Secret Symmetries in AdS/CFT
  We discuss special quantum group (secret) symmetries of the integrable system associated to the AdS/CFT correspondence. These symmetries have by now been observed in a variety of forms, including the spectral problem, the boundary scattering problem, n-point amplitudes, the pure-spinor formulation and quantum affine deformations. 
Marius de Leeuw, Takuya Matsumoto, Sanefumi Moriyama, Vidas Regelskis   and Alessandro Torrielli
hep-th math-ph math.MP math.QA