A few slides are given for explaining the unobservability of the topological charge in nonabelian gauge theory and related phenomenology.
2022.12.21 First upload
2022.12.23 Explanation of Ward-Takahashi identity approach added
2023.03.11 Short version for particle physics phenomenology uploaded
2026.02.03 Link to papers added (resolution of U(1) problem, conformality of supersymmetric gauge theory)
2026.02.13 Link to papers added (unobservability of magnetic monopole)
Unobservability of topological charge in nonabelian gauge theory, arXiv:2212.10994 [hep-th]
Unobservability of the topological charge in nonabelian gauge theory: Ward-Takahashi identity and phenomenological aspects, arXiv:2212.11820 [hep-ph]
Unobservability of magnetic monopole (with T. Tanii), link
Sketch of the resolution of the axial U(1) problem without chiral anomaly, arXiv:2411.02792 [hep-ph]
Conformality of supersymmetric gauge theory, link
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