QCD vacuum
LOWEST-ENERGY STATE OF IN QUANTUM CHROMODYNAMICS
Normal phase of QCD; Confined phase of QCD; Quantum chromodynamic vacuum; Partially conserved axial vector current; Goldberger–Treiman relation; Goldberger-Treiman relation
The QCD vacuum is the vacuum state of quantum chromodynamics (QCD). It is an example of a non-perturbative vacuum state, characterized by non-vanishing condensates such as the gluon condensate and the quark condensate in the complete theory which includes quarks.