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iTHEMS Weekly News Letter

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RIBF “Hodan-kai” meeting on the future of exotic nuclear physics


The second in the series of the RIBF “Hodan-kai” meeting by the young researchers was held at Kobe campus of RIKEN, Integrated Innovation Building, from Feb.18 to 20, 2019. This meeting is aimed at an intensive discussion based on a pure curiosity such as what is interesting and what we want to do in the future in a frank and low-pressure atmosphere. In this meeting, there were 42 participants. We had stimulating talks (14 for invited and 11 for contributed) and discussions not only on the future of nuclear physics with RIBF but also on its related fields: Deep learning, Quantum computing, Computational physics, Weak measurement, Super-heavy elements, Hadron physics, and Laser physics. Following the success of this time, we are planning to hold the next meeting in February 2020, and welcome many young researchers to join.

Upcoming Events


The 2nd International Workshop on Quantum Many-Body Problems in Particle, Nuclear, and Atomic Physics

March 7 - 11, 2019

Following the 1st International Workshop on Quantum Many-Body Problems in Particle, Nuclear, and Atomic Physics, which was successfully held at Duy Tan University (DTU) in Danang city, Vietnam in March, 2017, this second workshop, which is hosted and co-hosted by DTU and RIKEN iTHEMS, will take place at University of Khanh Hoa (UKH), Nha Trang city, Vietnam from Mar. 7 (Thur.) to Mar. 11 (Mon.), 2019. The following topics will be discussed:
+ Hadron Physics
+ Nuclear physics
+ Astrophysics
+ Atomic Physics

Special Speaker: Prof. Akito Arima (Chancellor of Musashi Academy of the Nezu Foundation)

Invited Speakers:
+ Prof. Luciano Moretto (University of California Berkeley and Lawrence Berkeley National Laboratory, USA)
+ Prof. Alexander Voinov (Department of Physics and Astronomy, Ohio University, USA)
+ Dr. A. K. Rhine Kumar (Department of Physics, Cochin University of Science and Technology, India)
+ Dr. Deepak Pandit (Variable Energy Cyclotron Centre, India)
+ Dr. Balaram Dey (Saha Institute of Nuclear Physics, India)

Venue: University of Khanh Hoa, Nha Trang City, Vietnam

Event Official Language: English


iTHEMS Colloquium

ZetaValue2019-iTHEMS Special Mathematics Colloquium

March 21 at 14:00 - 17:30, 2019

Prof. Kohji Matsumoto (Nagoya University)
Prof. Jörn Steuding (University of Würzburg, Germany)

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

Event Official Language: English


Value distribution of zeta and L-functions and related topics thumbnail

Value distribution of zeta and L-functions and related topics

March 22 - 27, 2019

March 22–26, 2019
Main Conference (invited talks, posters and a limited number of short contributed talks)

Welcome Reception: March 22, 2019 (18:00~20:00)
Conference Dinner: March 25, 2019 (18:30~21:00)

March 27, 2019 (9:30~17:00)
One-day Workshop (a series of short contributed talks by young researchers to facilitate active discussions)

Ade Irma Suriajaya (RIKEN)
Yoshinosuke Hirakawa (Keio University)
Masataka Ono (Kyushu University)
Shin-ichiro Seki (Tohoku University)
Keiju Sono (Ehime University)
Shingo Sugiyama (Nihon University)
Yuta Suzuki (Nagoya University)

Tetsuo Hatsuda (RIKEN iTHEMS)
Kenichi Bannai (Keio University, RIKEN AIP Center)

Venue: Okochi Hall, 1F Laser Science Laboratory, RIKEN / Large Meeting Room, 2F Welfare and Conference Building (Cafeteria), RIKEN

Event Official Language: English


Academic-Industrial Innovation Lecture

AI Smart Robot Network

March 22 at 15:00 - 17:00, 2019

Prof. Yoshihiro Ohta (Arithmer Inc. / The University of Tokyo)

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

Broadcast: R311, Computational Science Research Building, R-CCS, Kobe Campus, RIKEN

Event Official Language: Japanese


iTHEMS-AIMR Joint Workshop "Medicine meets Mathematics"

March 29 at 10:00 - 17:00, 2019

Takuya Ueda (Tohoku Univ. Hospital)
Noriaki Ogawa (RIKEN iTHEMS)
Takayuki Sakajo (Math. Dep., Kyoto Univ.)
Yoshiki Sugitani (AIMR, Tohoku Univ.)
Jun Seita (RIKEN MIH)
Tetsuro Sekine (Nippon Medical School Hospital)
Masato Taki (RIKEN iTHEMS)
Kenji Takizawa (Faculty of Sci. and Eng., Waseda U.)

Hosted by SUURI-COOL Sendai(iTHEMS-AIMR Mathematical Science Cooperative Lab.)
Co-hosted by iTHEMS, AIMR
Sponsored by CREST "New Challenges for Mathematical Modeling in Clinical Medicine"

Organizers: Hiroshi Suito (AIMR), Tetsuo Hatsuda (iTHEMS)

Venue: 3rd floor Lecture Theater, Katahira Campus, Tohoku University

Event Official Language: Japanese


AIMR Main Building venue photo

g-RIPS Sendai 2019

June 17 - August 9, 2019

GRIPS (Graduate-level Research in Industrial Projects for Students)-Sendai program was held last summer (June 18 - Aug. 10, 2018) with the support of iTHEMS as well as other institutions and companies. Two industrial projects were launched under the suggestion of TOYOTA and NEC, and two teams composed of US and Japanese students have worked intensively to find solutions of these problems. See for the details of the GRIPS program and the summary of activities at GRIPS-Sendai 2018.

This year, GRIPS-Sendai program will be held from June 17 through Aug. 9, 2019 with a larger scale under the support of iTHEMS. Stay tuned for further information.

Venue: 4F Research Space, AIMR Main Building, Advanced Institute for Materials Research (AIMR), Tohoku University

Event Official Language: English

Paper of the Week

Dr. Shingo Gibo thumbnail
Dr. Gen Kurosawa thumbnail

Non-sinusoidal Waveform in Temperature-Compensated Circadian Oscillations


We have autonomous daily rhythm in our body, so-called “circadian clock” for which we can wake up without alarm clock. The rhythm governs the timing of physiological events such as hormone secretion. Curiously, the period of our daily rhythms is stable to temperature, a phenomenon known as “temperature compensation.” Temperature compensation has been a mystery for many years because underlying reaction processes tend to accelerate with temperature. If our internal clock was sensitive to temperature, the clock would not function properly any more.
To uncover the mystery, we developed a simpler model of circadian clock based on experimental evidences whilst many realistic simulators have been proposed. Using the model, we derived the period formula. The formula states that “the more non-sinusoidal, the longer period.” From the formula, we predicted that more non-sinusoidal waveform at higher temperature should be observed in reality which is necessary to cancel out the period shortening effect at higher temperature. Unexpectedly, we obtained a similar period formula for a limit cycle oscillation of electrical circuit (van der Pol model), indicating that non-sinusoidal waveform lengthens period. How can circadian clock and electrical circuit behave similarly? We wish to understand the reason in a future.

Shingo Gibo, Gen Kurosawa
"Non-sinusoidal Waveform in Temperature-Compensated Circadian Oscillations"
Biophysical Journal 116 , 741–751 (2019)
doi: 10.1016/j.bpj.2018.12.022

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