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Ofer Aharony : `Little String Theories of NS 5-Branes and Holography in Linear Dilaton Backgrounds

We argue that vacua of string theory which asymptote at weak coupling to linear dilaton backgrounds are holographic (like AdS backgrounds). The full string theory in such vacua is ``dual'' to a theory without gravity in fewer dimensions. The dual theory is generically not a local quantum field theory. Excitations of the string vacuum, which can be studied in the weak coupling region using worldsheet methods, give rise to observables in the dual theory. An interesting example is string theory in the near-horizon background of parallel NS5-branes, the CHS model, which is dual to the decoupled NS5-brane theory (``little string theory''). This duality can be used to study some of the observables in this theory and some of their correlation functions.

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