2016/05/02 by Riccardo Borsato, Olof Ohlsson Sax, Alessandro Sfondrini +2 · 32 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Coupling (piping) #Degeneracy (biology) #Gapless playback #Integrable system #Massless particle #Physics of Superconductivity and Magnetism #Spectrum (functional analysis) #Spin (aerodynamics) #Supergravity #Topological Materials and Phenomena #hep-th
paper · pdf · doi:10.1088/1751-8113/49/41/41lt03
published in Journal of Physics A Mathematical and Theoretical 49(41), 41LT03 (Institute of Physics) · 6 pages, 4 figures
arxiv created 2016/05/02 · openalex publication_date 2016/09/23 · arxiv updated 2016/10/12 · openalex created_date 2019/06/27 · openalex updated_date 2026/08/05
We analyze the spectrum of perturbative closed strings on AdS 3 × S 3 × T 4 with Ramond–Ramond flux using integrable methods. By solving the crossing equations we determine the massless and mixed-mass dressing factors of the worldsheet S matrix and derive the Bethe equations. Using these, we construct the underlying integrable spin chain and show that it reproduces the reducible spin chain conjectured at weak coupling in Olof Ohlsson S, Bogdan S Jr and Torrielli A 2013 (arXiv: 1211.1952 ). We find that the string-theory massless modes are described by gapless excitations of the spin chain. The resulting degeneracy of vacua matches precisely the protected supergravity spectrum found by de Boer.