# Press Release

## Research Collaboration Agreement Signed to Expand the Field of Multi-Messenger - RIKEN CPR, iTHEMS and ICRR The University of Tokyo

2020-10-27

By October 22, RIKEN Cluster for Pioneering Research, iTHEMS and Institute for Cosmic Ray Research concluded a research collaboration agreement to further promote research cooperation in the field of multi-messenger cosmic ray physics, including joint research and personnel exchanges.

# Press Release

## Established RIKEN SUURI CORPORATION with investment from RIKEN, RIKEN Innovation Co., Ltd., and JSOL

2020-10-27

-Building a New Innovation Platform through Collaboration between Academia and Business-

RIKEN, RIKEN Innovation Co., Ltd. and JSOL Corporation have jointly established RIKEN SUURI CORPORATION, effective October 1, 2020. This is RIKEN's first investment in a venture. RIKEN, Japan's only research institute for the natural sciences, has a wealth of research and development capabilities that have been cultivated over its more than 100-year history, the first product to be brought to the market by RIKEN's investment was neither state-of-the-art equipment nor a drug, but "the best brains in the mathematical sciences itself". RIKEN SUURI CORPORATION aims to be a company that maximizes the use of mathematical sciences to solve the fundamental problems of society.

# Seminar Report

## iTHEMS Theoretical Physics Seminar by Dr. Tokuro Fukui on October 22, 2020

2020-10-23

On October 22, the iTHEMS-phys seminar entitled "Realistic shell model and chiral three-body force” given by Dr. Tokuro Fukui (YITP, Kyoto U.) was held.

He and his collaborators proposed the way to calculate matrix elements of the three-body nuclear force, and showed the importance and effects of the three-body nuclear force in medium-heavy nuclei, such as calcium and nickel isotopes, starting from the chiral nuclear force using the shell model calculation. During his seminar, he introduced their works from the introduction to state-of-art results.

The seminar was held via the Zoom online conference systems, and more than 25 people including outside of iTHEMS attended the seminar.

Realistic shell model and chiral three-body force

October 22 at 13:30 - 15:00, 2020

# Upcoming Events

## External Event

### The Mathematical Society of Japan: Cross-discipline and cross-industry research exchange meeting 2020

October 31 at 10:00 - 17:00, 2020

「数学・数理科学専攻若手研究者のための異分野・異業種研究交流会（研究交流会）」は、 数学・数理科学専攻の博士課程学生をはじめとする若手研究者と産業界を含む異分野の方々 との「双方向の交流の場」として2014年から開催しております。若手研究者の皆様に、諸科学や産業への応用展開のような数学の思わぬ力を発見してもらう ことや、産業界を含む様々な分野で活躍できる場の存在を認識してもらうことが主たる目的 です。高等学校、大学を含む教育・研究機関の教職員や企業関係者の皆様にも、産業界における数学 ・数理科学やその知識を有する人材のニーズを把握してもらうことも目的の一つです。

Venue: via Online

Event Official Language: Japanese

## Seminar

### Mathematical aspects of quasi-Monte Carlo integration

November 5 at 16:00 - 18:10, 2020

Dr. Kosuke Suzuki (Assistant Professor, Graduate School of Advanced Science and Engineering, Hiroshima University)

In this talk, I will introduce mathematical aspects of quasi-Monte Carlo (QMC) integration. We aim to approximate the integral of a function on the d-dimensional hypercube [0,1]^d. A useful approach is Monte-Carlo (MC) integration, which uses randomly chosen samples. A drawback of MC is the rate of convergence; the standard deviation of the estimator converges as 1/sqrt(n) asymptotically in n. To have a better rate of convergence as O(log^d N/N) or more, QMC uses deterministic, uniformly distributed points.

In the first part, I will give an overview of QMC, such as star-discrepancy, Koksma-Hlawka inequality, and some explicit constructions as lattices and digital nets.

In the second part, I will show that QMC using lattices and digital nets can achieve a higher rate of convergence for smooth integrands.

Venue: via Zoom

Event Official Language: English

## Colloquium

### The Unreasonable Effectiveness of Quantum Theory in Mathematics

November 26 at 10:00 - 11:30, 2020

Prof. Robbert Dijkgraaf (Director, Institute for Advanced Study in Princeton, USA)

November 26 at 10:00-11:30, 2020 (JST)

November 25 at 20:00-21:30, 2020 (EST)

The physical concepts of quantum theory, in particular of quantum gravity and string theory, have proven to be extremely powerful in addressing deep problems in pure mathematics, from knot invariants to algebraic geometry. Is there such a thing as “quantum mathematics”? Should we add Feynman diagrams, strings, branes and black holes to the language of mathematics?

Venue: via Zoom

Event Official Language: English

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