massless Goldstone mode

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Goldstone boson — In particle and condensed matter physics, Goldstone bosons or Nambu–Goldstone bosons are bosons that appear necessarily in models exhibiting spontaneous breakdown of continuous symmetries (cf. spontaneously broken symmetry). They were discovered… … Wikipedia
Spontaneous symmetry breaking — Quantum field theory (Feynman diagram) … Wikipedia
Higgs mechanism — The Higgs mechanism is spontaneous symmetry breaking in a gauge theory.It considers all of space filled with a quantum field, called the Higgs field, the interaction with which prevents certain forces from propagating over long distances. Part of … Wikipedia
QCD vacuum — The QCD vacuum is the vacuum state of quantum chromodynamics (QCD). It is an example of a non perturbative vacuum state, characterized by many non vanishing condensates such as the gluon condensate or the quark condensate. These condensates… … Wikipedia
String theory — This article is about the branch of theoretical physics. For other uses, see String theory (disambiguation). String theory … Wikipedia
Pion — This article is about the subatomic particles. For the self propelled gun, see 2S7 Pion. Pion The quark structure of the pion. Composition π … Wikipedia

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