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A_{n-1} singularities and nKdV hierarchies

Abstract

According to a conjecture of E. Witten proved by M. Kontsevich, a certain generating function for intersection indices on the Deligne -- Mumford moduli spaces of Riemann surfaces coincides with a certain tau-function of the KdV hierarchy. The generating function is naturally generalized under the name the {\em total descendent potential} in the theory of Gromov -- Witten invariants of symplectic manifolds. The papers arXiv: math.AG/0108100 and arXive: math.DG/0108160 contain two equivalent constructions, motivated by some results in Gromov -- Witten theory, which associate a total descendent potential to any semisimple Frobenius structure. In this paper, we prove that in the case of K.Saito's Frobenius structure on the miniversal deformation of the Anβˆ’1A_{n-1}-singularity, the total descendent potential is a tau-function of the nnKdV hierarchy. We derive this result from a more general construction for solutions of the nnKdV hierarchy from nβˆ’1n-1 solutions of the KdV hierarchy.Comment: 29 pages, to appear in Moscow Mathematical Journa

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