String and dilaton equations for counting lattice points in the moduli space of curves

Details String and dilaton equations for counting lattice points in the moduli space of curves String and dilaton equations for counting lattice points in the moduli space of curves

2009-05-26

arxiv.org/abs/0905.4141v2

Mathematics

Algebraic Geometry

23 pages

Scientific paper

We prove that the Eynard-Orantin symplectic invariants of the curve xy-y^2=1 are the orbifold Euler characteristics of the moduli spaces of genus g curves. We do this by associating to the Eynard-Orantin invariants of xy-y^2=1 a problem of enumerating covers of the two-sphere branched over three points. This viewpoint produces new recursion relations---string and dilaton equations---between the quasi-polynomials that enumerate such covers.

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