World Sheet Logarithmic CFT in AdS Strings, Ghost-Matter Mixing and M-theory

Abstract

We discuss several closely related concepts in the NSR formulation of superstring theory. We demonstrated that recently proposed NSR model for superstrings on $Ad{S}_5\times S^5$ is described by the world-sheet logarithmic conformal field theory (LCFT). The origin of LCFT on a world-sheet is closely connected to the matter-ghost mixing in the structure of a brane-like vortex operators. We suggest a dynamical origin of M theory as a string theory with an extra dimension given by bosonised superconformal ghosts.

20 pages, no figures, harvmac, corrected some typos

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