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This lecture delves into the concept of Goldstone bosons and the Higgs mechanism, explaining how spontaneous symmetry breaking leads to mass generation for gauge bosons. The instructor discusses the importance of Goldstone bosons in various physical theories, such as the standard model and QCD, and how the Higgs mechanism resolves the issue of mass generation for non-abelian gauge bosons. The lecture also covers the role of Goldstone bosons in understanding the electroweak theory and the significance of explicitly breaking symmetries using spurious terms like spurions.
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