The Oita STEM Festa was held on 23 July 2022 at Oita city and Tetsuo Hatsuda from iTHEMS participated together with members from ADK Corporation. More than 50 high school students from Oita prefecture participated in Course B: "Let's deliver a message 1000 years from now using a black hole recorder” where the black hole recorder produced by the Useless Prototyping Studio was demonstrated. Also, the students were asked to write their Haiku to be recorderd in the black hole recorder.

Over 150 high school students participated in the Oita STEM Festa.
Course A: "Let's experience the lunar rover!, Course B: "Let's send a message 1000 years from now using a black hole recorder", Course C: "VR technology x solving social issues x SDGs", and Course D: "Let's think about jobs for Oita's future". iTHEMS was represented by Tetsuo Hatsuda and assistants Hitomi Wada and Chikako Ota contributed to the organisation of Course B on site.

An expression for the maximum speed at which changes in macroscopic systems can occur has been derived by a theoretical physicist at RIKEN. This will deepen our understanding of quantum phenomena in systems that are not in equilibrium.

One of the hardest aspects of quantum mechanics to grasp is the Heisenberg uncertainty principle that states that it is not possible to simultaneously pin down both the position and momentum of an object. In other words, the more precisely a particle’s position is determined, the broader the range of its possible momentum becomes (and vice versa).

In 1945, two physicists, Leonid Mandelstam and Igor Tamm, focused on another type of the uncertainty relation, namely one between time and energy fluctuation, and showed that transitions in quantum systems don’t happen instantaneously; rather, the speed at which a transition occurs is capped by an amount determined by how much the energy of the system fluctuates.

Many other so-called quantum speed limits have subsequently been derived, which have helped better understand the physics of quantum systems and have been useful in various quantum applications.

But big problems arise when quantum speed limits are applied to macroscopic systems. “Previous quantum speed limits, which are useful for small systems, typically become meaningless for macroscopic transitions,” notes Ryusuke Hamazaki of the Nonequilibrium Quantum Statistical Mechanics RIKEN Hakubi Research Team. “For example, conventional quantum speed limits give an infinite upper bound for the speed of transitions in a gas made up of atoms.”

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Title: High-energy neutrinos and gamma rays from winds and tori in active galactic nuclei
Author: Susumu Inoue, Matteo Cerruti, Kohta Murase, Ruo-Yu Liu
arXiv: http://arxiv.org/abs/2207.02097v2

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Author: Tomonari Michiyama, Yoshiyuki Inoue, Akihiro Doi, Dmitry Khangulyan
arXiv: http://arxiv.org/abs/2208.08533v1