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The tropical vertex

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arxiv 0902.0779 v2 pith:REJUDPDA submitted 2009-02-04 math.AG math.SG

The tropical vertex

classification math.AG math.SG
keywords tropicalvertexcalculationsgromov-wittengroupinvariantsrelativetoric
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Elements of the tropical vertex group, introduced by Kontsevich and Soibelman, are formal families of symplectomorphisms of the 2-dimensional algebraic torus. We prove ordered product factorizations in the tropical vertex group are equivalent to calculations of certain genus 0 relative Gromov-Witten invariants of toric surfaces. The relative invariants which arise have full tangency to a toric divisor at a single unspecified point. The method uses scattering diagrams, tropical curve counts, degeneration formulas, and exact multiple cover calculations in orbifold Gromov-Witten theory.

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