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# Advances in Theoretical and Mathematical Physics

## Volume 19 (2015)

### Number 5

### Spectral curves and the Schrödinger equations for the Eynard–Orantin recursion

Pages: 955 – 1015

DOI: http://dx.doi.org/10.4310/ATMP.2015.v19.n5.a2

#### Authors

#### Abstract

It is predicted that the principal specialization of the partition function of a B-model topological string theory, that is mirror dual to an A-model enumerative geometry problem, satisfies a Schrödinger equation, and that the characteristic variety of the Schrödinger operator gives the spectral curve of the B-model theory, when an algebraic $K$-theory obstruction vanishes. In this paper we present two concrete mathematical A-model examples whose mirror dual partners exhibit these predicted features on the B-model side. The A-model examples we discuss are the generalized Catalan numbers of an arbitrary genus and the single Hurwitz numbers. In each case, we show that the Laplace transform of the counting functions satisfies the Eynard–Orantin topological recursion, that the B-model partition function satisfies the KP equations, and that the principal specialization of the partition function satisfies a Schrödinger equation whose total symbol is exactly the Lagrangian immersion of the spectral curve of the Eynard–Orantin theory.