Holography for non-critical superstrings

We argue that a class of "non-critical superstring" vacua is holographically related to the (non-gravitational) theory obtained by studying string theory on a singular Calabi-Yau manifold in the decoupling limit g_s → 0. In two dimensions, adding fundamental strings at the singularity of the CY manifold leads to conformai field theories dual to a recently constructed class of AdS₃ vacua. In four dimensions, special cases of the construction correspond to the theory on an TVS'o-brane wrapped around a Riemann surface.