TOPOLOGY AT THE DECONFINEMENT TRANSITION UNCOVERED BY INVERSE BLOCKING IN SU(2) PURE GAUGE-THEORY WITH FIXED-POINT ACTION

Renormalization group transformations as discussed recently in derivin g fixed point actions are used to analyze the vacuum structure near th e deconfinement temperature. Monte Carlo configurations are generated using the fixed point action. We compare equilibrium configurations wi th 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 configuration s we find the following: (i) the topological susceptibility chi(top) i s consistent with the phenomenological value in the confinement phase, (ii) chi(top) drops across the deconfinement transition, (iii) densit y and size of instantons are estimated, (iv) the topological density i s found to be correlated to Abelian monopole currents and (v) the dens ity of spacelike monopole currents becomes a confinement order paramet er. (C) 1998 Elsevier Science B.V.