Preprint 2014-33
Olof Ohlsson Sax, Alessandro Sfondrini and Bogdan Stefanski
Integrability and the Conformal Field Theory of the Higgs branch.
Abstract: In the context of the AdS3/CFT2 correspondence, we investigate the CFT2 at the origin of the Higgs branch. This theory has a planar, weak-coupling limit, in which anomalous dimensions of single-trace composite operators can be calculated. At one loop, the calculation reduces to finding the spectrum of a spin-chain with nearest-neighbour interactions. This CFT2 spin-chain matches precisely the one that was previously found as the weak-coupling limit of the integrable system describing the AdS3 side of the duality. We compute the one-loop dilatation operator in a non-trivial compact subsector and show that it corresponds to an integrable spin-chain Hamiltonian. This provides the first direct evidence of integrability on the CFT2 side of the correspondence.
Preprint series: Institut für Mathematik, Humboldt-Universität zu Berlin (ISSN 0863-0976), 2014-33
26pp.