Status  Confirmed 
Seminar Series  RENCTHEO 
Subjects  hepth 
Date  Thursday 20 December 2018 
Time  10:00 
Institute  IHP 
Seminar Room  201 
Speaker's Last Name  Gaberdiel 
Speaker's First Name  Matthias 
Speaker's Email Address  
Speaker's Institution  ETH Zuerich 
Title  The worldsheet dual of the symmetric orbifold CFT 
Abstract  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. 
arXiv Preprint Number  
Comments  [based on joint work with Lorenz Eberhardt and Rajesh Gopakumar] 
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