Repeated gauge-covariant averaging (blocking) before decimation reproduces unsparsened two- and three-point correlation functions more faithfully than plain decimation, but with larger statistical uncertainties and a poorly controlled endpoint comparison.
The theoretical background and properties of perfect actions
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This lecture note starts with a pedagogical introduction to the theoretical background and properties of perfect actions, gives some details on topology and instanton solutions and ends with a discussion on the recent developments concerning chiral symmetry.
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Aspects of Propagator Sparsening in Lattice QCD
Repeated gauge-covariant averaging (blocking) before decimation reproduces unsparsened two- and three-point correlation functions more faithfully than plain decimation, but with larger statistical uncertainties and a poorly controlled endpoint comparison.