# Conference on Integrability in Gauge and String Theory 2010

June 28, 2010 to July 2, 2010
Nordita
Europe/Stockholm timezone

## TBA and functional relations for the AdS_5/CFT_4 correspondence

Jun 29, 2010, 2:30 PM
1h
Oskar Klein lecture hall (Nordita)

### Speaker

Roberto Tateo (universita` di Torino)

### Description

The exact anomalous dimensions of the single trace composite operators in the planar limit of $N=4$ super Yang-Mills can be studied in the framework of the Thermodynamic Bethe Ansatz method (TBA). In this talk, I will discuss the analytic properties of the TBA solutions -the Y-functions- and the associated set of functional relations -the Y-system-. Contrary to the more studied relativistic invariant cases, the $AdS_5/CFT_4$-related Y-functions live on multi-sheeted coverings of the complex plane with an infinite number of square-root branch points. As a direct consequence of this fact, the TBA equations and in particular the dressing kernel cannot be obtained from the Y-system without extra information on the square-root discontinuities across semi-infinite segments in the complex plane. It is shown that the discontinuity functions fulfill an independent simple set of local functional equations. The Y-system extended by the discontinuity relations forms a fundamental set of local non-linear constraints that can be easily transformed into integral form through Cauchy's theorem.

 Slides