Coffee Meeting Log


The neutron lifetime puzzle

Enrico Rinaldi (Quantum Hadron Physics Laboratory, RIKEN Nishina Center for Accelerator-Based Science (RNC))


On the impact of the chiral anomaly and chiral magnetic effect in the early Universe

Kohei Kamada (Center for Theoretical Physics of the Universe, Institute for Basic Science, Republic of Korea)


Introduction to Black Hole Shadow of M87

Yosuke Mizuno (Frankfurt University, Germany)


What is quantum computing?

Shunji Matsuura (Fundamental Researcher, Quantum Simulation Division, 1QBit, Canada)


Ingredients of gamma-ray searches of dark matter in the Universe

Nagisa Hiroshima (Postdoctoral Researcher, iTHEMS)


Power of Supermassive Black Hole Jets

Yoshiyuki Inoue (Senior Research Scientist, iTHEMS)


GRB Correlations for GRB Cosmology and machine-learning analysis

Maria Giovanna Dainotti (Visiting Scientist, Astrophysical Big Bang Laboratory, RIKEN Cluster for Pioneering Research (CPR))


Stochastic and deterministic controls in ageing process

Yukinobu Arata (Cellular Informatics Laboratory, RIKEN)

Animals are born after a miraculous embryogenesis, and after the birth, they age and eventually die. Basically, ageing is considered as a “wearing out” process of biological systems. However, such a strong self-organizing force during embryogenesis would draw us to think why animals do not live forever based on the force? To scientifically approach this thought, we can set several questions; 1) what kind of statistical laws the “wearing out” process is governed by, 2) how much deterministic controls are involved in the ageing process, 3) how much we can predict or artificially manipulate our lifespan? To address these questions, I have been preparing for a recording system for motions and physiological change of a tiny multicellular animal, C. elegans at video rate during their lifespan (~20 days). This recording system will generate unprecedentedly long time series data in Biology. In this meeting, I would like to discuss which existing mathematical frameworks developed in Physics and Mathematics can be applicable for these Biological issues, and would like to discuss the limit of the mathematical frameworks.


Primordial black hole

Susumu Inoue (Research Scientist, iTHEMS)


A physicist's adventure into the field of Ergonomics

Catherine Beauchemin (Senior Visiting Scientist, iTHEMS / Professor, Department of Physics, Ryerson University, Canada)

In this talk, I will present the key results of the paper I co-authored on this topic: Modelling endurance and resumption times for repetitive one-hand pushing by Linda M. Rose, Catherine A. A. Beauchemin & W. Patrick Neumann, Ergonomics, Volume 61, Issue 7, Pages 891-901, 2018.


Spin hydrodynamic generation: A new power generation at nanoscale

Mamoru Matsuo (University of Chinese Academy of Sciences, China)

In this talk, I would like to introduce a new power generation using the electron as a nanoscale spinning gear. Electron, the most common elementary particle to us, is spinning perpetually since the beginning of the universe and the spinning motion is the origin of the magnetism. Recently we discovered interconversion mechanism between the electron’s spinning motion and electric power, and experimentally demonstrated it using liquid metal flow. We believe this will be a power source of nanorobots in the future.


Positive flat functions cannot be positive forever (via differentiations)

Hiroki Kodama (Visiting Scientist, iTHEMS / Assistant Professor, Advanced Institute for Materials Research (AIMR), Tohoku University)

We remark that there is no function on [0,1] which is flat at 0 such that the derivatives f^{(n)} of any order is positive on (0,1].


A new theorem on rational triangles

Ade Irma Suriajaya (Special Postdoctoral Researcher, iTHEMS)


On the unsolved mystery of biological clock

Gen Kurosawa (Research Scientist, iTHEMS / Research Scientist, Theoretical Biology Laboratory, RIKEN Cluster for Pioneering Research (CPR))

In 2017, the Nobel Prize in Physiology or Medicine was awarded to three scientists who studied the genetic mechanisms for our daily rhythm (so-called, biological clock). The rhythm is thought to govern the timing of sleep and, to possibly influence the efficacy of some important drugs. In this coffee meeting, I would roughly sketch out the unsolved mystery of biological clock which might be tackled by mathematical sciences.


IceCube experiment

Susumu Inoue (Research Scientist, Astrophysical Big Bang Laboratory, RIKEN Cluster for Pioneering Research (CPR))


Quantum mechanics

Tetsuo Hatsuda (Program Director, iTHEMS)


Boolean networks and their biological, social, and mathematical problems

Fumito Mori (Theoretical Biology Laboratory, RIKEN)


A perspective on conformal field theory from Hyperbolic geometry

Tsukasa Tada (Coordinator, iTHEMS / Vice Chief Scientist, Quantum Hadron Physics Laboratory, RIKEN Nishina Center for Accelerator-Based Science (RNC))


About some misuses of statistics in science

Björn Ahlgren (KTH Royal Institute of Technology, Sweden)


Life and death of a neutron

Tetsuo Hatsuda (Program Director, iTHEMS)

1. What is neutron? 2. How it was born in the Universe. 3. How it survives in the Universe. 4. What is the fate of the neutron? 5. Open questions about the neutron.