On L-infinity morphisms of cyclic chains
  Recently the first two authors constructed an L-infinity morphism using the S^1-equivariant version of the Poisson Sigma Model (PSM). Its role in deformation quantization was not entirely clear. We give here a "good" interpretation and show that the resulting formality statement is equivalent to formality on cyclic chains as conjectured by Tsygan and proved recently by several authors. 
Alberto S. Cattaneo (1), Giovanni Felder (2), Thomas Willwacher (2)   ((1) University of Zurich, (2) ETH Zurich)