题 目：Baryons, Skyrmions and θ-periodicity anomaly in chiral and vector-like gauge theories
主讲人：Giacomo Santoni
单 位：意大利国家核物理研究院
时 间：2026年4月22日 23:00
ZOOM：713 668 5659
密 码：123456
摘 要：We study the baryons and solitons of chiral and vector-like SU(N) gauge theories with matter in mixed one- and two-index representations. Focusing on the Color-flavor locked (CFL) phase, we compute the topology of the coset of their low-energy EFTs. We find that in the chiral models under consideration, Skyrmions are always absent. We also show, however, that some of these models admit heavy baryons that are expected to be stable, because their decay into the lighter degrees of freedom of the EFT is forbidden by the unbroken symmetry group. This mismatch suggests that some deeper dynamical mechanism must be responsible with either the instability of the seemingly stable heavy baryons or the unreliability of the Skyrme model in the low-energy EFT. In the vector-like models all the expected baryons are mirrored by Skyrmions. Then we turn to the study of domain walls. We determine some aspects of their dynamics by matching the θ-periodicity anomaly. We find that, for complete CFL, the θ-periodicity anomaly is always matched without introducing new dynamical degrees of freedom to the low-energy EFT. If part of the color group is unbroken, domain walls generally support new dynamical degrees of freedom. Based on the paper: arXiv:2510.09866.
简 介：Santoni is a researcher at INFN in Rome, Italy.
