
IAS Physics Group Meeting
On Type II String Theory on AdS3 x S3 x T4 and Symmetric Orbifolds
Abstract: I will present some questions and answers regarding the duality between 1+1-dimensional superconformal field theory and type II string theory on AdS3×S3xT4.
For one unit of NS-NS 5-brane flux (Q5=1), this string theory has been suggested to be dual to a grand-canonical ensemble of T4N/SN free symmetric orbifold CFTs. We explain how the string genus expansion emerges to all orders for the free orbifold grand-canonical correlation functions.
We also discuss how the strong coupling limit of the NS-NS string theory arises (even at large N) in the free orbifold description, and argue why this limit does not have a weakly coupled R-R description.
The dual CFT includes (for all values of Q5) an extra T4 factor which decouples from perturbative string theory. We discuss the exactly-marginal deformations that relate the different values of Q5, including the precise JˉJ deformations mixing this extra T4 with the symmetric orbifold.