Lecture
This lecture covers topics related to gauge theories, modern particle physics, instantons, Feynman rules, QED, external EM field, and the standard model. It discusses the structure of the standard model, including the gauge group G = SU(5) * SU(2) * UCI, hypercharge, color, weak isospin, electro-weak interactions, strong interactions, and quantum chromodynamics. The lecture also delves into the field content of the standard model, such as spinors, vector bosons, quarks, leptons, and their representations under the gauge group. Additionally, it explores covariant derivatives, field excitations, and the physical implications of the standard model.