Discrete Hirota dynamics for AdS/CFT

Recently a set of functional equations defining the anomalous dimensions of arbitrary local single trace operators in planar N=4 supersymmetric Yang-Mills theory has been conjectured. These functional equations take the form of a Y-system defined on a special shaped domain. This Y-system can be equivalently reformulated as a T-system defined on a “T-shaped fat-hook”. The elements of the T-system satisfy discrete Hirota equations. In the present paper the discrete Hirota equations for AdS/CFT are solved by means of a chain of Bäcklund transformations and as a result TT-, TQ-, and QQ-relations are obtained for AdS/CFT.