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1 LPTENS - Laboratoire de Physique Théorique de l-ENS 2 CPHT - Centre de Physique Théorique Palaiseau

Abstract : We study a non-standard decoupling limit of the D1-D5-branesystem, which interpolates between the near-horizon geometry ofthe D1-D5 background and the near-horizon limit of the pureD5-brane geometry. The S-dual description of this background isactually an exactly solvable two-dimensional worldsheetconformal field theory: {null-deformed SL2,R} xSU2 x T^4 or K3. This model is free of strong-couplingsingularities. By a careful treatment of the SL2,R,based on the better-understood SL2,R - U1 coset, weobtain the full partition function for superstrings onSL2,R x SU2 x K3. Thisallows us to compute the partition functions for the J^3and J^2 current-current deformations, as well as the fullline of supersymmetric null deformations, which links theSL2,R conformal field theory with linear dilatontheory. The holographic interpretation of this setup is arenormalization-group flow between the decoupled NS5-braneworld-volume theory in the ultraviolet Little String Theory, andthe low-energy dynamics of super Yang-Mills string-likeinstantons in six dimensions.

Keywords : Little String Theory Superstrings backgrounds Branes CFT AdS3

Author: Dan Israel - Costas Kounnas - Marios Petropoulos -



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