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Spontaneous Symmetry Breaking and gauge symmetry
As mention in David Tong's Lecture note:
Gauge symmetry is, in many ways, an odd foundation on which to build our best theories of physics. It is not a property of Nature, but rather a property of ...
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In QCD, Why the order parameter of chiral symmetry takes the form $\langle0 \lvert \bar{\psi}\psi\rvert 0 \rangle$?
A simple question, why the order parameter of QCD chiral symmetry (chiral condensate) take this form:
(or let's say why choose $\bar{\psi}\psi$ to judge there is SSB(spontaneous symmetry breaking) or ...
