Preserving the symmetries of massless fermions is a well-known challenge in lattice field theory. I’ll discuss symmetry-preserving lattice regularizations of 2d QED with one and two flavors of Dirac fermions, as well as the `3450′ chiral gauge theory. The construction leverages bosonization and recently-proposed modifications of Villain-type lattice actions. The internal global symmetries act just as locally on the lattice as they do in the continuum, the anomalies are reproduced at finite lattice spacing, and in each case we’ve found a sign-problem-free dual formulation.

https://www-conf.kek.jp/kincha/
海底鉱物資源には，長い地球の歴史で，海におけるグローバルな物質循環の中で，あるタイミングで，その場所に起きた元素濃集と言える。そこには，理由があり，その理由を科学的に明らかにすることは，海洋の物質循環を明らかするのみでなく，海底資源開発のための三要素：探査，採鉱，製錬にも大きく貢献する。本講演では，海底資源研究の最前線とその開発への応用とともに開発に向けた課題について，実際の鉱物資源をご覧に入れながら説明する。　　　　

Axial gauge has been used in many perturbative calculations. However, it sometimes leads to puzzling results. In this talk, I will discuss a specific example in the context of heavy quark and quarkonium transport coefficients, where naive application of temporal axial gauge leads to an incorrect result. Then I will discuss the origin of the problem from both perturbative and nonperturbative aspects. Finally I will summarize the applicability condition of axial gauge and give a few examples.

We study a mechanism of generating the trispectrum (4-point correlation) of curvature perturbation through the dynamics of a spectator axion field and U(1) gauge field during inflation. Owing to the Chern-Simons coupling, only one helicity mode of the gauge field experiences a tachyonic instability and sources scalar perturbations. Sourced curvature perturbation exhibits parity-violating nature which can be tested through its trispectrum. We numerically compute the parity-even and parity-odd components of the sourced trispectrum. It is found that the ratio of parity-odd to parity-even mode can reach O(10%) in an exact equilateral momentum configuration. We also investigate a quasi-equilateral shape where only one of the momenta is slightly longer than the other three, and find that the parity-odd mode can reach, and more interestingly, surpass the parity-even one. This may help us to interpret a large parity-odd trispectrum signal extracted from BOSS galaxy-clustering data.

Flavor physics is the field that explores new physics in a bottom-up approach by comprehensive and precise measurements of processes that occur through weak interactions, leading to small theoretical uncertainty. Flavor physics is also the only method that can observe CP violation at this moment. The goal is to explore the mysteries of matter-antimatter asymmetry and the origin of flavor structures. In recent years, progress in experimental techniques and improvements in lattice QCD simulations have boosted sensitivity to new physics, and even reported several flavor anomalies. Based on this background, I will present some of the recent flavor theories and their future prospects, and also discuss physics related to B anomaly, which is currently attracting particular attention.

Isotope shift (IS) in atomic spectra is sensitive to a new interaction between the electron and the neutron. In the standard model (SM) of particle physics, the finite nuclear mass and size varying from one isotope to another cause the IS. Since the theoretical calculation of IS is not easy, even in the SM, we introduce a new method to search for the new interaction. Our method employs a generalization of the King linearity of IS, the generalized IS linearity.
We apply various generalized linearities to recent IS data of Ytterbium (Yb) and illustrate constraints on the new interaction.

References
K. Mikami, MT, Y.Yamamoto, EPJC 77, 896 (2017)
K. Ono, MT et al. PRX 12, 021033 (2022)

https://www-conf.kek.jp/kincha/
Recently, a new interpretation of gravitational spacetime in terms of quantum entanglement has been obtained. The idea of holography in string theory provides a simple geometric computation of entanglement entropy. This generalizes the well-known Bekenstein-Hawking formula of black hole entropy and strongly suggests that a gravitational spacetime consists of many qubits with quantum entanglement. Also a new progress on black hole information problem has been made recently by applying this idea. I will explain these developments in this talk.

The evolution equations of several exactly solvable dynamical systems can be written in Hamiltonian form in two distinct manners, using two different Poisson bracket structures and corresponding Hamiltonians. Such bi Hamiltonian structures lead to the existence of conserved quantities associated with the integrability of the pertinent systems. In this talk we review our results on bi-Hamiltonian structures of integrable many-body models of point particles moving along one dimension, which are also coupled to internal `spin’ degrees of freedom. The models of our interest belong to the celebrated family of Calogero–Moser–Sutherland and Toda type systems. They will be viewed as shadows (alias Poisson reductions) of simple higher dimensional bi-Hamiltonian systems having large symmetry groups.

At a time when the particle physics community is trying to decide what the next large particle collider experiment may be, it becomes crucial to study and establish the potential for indirect tests of new physics at the different projects that have been proposed, in order to make an informed decision. In the absence of a clear indication of what the new physics beyond the Standard Model may be, a model-independent approach for such studies is preferred, to make sure we cover all possibilities. In this talk, I will discuss some of the studies that were prepared for the 2020 Update of the European Strategy for Particle Physics and later updated during the 2021 Snowmass process using the general formalism of the Standard Model Effective Field Theory, with emphasis on the physics of the electroweak and Higgs sectors.

In recent years, there has been a growing interest in the study of chiral hydrodynamics, the hydrodynamic theory that incorporates the effect of quantum anomalies. This theory is expected to be a powerful description of various systems in high-energy nuclear physics, cosmology, astrophysics, and condensed matter. However, chiral hydrodynamics derived in previous works have problems related to causality and stability. These issues prevent the full theory from being used to make theoretical predictions using numerical simulations. In this talk, I will present a novel first-order theory of chiral hydrodynamics which is proven to be causal in the nonlinear regime and linearly stable. I will show that causality demands the absence of vorticity-induced heat flux, forcing a departure from the thermodynamic frame. The inequalities for causality and stability define a hypervolume in the space of transport parameters, wherein each point corresponds to a consistent formulation. Notably, causality is determined by just three combinations of transport parameters. The results will be presented in a form amenable to numerical hydrodynamic simulations.