Loop observables for BF theories in any dimension and the cohomology of   knots
  A generalization of Wilson loop observables for BF theories in any dimension is introduced in the Batalin-Vilkovisky framework. The expectation values of these observables are cohomology classes of the space of imbeddings of a circle. One of the resulting theories discussed in the paper has only trivalent interactions and, irrespective of the actual dimension, looks like a 3-dimensional Chern-Simons theory. 
Alberto S. Cattaneo, Paolo Cotta-Ramusino, Carlo A. Rossi