# Seminar

## On A_2-liftings of sum formulas and Bowman-Bradley type formulas for finite multiple zeta values

November 22 at 11:40 - 12:40, 2018

Dr. Shin-ichiro Seki (Tohoku University)

Both the sum formula and Bowman-Bradley's theorem for multiple zeta values are well known. Recently, Saito and Wakabayashi proved counterparts of these two formulas for A-finite multiple zeta values. ...more

Venue: Seminar Room #160

Event Official Language: English

## Generating functions of CM & RM values

November 22 at 10:30 - 11:30, 2018

Dr. Toshiki Matsusaka (Kyushu University)

The special values of the elliptic modular j function j(z) at imaginary quadratic points are known as singular moduli (CM values), and play important roles in algebraic number theory. As a real quadra...more

Venue: Seminar Room #160

Event Official Language: English

## ABBL-iTHEMS Joint seminar 2

November 16 at 14:00 - 16:00, 2018

Dr. Tada-aki Isobe (RIKEN Nishina Center)

Title: Study of density dependent nuclear symmetry energy by using heavy RI collisions at RIKEN-RIBF Abstract: The nuclear Equation of State (EoS) is a fundamental property of nuclear matter. An inte...more

Venue: Seminar Room #160

Event Official Language: English

## Spintronics in Non-Inertial Frames

November 15 at 13:00 - 18:00, 2018

Prof. Mamoru Matsuo (University of Chinese Academy of Sciences, China)

非慣性系におけるスピン流生成の微視的計算の概略を把握していただくことを目標に，以下3項目を扱う． (1) スピン接続と回転系のDirac方程式 非慣性系の一種である回転系のスピンダイナミクスを調べるために，一般共変Dirac方程式の低エネルギー展開から，スピン・回転結合とよばれる相互作用が誘起されることを示す． (2) 非平衡グリーン関数法と非磁性金属/磁性体界面のスピン輸送 非慣性系のスピ...more

Venue: Seminar Room #160

Event Official Language: Japanese

## ABBL-iTHEMS Joint Seminar

November 12 at 14:00 - 15:00, 2018

Dr. Volodymyr Takhistov

Title: New Venues in Formation and Detection of Primordial Black Hole Dark Matter Abstract: Primordial black holes (PBH) provide an attractive non-particle dark matter (DM) candidate. I will discus...more

Venue: Seminar Room #160

Event Official Language: English

## The 28th QCD Club

November 9 at 15:00 - 17:00, 2018

Prof. Kazuyuki Kanaya (Professor, Institute of Pure and Applied Sciences, University of Tsukuba)

Title: Application of a gradient flow method to thermodynamics of QCD with dynamical quarks Language: Japanese or English

Venue: #433, Main Research Building

Event Official Language: English

## Population genetics of duplicated genes

November 1 at 15:30 - 18:00, 2018

Prof. Hideki Innan (SOKENDAI)

Venue: Seminar Room #160

Event Official Language: English

## Assembly rules and a theory for invasion and extinction in minimal food webs

October 29 at 15:00 - 18:00, 2018

Prof. Namiko Mitarai (Niels Bohr Institute, Denmark)

We propose a theory of the evolution of a minimal food web by sequential invasion of new species [1]. Our theory is based on the standard generalized Lotka-Volterra equations, where basal species comp...more

Venue: Seminar Room #160

Event Official Language: English

## Relations between fractal dimensions and arithmetic progressions

October 23 at 11:35 - 12:35, 2018

Mr. Kota Saito (Nagoya University)

In this talk we give estimates for the dimensions of sets in real numbers which uniformly avoid finite arithmetic progressions. More precisely, we say that $F$ uniformly avoids arithmetic progressions...more

Venue: Large Meeting Room, 2F Welfare and Conference Building (Cafeteria)

Event Official Language: English

## Generalized Erdös and Obláth theorem for polynomial-factorial Diophantine equations

October 23 at 10:30 - 11:30, 2018

Mr. Wataru Takeda (Nagoya University)

