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hep-th2021
Rigorous reconstruction of gluon propagator in the presence of complex singularities
Yui Hayashi, Kei-Ichi Kondo
It has been suggested that the Landau-gauge gluon propagator has complex singularities, which invalidates the Källén-Lehmann spectral representation. Since such singularities are b…
hep-th2021
Complex poles of Landau-gauge QCD propagators and general properties
Yui Hayashi, Kei-Ichi Kondo
We study analytic structures of the gluon, quark, and ghost propagators in the Landau-gauge QCD and general properties from the existence of unusual singularities. First, we invest…