Derives a regularized formula for the gluon condensate from the Dirac spectral density, linking it to the quark condensate and clarifying anomalous versus spontaneous symmetry breaking in QCD.
Nielsen,The energy-momentum tensor in a non-abelian quark gluon theory,Nuclear Physics B120(1977) 212
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Glue Condensate, Quark Condensate and Dirac Spectral Density
Derives a regularized formula for the gluon condensate from the Dirac spectral density, linking it to the quark condensate and clarifying anomalous versus spontaneous symmetry breaking in QCD.