iTHEMS Weekly News Letter


Dr. Jeffery Fawcett received 12th annual RIKEN Research Incentive Award (Ohbu Award)


Jeffery Fawcett received "FY2020 Researcher Incentive Award (桜舞賞)" on March 17, 2021 for his achievements in the "Study of genome evolution using large-scale genomic data". Congratulations!

Press Release

The future may come when each of us can carry around a black hole as information storage device


-- Imagining and prototyping future information storage devices based on scientific theories.--

The first prototype of the Useless Prototyping Studio, "Black Hole Recorder," has been completed and is now on display at the National Museum of Emerging Science and Innovation from March 14 (Sun.) to 21 (Sun.), 2021.

The "Useless Prototyping Studio", which uses seemingly useless prototypes to visualize the possibility that curiosity about the unknown can create the future, has created its first prototype, the "Black Hole Recorder," a future information storage device. The outline and background information are available on a special website released today, March 12. In addition, as an opportunity for the general public to view the recorder, it will be exhibited at the National Museum of Emerging Science and Innovation (Miraikan) in Koto-ku, Tokyo, from March 14 (Sunday), the birthday of Albert Einstein and the death anniversary of Stephen Hawking, the two scientists who developed the basic theory of black holes.

The Black Hole Recorder is a prototype black hole storage device developed with an eye to the future where black holes can be controlled and used as a device to store information. Based on the motif of a phonograph, it implements a device that can record huge amounts of data. In addition to storing large amounts of information, it is also capable of retrieving the information it has captured. Since the invention of writing thousands of years ago, humans have evolved the media and technologies for recording information from paper, printing, photography, phonograph, video, and data. In recent years, developments have been made to see how large a quantity of information can be stored. And in the future, we can think of the possibility of a time when black holes can be used as information storage and carried around in our pockets.

Seminar Report

Quantum Matter Seminar by Prof. Takahiro Morimoto on March 16, 2021


On March 16th, Prof. Takahiro Morimoto from the University of Tokyo gave an online talk on geometric nonlinear optical effects. First, he introduced topological states of matter and the notion of the Berry connection to the audience. He explained how these concepts lead to the quantization of observable quantities in the linear-response regime so that the audience learned the background to understand his main research works. After the introduction, he talked about several geometric nonlinear effects in topological states beyond the linear response theory. In particular, the shift current stems from the geometric nonlinear response, and the quantized circular photogalvanic effect can be realized in specific Weyl semimetals. In addition to the theoretical concepts, he also discussed experimental observations, such as perovskite-based solar cell materials and chiral multifold fermion compound RhSi. During and after the talk there were interactive discussions, and more than 25 participants attended this well-presented talk.

Reported by Chen-Hsuan Hsu (CEMS, RIKEN) and Ching-Kai Chiu

Upcoming Events


iTHEMS Math Seminar

The Green-Tao theorem for number fields

March 22 at 16:00 - 18:10, 2021

Dr. Wataru Kai (Assistant professor, Mathematical Institute, Tohoku University)

5, 11, 17, 23, 29 are prime numbers which form an arithmetic progression of length 5. A famous theorem of Ben Green and Terence Tao in 2008 says there are arbitrarily long arithmetic progressions of prime numbers. Algebraic number theorists are also interested in more general numbers like square roots of integers. Recently, Mimura, Munemasa, Seki, Yoshino and I have established a generalization of the Green-Tao theorem in such a direction.

In the first 50 minutes of my talk, I would like to explain some background and technology behind the Green-Tao theorem. In the second half after a break, I explain the concept of number fields to formulate our generalization of their result. I will also discuss how one of the new difficulties, which I call the norm vs length conflict, is handled by a technique called Geometry of Numbers.

*Please contact Keita Mikami or Hiroyasu Miyazaki's mailing address to get access to the Zoom meeting room.

Venue: via Zoom

Event Official Language: English


Dr. Akinori Tanaka thumbnail

Information Theory SG Seminar

Journal Club: Reinforcement Learning

March 24 at 13:00 - 14:00, 2021

Dr. Akinori Tanaka (Senior Research Scientist, iTHEMS)

Reinforcement Learning (RL) is a scheme of Machine Learning that is applicable "without training data." Instead, we prepare a "world" that agents (learners) can probe, and try to optimize their behavior. Historically, study of RL has deep connection to studies of psychology and neuroscience. In this journal club, I would like to give a lightning review of RL.

*Detailed information about the seminar refer to the email.

Venue: via Zoom

Event Official Language: English


Prof. Yoh Iwasa thumbnail

Symposium in Commemoration of Professor Iwasa's Retirement

March 26 at 16:30 - 17:30, 2021

Prof. Yoh Iwasa (Senior Advisor, iTHEMS / Professor, Kwansei Gakuin University)

16:30 - 17:30
"Biology and Mathematical Modeling --- A Report on Fun Days at Kobe Mita Campus
Prof. Yoh Iwasa (School of Science and Technology, Kwansei Gakuin University)

Venue: via Online

Event Official Language: Japanese


Math-Phys Joint Seminar

Self-adjoint extension in quantum mechanics and non-Rydberg spectra of one-dimensional hydrogen atom

April 13 at 16:00 - 18:10, 2021

Prof. Takuju Zen (Professor, School of Environmental Science and Engineering, Kochi University of Technology)

We offer a beginner’s guide to the functional-analytical techniques in quantum mechanics, and cover its application to the 1D Coulomb problem. It is shown that the wave function at the diverging point of the Coulomb potential is mathematically described by three-parameter family of generalized connection conditions. A scheme is devised to physically implement the generalized conditions, which provides the way to experimentally realize non-Rydberg spectra in 1D Hydrogen atom.

Part 1, Self-adjoint extension of Hilbert space operator
Part 2, 1D Coulomb problem

Venue: via Zoom

Event Official Language: English


The 15th MACS Colloquium thumbnail

MACS ColloquiumSupported by iTHEMSSUURI-COOL (Kyoto)

The 15th MACS Colloquium

April 23 at 15:00 - 17:30, 2021

Prof. Hiroshi Ishikawa (Professor, Faculty of Science and Engineering, Waseda University)

15:00- Talk by Prof. Hiroshi Ishikawa
16:05- MACS Student Conference FY2021

Venue: via Zoom

Event Official Language: Japanese

Upcoming Visitor

Dr. Nagisa Hiroshima thumbnail

March 21 - 23, 2021

Dr. Nagisa Hiroshima

Visiting Scientist, iTHEMS / Assistant Professor, Department of Physics, Faculty of Science, University of Toyama

Research fields: Dark Matter, High Energy Astrophysics

Visiting Place: RIKEN Wako Campus

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