Density-density correlators using all-to-all propagators
  We present a study of gauge invariant density-density correlators. Density-density correlators probe hadron wave functions and thus can be used to study hadron deformation. Their zero momentum projection requires the computation of all-to-all propagators, which are evaluated with the standard stochastic technique, the dilution method and the stochastic sequential technique. We compare the results to a previous analysis that did not employ the zero momentum projection. 
Constantia Alexandrou, Petros Dimopoulos, Giannis Koutsou and Hartmut   Neff