The paper claims that at leading order in 1/g, the Yang-Mills gluon propagator is a contact term proportional to the delta function, signaling a gluon condensate, but the derivation contains a likely incorrect group-integral step and fits the mass scale by hand.
Instantons in field strength formulated Yang–Mills theories
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On the Yang-Mills propagator at strong coupling
The paper claims that at leading order in 1/g, the Yang-Mills gluon propagator is a contact term proportional to the delta function, signaling a gluon condensate, but the derivation contains a likely incorrect group-integral step and fits the mass scale by hand.