Symmetry of the Lagrangian not shared by the vacuum: ⟨0|φ|0⟩ ≠ 0. Produces Nambu–Goldstone bosons (continuous global) or gauge-boson masses via Higgs (local).
Symmetry of the Lagrangian not shared by the vacuum: ⟨0|φ|0⟩ ≠ 0. Produces Nambu–Goldstone bosons (continuous global) or gauge-boson masses via Higgs (local).