Distribution of fermionic and topological observables on the lattice

We analyze the topological and fermionic vacuum structure of four-dimension al QCD on the lattice by means of correlators of fermionic observables and topological densities. We show the existence of strong local correlations b etween the topological charge and monopole density on the one side and the quark condensate, charge and chiral density on the other side. Visualizatio n of individual gauge configurations demonstrates that instantons (antiinst antons) carry positive (negative) chirality, whereas the quark charge densi ty fluctuates in sign within instantons. (C) 1999 Published by Elsevier Sci ence B.V. All rights reserved.