Statut  Confirmé 
Série  RENCTHEO 
Domaines  hepth 
Date  Jeudi 20 Décembre 2018 
Heure  10:00 
Institut  IHP 
Salle  201 
Nom de l'orateur  Gaberdiel 
Prenom de l'orateur  Matthias 
Addresse email de l'orateur  
Institution de l'orateur  ETH Zuerich 
Titre  The worldsheet dual of the symmetric orbifold CFT 
Résumé  Superstring theory on AdS3×S3×T4 with the smallest amount of NSNS flux (k = 1) is shown to be dual to the spacetime CFT given by the large N limit of the free symmetric product orbifold Sym_N (T4). To define the worldsheet theory at k = 1, we employ the hybrid formalism in which the AdS3×S3 part is described by the psu(1, 12)_1 WZW model (which is well defined). Unlike the case for k ≥ 2, it turns out that the string spectrum at k = 1 does not exhibit the long string continuum, and perfectly matches with the large N limit of the symmetric product. We also demonstrate that the fusion rules of the symmetric orbifold are reproduced from the worldsheet perspective. Our proposal therefore affords a tractable worldsheet description of a tensionless limit in string theory, for which the dual CFT is also explicitly known. 
Numéro de preprint arXiv  
Commentaires  [based on joint work with Lorenz Eberhardt and Rajesh Gopakumar] 
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