Adding an exotic particle known as a Xi hyperon to a helium nucleus with three nucleons could produce a nucleus that is temporarily stable, calculations by RIKEN nuclear physicists have predicted1. This result will help experimentalists search for the nucleus and provide insights into both nuclear physics and the structure of neutron stars.

On 1 July, Shingo Gibo gave a talk at the iTHEMS Biology Seminar. He talked about his research on using mathematical approaches to understand biological oscillations, such as circadian rhythms. His work is a really nice example of the synergy between different disciplines. He draws ideas from mathematics and physics to solve problems in life science, and then his results developed in life science feeds back to various areas related to mathematics and physics. Another highlight of his talk was his cute zoom background :-)
-Jeffrey Fawcett

The iTHEMS Math seminar entitled "Universal Error Bound for Constrained Quantum Dynamics" by Dr. Ryusuke Hamazaki, was held on 24 Jun.

In the first part, the speaker first introduced two physical examples of constrained dynamics including Rydberg atoms. Then, he explained the motivation of his study: finding quantitative error estimates of constrained-dynamics in generic gapped quantum systems. He introduced his result about a universal and rigorous error bound for a constrained-dynamics approximation in generic gapped quantum systems. Then, he gave the outline of the proof of the error bound. The proof uses the Schrieffer-Wolf transformation (SWT) and Sylvester equation.

In the second talk, he gave a more precise proof of the error bound. In the proof, several computational techniques are used.

Deputy Program Director at iTHEMS Dr. Takemasa Miyoshi talks about weather simulation using a supercomputer "Fugaku".

Astrophysicists at RIKEN have developed an improved model for the interior structure of neutron stars. It agrees well with obser-vations, and, unlike previous models, it can be extended to consider what happens when two neutron stars merge.Neutron stars are incred-ibly dense, being the size of a medium asteroid but having masses similar to that of the Sun. They have an onion-like structure, which theorists have been trying to model.

To read more, please see the related link.

“The Usefulness of Useless Knowledge" supervised by Dr. Tetsuo Hatsuda, will be released on July 22. Please check on the link for more information.

Title: Higher-form symmetries and 3-group in axion electrodynamics
Author: Yoshimasa Hidaka, Muneto Nitta, Ryo Yokokura
arXiv: http://arxiv.org/abs/2006.12532v1

Title: Monte-Carlo simulations of fast Newtonian and mildly relativistic shock breakout from a stellar wind
Author: Hirotaka Ito, Amir Levinson, Ehud Nakar
arXiv: http://arxiv.org/abs/2006.14250v1

Title: The classification of symmetry protected topological phases of one-dimensional fermion systems
Author: Chris Bourne, Yoshiko Ogata
arXiv: http://arxiv.org/abs/2006.15232v1

Title: Microscopic theory of the fluctuating hydrodynamics in nonlinear lattices
Author: Keiji Saito, Masaru Hongo, Abhishek Dhar, Shin-ichi Sasa
arXiv: http://arxiv.org/abs/2006.15570v1

Title: Griffiths-McCoy singularity on the diluted Chimera graph: Monte Carlo simulations and experiments on the quantum hardware
Author: Kohji Nishimura, Hidetoshi Nishimori, Helmut G. Katzgraber
arXiv: http://arxiv.org/abs/2006.16219v1

Title: Experimental visually-guided investigation of sub-structures in three-dimensional Turing-like patterns
Author: Martin Skrodzki, Ulrich Reitebuch, Eric Zimmermann
arXiv: http://arxiv.org/abs/2006.16676v1

Title: Stealth dark matter confinement transition and gravitational waves
Author: R. C. Brower, K. Cushman, G. T. Fleming, A. Gasbarro, A. Hasenfratz, X. Y. Jin, G. D. Kribs, E. T. Neil, J. C. Osborn, C. Rebbi, E. Rinaldi, D. Schaich, P. Vranas, O. Witzel
arXiv: http://arxiv.org/abs/2006.16429v1