Master Symmetry for Holographic Wilson Loops
  We identify the symmetry underlying the recently observed spectral-parameter transformations of holographic Wilson loops alias minimal surfaces in AdS/CFT. The generator of this nonlocal symmetry is shown to furnish a raising operator on the classical Yangian-type charges of symmetric coset models. We explicitly demonstrate how this master symmetry acts on strong-coupling Wilson loops and indicate a possible extension to arbitrary coupling. 
Thomas Klose, Florian Loebbert, Hagen Munkler
hep-th math-ph math.MP nlin.SI