4d ensembles of percolating center vortices and chains

In this work, we review a recently proposed measure to compute center-element averages in a mixed ensemble of center vortices and chains with non-Abelian d.o.f. and monopole fusion. When center vortices percolate and monopoles condense, the average is captured by a saddle point and collective modes in a YMH model. In this manner, the Luscher term, confining flux tubes with N-ality and confined gluons were accommodated in an ensemble picture.