Volume 12

iTHEMS Weekly News Letter

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.

Seminar Report

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.

Seminar Report

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.

Upcoming Events

Seminar

Tomoki Ozawa thumbnail
AIMR Main Building venue photo

SUURI-COOL SeminarSUURI-COOL (Sendai)

Topological Photonics and the four-dimensional quantum Hall effect

July 3 (Tue) at 15:00 - 17:00, 2018

Tomoki Ozawa (Senior Research Scientist, iTHEMS)

In this seminar, I will give an introduction to topological photonics, that is, the study of topological band structures and resulting topological phenomena in photonic systems. I will first review basic concepts of topological band structures, and then explain what it means to realize topological band structures in photonic systems. I will particularly emphasize some important differences with respect to solid-state electron systems. I then present some of my own works in topological photonics, such as the synthetic dimensions in photonic systems, which allows one to explore models and phenomena in high dimensions including the four-dimensional quantum Hall effect.

Venue: 1F Meeting Room, AIMR Main Building, Advanced Institute for Materials Research (AIMR), Tohoku University

Event Official Language: English

Colloquium

The 5th MACS Colloquium thumbnail

MACS ColloquiumSupported by iTHEMSSUURI-COOL (Kyoto)

The 5th MACS Colloquium

July 3 (Tue) at 15:00 - 17:30, 2018

Keisuke Fujii (Program-Specific Associate Professor, Graduate School of Science, Kyoto University)
Takao Hirajima (Kyoto University)

15:00- Teatime
15:15- Talk by Dr. Keisuke Fujii (Kyoto University)
16:30- Talk by Prof. Takao Hirajima (Kyoto University)

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

Maskawa Building for Education and Research venue photo

Co-hosted by iTHEMSSUURI-COOL (Kyoto)

iCeMS-iTHEMS Joint Workshop on Interdisciplinary Biology

July 4 (Wed) 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

Tomoki Ozawa thumbnail

STAMP Seminar

Introduction to topological band structure

July 6 (Fri) at 10:30 - 17:30, 2018

Tomoki Ozawa (Senior Research Scientist, iTHEMS)

In this seminar, I give an introduction to topological band structures. Topological band structure is the fundamental idea to understand phenomena such as the quantum Hall effect, topological insulators, and topological superconductors. Although originally found in fermionic electron systems, topological band structure is essentially a single-particle property, and thus the same phenomenon can arise also in bosonic systems. In fact, topological band structure does not even need quantum mechanics; topological band structure can arise in classical waves inside a periodic medium, such as electromagnetic waves or classical mechanical waves. In this seminar, I first give a brief introduction to key concepts in topological band structures, such as Berry curvature, Chern number, bulk-edge correspondence, and ten-fold way classification of topological insulators. I then explain how topological band structure can arise in classical systems, giving a brief introduction to the field of topological photonics and topological mechanics.

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

Event Official Language: Japanese

Math Lecture

Introduction to Public-Key Cryptography

Introduction to Public-Key Cryptography (6th)

July 11 (Wed) at 10:30 - 12:00, 2018

Eren Mehmet Kıral (Visiting Researcher, RIKEN Center for Advanced Intelligence Project (AIP))

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

Event Official Language: English

Math Lecture

Yosuke Kubota thumbnail

Theory of Operator Algebras

Theory of Operator Algebras (3rd)

July 12 (Thu) at 15:30 - 17:00, 2018

Yosuke Kubota (Research Scientist, iTHEMS)

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

Event Official Language: English

Workshop

Co-hosted by iTHEMSSUURI-COOL (Kyoto)

The 9th RIKEN-Kyoto University Joint Data Assimilation Workshop

July 17 (Tue) 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

iTHEMS Colloquium

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

July 19 (Thu) at 16:00 - 17:30, 2018

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.

Abstract:
One of the most surprising aspects of quantum mechanics is that under certain circumstances it does not allow individual physical systems, even when isolated, to possess properties in their own right. This feature, first clearly appreciated by John Bell in 1964, has over the last half-century been tested experimentally and found (in most people's opinion) to be spectacularly confirmed. More recently it has been realized that it permits various operations which are classically impossible, such as "teleportation" and secure-in-principle cryptography.
This talk is a very basic introduction to the subject, which requires only elementary quantum mechanics.

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

Number Theory Seminar: 3 Talks

July 24 (Tue) at 10:00 - 12:35, 2018

Masataka Ono (Keio University)
Shingo Sugiyama (Nihon University)
Yoshinosuke Hirakawa (Keio University)

This seminar is aimed at scientists in general, not only to mathematicians.

10:00-10:45
Title: Multiple zeta functions associated with 2-colored rooted trees
Speaker: Dr. Masataka Ono (Keio University)
Abstract: In our recent work, we introduced a combinatorial object and finite sum associated with them which we call finite multiple zeta values associated with 2-colored rooted trees and gave a unified interpretation to some types of finite multiple zeta values. In this talk, we introduce multiple zeta function associated with 2-colored rooted tree and discuss its analytic properties, for example, the possible singularities and functional equations.

10:55-11:40
Title: Modular forms and trace formulas with applications to equidistributions of their Fourier coefficients
Speaker: Dr. Shingo Sugiyama (Nihon University)
Abstract: Modular forms are interesting objects in number theory as they are related to arithmetic problems. Trace formulas of Hecke operators acting on modular forms are very useful tools to study arithmetic invariants: Fourier coefficients, special values of L-functions, Hurwitz class numbers. We will start fundamental notions on modular forms and trace formulas of Hecke operators for non-experts, and introduce our results on a generalization of Serre’s vertical Sato-Tate law. Some results in this talk are based on a joint work with Masao Tsuzuki (Sophia University).

11:50-12:35
Title: On a generalization of Dobinski's formula
Speaker: Yoshinosuke Hirakawa (Keio University)
Abstract: Dobinski's formula is a very classical formula, which expresses the Bell number as an infinite series. Here, the Bell number is the number of partitions of a finite set. Such a "combinatorial-analytic" formula should lead us to more beautiful number theory. In this talk, we introduce a generalization of Dobinski's formula by means of a certain multiple generalization of the exponential function.

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

Event Official Language: English

Conference

Supported by iTHEMS

International Symposium on Quantum Fluids and Solids (QFS)

July 25 (Wed) - 31 (Tue), 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

Jason Chang thumbnail

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.

If you would like to cancel your subscription or change your email address,
please let us know via our contact form.