2010/12/31 by Matthias Staudacher
Physics and Astronomy · #hep-th #msc:82B23 #msc:16T25
paper · pdf · doi:10.1007/s11005-011-0530-9
17 pages, see also overview article arXiv:1012.3982, v2: references to other chapters updated, v3: minor corrections, final version
arxiv created 2011/11/24 · arxiv updated 2015/05/20
The one-dimensional Heisenberg XXX spin chain appears in a special limit of the AdS/CFT integrable system. We review various ways of proving its integrability, and discuss the associated methods of solution. In particular, we outline the coordinate and the algebraic Bethe ansatz, giving reference to literature suitable for learning these techniques. Finally we speculate which of the methods might lift to the exact solution of the AdS/CFT system, and sketch a promising method for constructing the Baxter Q-operator of the XXX chain. It allows to find the spectrum of the model using certain algebraic techniques, while entirely avoiding Bethe's ansatz.