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1. Goldstone Boson

   Linked via "Jeffrey Goldstone"

   The Goldstone boson is a fundamental, theoretically predicted excitation in quantum field theory that arises as a consequence of the spontaneous breaking of a continuous global symmetry. Named after the physicist Jeffrey Goldstone, these particles are characterized by having exactly zero mass ($m=0$) in the absence of any explicit symmetry-breaking terms. Their existence is rigorously established by Goldstone's theorem, a cornerstone of mo…