Triangle Seminars

Abstract:
In this talk I will present a short review on the algebraic Bethe ansatz technique and
on the recently found solution of the so-called inverse problem. I will show how this
solution provides a means for the explicit and exact computation of correlation
functions in spin chains and summarize some of the many results obtained in this
direction by members of the theory group at the ENS-Lyon in the last years.
Finally I will present some work still in progress which intends the generalization
of these techniques to the case of spin chains in the presence of impurities.

Abstract:
The recent discovery of supersymmetric black ring solutions has important implications for black hole uniqueness and other aspects of black hole physics in higher dimensions. The construction of these solutions is investigated, and a generalization of the single ring solution to a system of concentric (multi-charge) rings is presented. The entropy of some of these solutions is particularly interesting.

Abstract:
In the last year and a half, many new tests of the AdS/CFT correspondence have been achieved by studying a certain class of non-topological solitons corresponding to rotating strings which carry (at least) two large angular momenta. They are dual to CFT operators which are far away from the 1/2 BPS operators of Berenstein, Maldacena and Nastase. We will discuss to which point can these results test the AdS/CFT away from supersymmetry.