Solving the AdS/CFT Y-system

Abstract

Using integrability and analyticity properties of the AdS 5/CFT4 Y-system we reduce it to a finite set of nonlinear integral equations. The ℤ4 symmetry of the underlying coset sigma model, in its quantum version, allows for a deeper insight into the analyticity structure of the corresponding Y-functions and T-functions, as well as for their analyticity friendly parameterization in terms of Wronskian determinants of Q-functions. As a check for the new equations, we reproduce the numerical results for the Konishi operator previously obtained from the original infinite Y-system.