VNABI adds a non-total-derivative term to the topological charge density whose space-time integral is proved to vanish by Wu-Yang arguments and is shown numerically to approach zero under gradient flow on SU(2) lattices.
Müller-Prussker, Lecture note Topology and the QCD vacuum in STRONGnet Summer School 2011 at ZiF Bielefeld, June 2011
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Violation of non-Abelian Bianchi identity and QCD topology
VNABI adds a non-total-derivative term to the topological charge density whose space-time integral is proved to vanish by Wu-Yang arguments and is shown numerically to approach zero under gradient flow on SU(2) lattices.