  Renormalization group transformations as discussed recently in deriving fixed
point actions are used to analyse the vacuum structure near to the
deconfinement temperature. Monte Carlo configurations are generated using the
fixed point action. We compare equilibrium configurations with configurations
obtained by inverse blocking from a coarser lattice. The absence of short range
vacuum fluctuations in the latter does not influence the string tension. For
the inversely blocked configurations we find the following: (i) the topological
susceptibility chi_top is consistent with the phenomenological value in the
confinement phase, (ii) chi_top drops across the deconfinement transition,
(iii) density and size of instantons are estimated, (iv) the topological
density is found to be correlated to Abelian monopole currents and (v) the
density of spacelike monopole currents becomes a confinement order parameter.

High Energy Physics - Lattice