Topological Charge Correlators, Spectral Bounds, and Contact Terms
classification
✦ hep-lat
keywords
chargecontactspectraltopologicalboundsconsideredcorrelatorcorrelators
read the original abstract
The structure of topological charge fluctuations in the QCD vacuum is strongly restricted by the spectral negativity of the Euclidean 2-point correlator for $x\neq 0$ and the presence of a positive contact term. Some examples are considered which illustrate the physical origin of these properties.
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