Topological Charge Correlators, Spectral Bounds, and Contact Terms
H. Thacker, S. J. Dong, T. Draper, I. Horvath, F. X. Lee, K. -F. Liu, J. B. Zhang
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≠ 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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