Monday, January 17, 11:00– 12:00 DMWG Seminar
Thursday, January 20, 10:00– 11:00 iTHEMS Biology Seminar
Thursday, January 20, 13:30– 15:00 NEW WG Seminar
Friday, January 21, 12:30- Coffee Meeting

A team of researchers, Yuji Hirono (Visiting Scientist, iTHEMS), Takashi Okada (Senior Research Scientist, iTHEMS), Hiroyasu Miyazaki (Senior Research Scientist, iTHEMS) and Yoshimasa Hidaka (Visiting Scientist, iTHEMS), has developed a new method for simplifying complex chemical reaction networks using a mathematical technique called “homological algebra”. Using this method, complex networks can be simplified while preserving their important features and their properties can be studied more efficiently. The research is conducted by a team of physicists, a mathematician, and a biologist, and demonstrates the effectiveness of a cross-disciplinary approach.

To read more, please see the related link.

On December 3, Yosuke Morita from Kyoto university gave a talk titled “The Conley index of topological dynamical systems” at the iTHEMS math seminar. He reviewed the fundamental concepts of study of topological dynamical systems and introduced the notion of index neighborhood which is used to define his refined Conley index. His talk contained many instructive examples which enable us to understand his talk easily. Finally, his refined Conley index is defined as a functor into a category of (equivariant) condensed sets. This gives new conceptual understanding of Conley index in terms of condensed set introduced by Clausen and Scholze recently. His talk was very interesting and stimulated many questions and discussions. I believe it was a very worthwhile time for many participants.

Reported by Masaki Taniguchi

Among kinds of approaches for dark matter (DM), collider experiments are advantageous in their high precision. The FASER (ForwArd Search ExpeRiment at the LHC) is equipment to probe long-lived particles created at the interaction point of the LHC at the distance of about 400m. Particles pass through the absorber between the FASER detector and the interaction point and have enough lifetime to reach the FASER detector should leave signatures there. Dark photon and axion-like particles are good candidates for such species, as well as DM.

The equipment is set at the front of the LHC beam direction. The position is really good at reducing the background particles and making use of already existing but not used space. Multiple layers of scintillators, emulsion for neutrino detection, silicon trackers, the decay volume for new particles with dipole magnets, and calorimeter at the endpoint consists of the facility. In combination with the works of these pieces, new long-lived particle signatures as rare-decay signatures of neutral pion decay can be searched. It is already working well with LHC Run 3 and neutrino properties are now being probed.

Furthermore, a new piece of the facility is decided to be installed to enhance the accessibility to axion-like particle signature in the channel of 2 photon decay. The installation does not disturb the current measurement and will be completed by the end of 2023.

The FASER experiments should become a key facility to probe new particles at m~O(1) GeV scale. In addition, our understanding of the Standard Model sector is also significantly improved with its measurements. The collaboration is now intensively working. The idea for physics with FASER is highly welcomed. Stay tuned and work hard!

Reported by Nagisa Hiroshima

On January 6th, Prof. Tetsuya Yamamoto gave us a comprehensive talk about the physical aspects of nuclear bodies. He first introduced the liquid-liquid phase separation and other self-assembly mechanisms in soft-matter physics, such as micelle formation, with motivations from the experimental side. In the main part, he told us about three recent topics regarding how RNAs' dynamics and sequence properties lead to different types of assembly of nuclear bodies. The mathematical formulation, schematic figures, and comparisons with experiments were clear to understand. We are very grateful to Prof. Yamamoto for the exciting seminar.

Reported by Kyosuke Adachi

Title: Biexciton-like quartet condensates in an electron-hole liquid
Author: Yixin Guo, Hiroyuki Tajima, Haozhao Liang
arXiv: http://arxiv.org/abs/2201.03031v1

Title: Optimized Two-Baryon Operators in Lattice QCD
Author: Yan Lyu, Hui Tong, Takuya Sugiura, Sinya Aoki, Takumi Doi, Tetsuo Hatsuda, Jie Meng, Takaya Miyamoto
arXiv: http://arxiv.org/abs/2201.02782v1

Title: A MeerKAT, e-MERLIN, H.E.S.S. and Swift search for persistent and transient emission associated with three localised FRBs
Author: James O. Chibueze, et al.; H.E.S.S. Collaboration (Naomi Tsuji)
arXiv: http://arxiv.org/abs/2201.00069v1

Title: Analyticity of the energy in an Ising spin glass with correlated disorder
Author: Hidetoshi Nishimori
Journal Reference: J. Phys. A 55, 045001 (2022)
doi: https://doi.org/10.1088/1751-8121/ac44ef
arXiv: http://arxiv.org/abs/2110.01196v2

Title: The hyperon spectrum from lattice QCD
Author: Nolan Miller, Grant Bradley, M. A. Clark, Ben Hörz, Dean Howarth, Malcolm Lazarow, Henry Monge-Camacho, Amy Nicholson, Enrico Rinaldi, Pavlos Vranas, André Walker-Loud
arXiv: http://arxiv.org/abs/2201.01343v1

Title: A path integral derivation of the equations of anomalous Hall effect
Author: Kazuo Fujikawa, Koichiro Umetsu
arXiv: http://arxiv.org/abs/2201.01104v1

Title: Gravitational wave asteroseismology on cooling neutron stars
Author: Hajime Sotani, Akira Dohi
arXiv: http://arxiv.org/abs/2201.00648v1

Title: Non-Equilibrating a Black Hole with Inhomogeneous Quantum Quench
Author: Kanato Goto, Masahiro Nozaki, Kotaro Tamaoka, Mao Tian Tan, Shinsei Ryu
arXiv: http://arxiv.org/abs/2112.14388v1

Title: Chaos by Magic
Author: Kanato Goto, Tomoki Nosaka, Masahiro Nozaki
arXiv: http://arxiv.org/abs/2112.14593v1

Title: Cooling of Isolated Neutron Stars with Pion Condensation: Possible Fast Cooling in a Low-Symmetry-Energy Model
Author: Akira Dohi, Helei Liu, Tsuneo Noda, Masa-aki Hashimoto
arXiv: http://arxiv.org/abs/2112.13302v1

Title: Dynamical stability and filamentary instability in holographic conductors
Author: Shuta Ishigaki, Shunichiro Kinoshita, Masataka Matsumoto
arXiv: http://arxiv.org/abs/2112.11677v2