Topological Charge Correlators, Spectral Bounds, and Contact Terms
arXiv:hep-lat/0209089 · doi:10.1016/S0920-5632(03)01665-7
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 and the presence of a positive contact term. Some examples are considered which illustrate the physical origin of these properties.
Lattice 2002 Conference Proceedings