Diophantine equations are equations where only integer solutions are accepted. There are many types of Diophantine equations and many results are known. Our Diophantine equation is of the form x^n+y^n...more

Venue: Large Meeting Room, 2F Welfare and Conference Building (Cafeteria)

Event Official Language: English

## Non-Hermitian phase transition from a polariton Bose-Einstein condensate to a photon laser

September 28 at 13:30 - 17:00, 2018

Dr. Ryo Hanai (Osaka University)

Venue: Seminar Room #160

Event Official Language: Japanese

## Number Theory Seminar

July 24 at 10:00 - 12:35, 2018

Dr. Masataka Ono
(Keio University)

Dr. Shingo Sugiyama
(Nihon University)

Mr. Yoshinosuke Hirakawa
(Keio University)

This seminar is aimed at scientists in general, not only to mathematicians. 10:00-10:45 "Multiple zeta functions associated with 2-colored rooted trees" Masataka Ono 10:55-11:40 "Modular forms and...more

Venue: Seminar Room #160

Event Official Language: English

## Introduction to topological band structure

July 6 at 10:30 - 17:30, 2018

Dr. Tomoki Ozawa (Senior Research Scientist, iTHEMS)

Venue: Seminar Room #160

Event Official Language: Japanese

## Topological Photonics and the four-dimensional quantum Hall effect

July 3 at 15:00 - 17:00, 2018

Dr. Tomoki Ozawa (Senior Research Scientist, iTHEMS)

Venue: 1F Meeting Room, AIMR Main Building

Event Official Language: English

## Denso IT Lab. and RIKEN Joint Innovation Seminar

June 29 at 16:00 - 17:40, 2018

16:00-17:00 Denso IT Laboratory "About Denso IT lab." H. Iwasaki (Denso) "Human-Car interface" H. Tsukahara (Denso) "Math in machine leaning and computer vision" K. Ishikawa (Denso) 17:00-17:...more

Venue: Common Room #246-248

Event Official Language: Japanese

## Introduction to spin-boson model

June 22 at 10:30 - 17:30, 2018

Dr. Takeo Kato (The Institute for Solid State Physics (ISSP), The University of Tokyo)

10:30-12:30 Introduction to spin-boson model @DR3 (14th Building 213) 14:00-15:30 Kondo effect @DR7 (14th Building 217) 16:00-17:30 Detail of NIBA formalism @DR7 (14th Building 217)

Venue: Yagami Campus, Keio University

Event Official Language: Japanese

## Relative and equivariant Lagrangian Floer homology and Atiyah-Floer conjecture

June 19 at 14:30 - 16:00, 2018

Prof. Kenji Fukaya (Senior Visiting Scientist, iTHEMS)

Supported by RIKEN iTHEMS and Tuesday Seminar on Topology (Graduate School of Mathematical Sciences, The University of Tokyo).

Venue: Room 056, Graduate School of Mathematical Sciences, The University of Tokyo

Event Official Language: Japanese

## 1-form Lieb-Schultz-Mattis theorem and anomaly matching in quantum dimer model

June 8 at 13:30 - 17:00, 2018

Dr. Yuta Kikuchi (RBRC Researcher, Theory Group, RIKEN BNL Research Center)

Venue: SUURI-COOL (Kyoto)

Event Official Language: Japanese

## Abelian-Higgs dualities in quantum defect-mediated melting phase transitions

April 27 at 14:30 - 17:30, 2018

Dr. Aron Beekman (Keio University)

Venue: Seminar Room #160

Event Official Language: English

## Thermodynamic of a one-dimensional Bose gas at low temperature & superfluidity in neutron-star matter

April 24 at 15:30 - 16:30, 2018

Dr. Giulia De Rosi (The Institute of Photonic Sciences, Barcelona, Spain)

Venue: Seminar Room #160

Event Official Language: English