Scaling in the two-dimensional U(1)--Higgs model
  We study the continuum limit of the $2D$ U(1)--Higgs model with variable scalar field length, which is qualitatively different from the fixed length case. Our simulations concentrate on the scaling behaviour of the topological susceptibility, and an instanton-induced confinement mechanism of fractional charges is numerically confirmed. 
Hermann Dilger and Jochen Heitger (Universit\"at M\"unster)