# Announcement

## Mathematics activities in iTHEMS were featured in RIKEN Pamphlet 2018

2018-07-02

Mathematics activities in iTHEMS were featured in RIKEN Pamphlet 2018 (in Japanese). Take a look at the photo of our colleagues, Takashi Tsuboi, Yuka Kotorii and Yosuke Kubota (from the left), trying to make a breakthrough with modern mathematics in page 19 of RIKEN Pamphlet.

# Hot Topic

## Joint innovation seminar between RIKEN iTHEMS and Denso IT lab. was held on June 28

2018-07-02

On June 28, joint innovation seminar between RIKEN iTHEMS and Denso IT lab. was held. After the general introduction to the Denso IT lab. There were two talks from Denso IT lab. (Human-car interface; Machine leaning and computer vision) and two talks from RIKEN iTHEMS (Topology in classical systems; Hadrons in quantum chromodynamics). It turned out that the background of all 4 speakers are theoretical physics. The iTHEMS coffee room was filled with people from both labs. and lively discussions among participants continued until 8pm. This meeting would be a model case where "real" interactions between researchers in academia and industry are made possible.

Denso IT Lab. and RIKEN Joint Innovation Seminar

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

# Hot Topic

## Prof. Satoshi Aoki's one day lecture was held on June 26

2018-06-29

On June 26, Professor Satoshi Aoki (Kobe Univ.) gave a series of lectures about "computational algebraic statistics and its applications". His lecture is about application of the Grobner basis to statistic theory. Lecture 1 was an introduction to ideal of polynomial rings and its relation to the Grobner basis. In Lecture 2, he explained Grobner basis in design of experiments. In Lecture 3, he explained Grobner basis in statistical hypothesis with contingency tables. There were more than 30 participants from inside and outside of RIKEN. Background of the participants are mathematics, statistics, physics, biology, information science and medical science. There were many questions from the participants on the mathematical and practical aspects of the Grobner basis, and the lively discussions continued at the time of lunch and coffee break. This lecture turns out to be a model case of having both mathematicians and practitioners together to discuss the power of mathematics and it applications.

Computational Algebraic Statistics and its Applications

June 26 at 10:00 - 16:30, 2018

# Upcoming Events

## Seminar

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

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

Dr. Tomoki Ozawa (Senior Research Scientist, iTHEMS)

Event Official Language: English

## Colloquium

### The 5th MACS colloquium

July 3 at 15:00 - 17:30, 2018

Dr. Keisuke Fujii (Kyoto University)

Prof. Takao Hirajima (Kyoto University)

15:00 ティータイム

15:15「量子コンピュータ：情報と物理、基礎と応用、理学と工学の交差点」藤井 啓祐氏（京都大学大学院理学研究科 物理学・宇宙物理学専攻 特定准教授）

16:30「沈み込み帯で活動する水の挙動の理解へ：青色片岩は有馬型熱水の起源」平島 崇男氏（京都大学大学院理学研究科 地球惑星科学専攻 教授）

The 5th MACS colloquium supported by iTHEMS. It will be broadcasted to Wako by Skype, but if you can join the colloquium physically in Kyoto, that would be better. iTHEMS provides good cakes/cookies at Kyoto!

Venue: Lecture room #401, Graduate School of Science Building No 6, Kyoto University

Broadcast: Seminar Room #160, 1F Main Research Building, RIKEN

Event Official Language: Japanese

## Workshop

### iCeMS-iTHEMS Joint Workshop on Interdisciplinary Biology

July 4 at 10:00 - 16:30, 2018

This is the first joint workshop between iCeMS (Kyoto Univ.) and iTHEMS (RIKEN). The WS is co-hosted by KUIAS (Kyoto Univ.), iTHEMS (RIKEN) and MACS Program (Kyoto Univ.). By exploring the forefront of experimental and mathematical biology, this workshop aims to stimulate novel research directions in these areas and strengthen the connection between Kyoto Univ. and RIKEN. Those who plan to attend the "get-together", please register before June 22 (Fri.) noon.

Co-hosted by

Kyoto University Institute for Advanced Study (KUIAS), Kyoto Univ.

Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS), RIKEN

MACS Program (MACS), Kyoto Univ.

