The NBI matrix model of IIB Superstrings

We investigate the NBI matrix model with the potential $XΛ+X^{-1}+(2η+1)\log X$ recently proposed to describe IIB superstrings. With the proper normalization, using Virasoro constraints, we prove the equivalence of this model and the Kontsevich matrix model for $η\ne0$ and find the explicit transformation between the two models.

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