Mirror symmetry for P^2 and tropical geometry

Details Mirror symmetry for P^2 and tropical geometry Mirror symmetry for P^2 and tropical geometry

2009-03-08

arxiv.org/abs/0903.1378v2

Mathematics

Algebraic Geometry

79 pages, New version has significantly improved exposition of proofs and many typoes corrected

Scientific paper

This paper explores the relationship between mirror symmetry for P^2, at the level of big quantum cohomology, and tropical geometry. The mirror of P^2 is typically taken to be ((C^*)^2,W), where W is a Landau-Ginzburg potential of the form x+y+1/xy. The complex moduli space of the mirror is the universal unfolding of W, and oscillatory integrals produce a Frobenius manifold structure on this universal unfolding. We show that W can be deformed by counting Maslov index two tropical disks, and the natural paramaters appearing in this deformation are then the flat coordinates on the moduli space. Furthermore, the oscillatory integrals are shown to read off directly tropical curve counts from the potential. Thus we show in fact that mirror symmetry for P^2 is equivalent in a strong sense to tropical curve counting formulas, including tropical formulas for gravitational descendent invariants.

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