 2012/01/31

#### Tuesday Seminar of Analysis

16:30-18:00 Room #128 (Graduate School of Math. Sci. Bldg.)

Obstacle problems in unbounded domains (ENGLISH)

**Michel Chipot**(University of Zurich)Obstacle problems in unbounded domains (ENGLISH)

[ Abstract ]

We will present a formulation of obstacle problems in unbounded

domains when the energy method does not work, i.e. whenthe force does not belong to H^{-1}.

We will present a formulation of obstacle problems in unbounded

domains when the energy method does not work, i.e. whenthe force does not belong to H^{-1}.

### 2012/01/30

#### Algebraic Geometry Seminar

15:30-17:00 Room #122 (Graduate School of Math. Sci. Bldg.)

On varieties of globally F-regular type (JAPANESE)

**Yoshinori Gongyo**(University of Tokyo)On varieties of globally F-regular type (JAPANESE)

[ Abstract ]

I will talk about recent topics on varieties of globally F-regular type.

I will talk about recent topics on varieties of globally F-regular type.

#### Seminar on Geometric Complex Analysis

10:30-12:00 Room #128 (Graduate School of Math. Sci. Bldg.)

Differential equations as embedding obstructions and vanishing theorems (ENGLISH)

**Damian Brotbek**(University of Tokyo)Differential equations as embedding obstructions and vanishing theorems (ENGLISH)

[ Abstract ]

Given a smooth projective variety $X$ it is natural to wonder what is the smallest integer $N$ such that one can embed $X$ into $\mathbf{P}^N$. In this talk I will first recall what can be said for any smooth projective variety, then I will explain how the existence of some particular differential equations on $X$ yields obstructions to the existence of some projective embeddings.

Given a smooth projective variety $X$ it is natural to wonder what is the smallest integer $N$ such that one can embed $X$ into $\mathbf{P}^N$. In this talk I will first recall what can be said for any smooth projective variety, then I will explain how the existence of some particular differential equations on $X$ yields obstructions to the existence of some projective embeddings.

### 2012/01/27

#### Colloquium

16:30-17:30 Room #123 (Graduate School of Math. Sci. Bldg.)

On Topological Blow-up (JAPANESE)

**Taro YOSHINO**(Graduate School of Mathematical Sciences, University of Tokyo)On Topological Blow-up (JAPANESE)

[ Abstract ]

Topological blow-up is a method to understand non-Hausdorff spaces. We define an obstruction to Hausdorffness, and call it crack. By `blowing up' the points in crack, we can obtain better space.

Topological blow-up is a method to understand non-Hausdorff spaces. We define an obstruction to Hausdorffness, and call it crack. By `blowing up' the points in crack, we can obtain better space.

### 2012/01/26

#### Operator Algebra Seminars

16:30-18:00 Room #117 (Graduate School of Math. Sci. Bldg.)

The transverse fundamental class of linear foliations

on torus bundles over the circle (ENGLISH)

**Catherine Oikonomides**(Univ. Tokyo)The transverse fundamental class of linear foliations

on torus bundles over the circle (ENGLISH)

### 2012/01/24

#### Numerical Analysis Seminar

16:30-18:00 Room #002 (Graduate School of Math. Sci. Bldg.)

Phasefield model for crack simulation and its application (JAPANESE)

[ Reference URL ]

http://www.infsup.jp/utnas/

**Takeshi Takaishi**(Hiroshima Kokusai Gakuin University)Phasefield model for crack simulation and its application (JAPANESE)

[ Reference URL ]

http://www.infsup.jp/utnas/

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