Venue: #201, Maskawa Building for Education and Research, North Campus, Kyoto University

Event Official Language: English

## Seminar

### Introduction to topological band structure

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

Dr. Tomoki Ozawa (Senior Research Scientist, iTHEMS)

Venue: Seminar Room #160, 1F Main Research Building, RIKEN

Event Official Language: Japanese

## Math Lecture

### Introduction to Public-Key Cryptography (6th)

July 11 at 10:30 - 12:00, 2018

Dr. Eren Mehmet Kıral (Visiting researcher, RIKEN Center for Advanced Intelligence Project)

Venue: Seminar Room #160, 1F Main Research Building, RIKEN

Event Official Language: English

## Math Lecture

### Theory of Operator Algebras (3rd)

July 12 at 15:30 - 17:00, 2018

Dr. Yosuke Kubota (Research Scientist, iTHEMS)

Venue: Seminar Room #160, 1F Main Research Building, RIKEN

Event Official Language: English

## Workshop

### The 9th RIKEN-Kyoto University Joint Data Assimilation Workshop

July 17 at 13:30 - 17:30, 2018

If you plan to attend the workshop, please register by July 13.

Hosted by Data Assimilation Research Team, RIKEN and Graduate School of Science, Kyoto University

Co-hosted by iTHEMS, RIKEN

Venue: #809 Graduate School of Science Bldg. No 6, Kyoto University

Event Official Language: Japanese

## Colloquium

### Bell's Theorem, Entanglement, Quantum Teleportation and All That

July 19 at 16:00 - 17:30, 2018

Prof. Anthony James Leggett (Professor, University of Illinois at Urbana-Champaign, USA)

iTHEMS-CEMS Joint Colloquium.

Professor Leggett is widely recognized as a world leader in the theory of low-temperature physics, and his pioneering work on superfluidity was recognized by the 2003 Nobel Prize in Physics.

Venue: Okochi Hall, 1F Laser Science Laboratory, RIKEN

Broadcast: #311, Computational Science Research Building, R-CCS, Kobe Campus, RIKEN / SUURI-COOL (Kyoto), #204-205, 2F Maskawa Building for Education and Research, North Campus, Kyoto University / 2F Seminar Room, AIMR Main Building, Advanced Institute for Materials Research (AIMR), Tohoku University

Event Official Language: English

## Seminar

### 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 trace formulas with applications to equidistributions of their Fourier coefficients" Shingo Sugiyama

11:50-12:35 "On a generalization of Dobinski's formula" Yoshinosuke Hirakawa

Venue: Seminar Room #160, 1F Main Research Building, RIKEN

Event Official Language: English

## Symposium

### International Symposium on Quantum Fluids and Solids (QFS)

July 25 - 31, 2018

The International Symposium on Quantum Fluids and Solids (QFS) will be held at Ito International Research Center (IIRC) on Hongo campus of the University of Tokyo, Japan, from July 25 through 31, 2018. One of the sponsors of this conference is iTHEMS.

The QFS series started forty-three years ago making it one of the oldest series of international conferences in the field of low temperature physics. It has historically been focusing on physics of liquid and solid helium and hydrogen. But in this century its scope is expanding widely from laser cooled cold atoms to topological matters. At QFS2018 in Tokyo, this trend will be continued and with even more interdisciplinary aspects emphasized between the traditional subjects and those in broader physical systems.

Venue: Ito International Research Center (IIRC), Hongo Campus, The University of Tokyo

Event Official Language: English

# Person of the Week

## Self-introduction: Jason Chang

2018-07-02

I am Jason Chang, a research scientist at iTHEMS. I received my bachelors and PhD in physics from the University of Illinois at Urbana-Champaign. During my PhD, my focus was on calculating the hadronic contributions to flavor physics using lattice quantum chromodynamics (LQCD). Afterwards, I joined the LQCD group at Lawrence Berkeley National Laboratory (LBNL) to understand the contributions of the strong interaction in nuclear matter. My interests have since then also extended to explore the possibility of applying quantum annealing to machine learning techniques, and as led to new collaborations with scientists from condensed matter and quantum information science. I am very happy to join iTHEMS, and as a member who is primarily located at LBNL, I look forward to hosting and working with anyone interested in visiting the Bay Area for both the collaboration opportunities with scientists here, as well as industry experts around this area.

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