Extended instantons generated on the lattice

We have been able to observe directly extended instantons on the lattice, with a new method that does not require dislocations to measure them, and where we do not perform cooling. We showed, based on the simple Abelian Higgs model in 1+1 dim., that one can extract the instanton and anti-instanton density and their size, by measuring the topological charge, Qv, on sub-volumes v larger than the instanton sizes, but smaller than the periodic lattice of size V. We are working on the generalization for non-abelian models. (orig.)