The Quantum Affine Origin of the AdS/CFT Secret Symmetry
  We find a new quantum affine symmetry of the S-matrix of the one-dimensional Hubbard chain. We show that this symmetry originates from the quantum affine superalgebra U_q(gl(2|2)), and in the rational limit exactly reproduces the secret symmetry of the AdS/CFT worldsheet S-matrix. 
Marius de Leeuw, Vidas Regelskis, Alessandro Torrielli
hep-th math-ph math.MP math.QA