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Hodge integrals and Gromov-Witten theory

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arxiv math/9810173 v1 pith:P2FYKKX3 submitted 1998-10-30 math.AG hep-th

C. Faber , R. Pandharipande This is my paper · ORCID
classification math.AGhep-th
keywords gromov-wittenhodgeintegralsgenustheoryappliedcalculationsdegree
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Integrals of the Chern classes of the Hodge bundle in Gromov-Witten theory are studied. We find a universal system of differential equations which determines the generating function of these integrals from the standard descendent potential (for any target X). We use virtual localization and classical degeneracy calculations to find trigonometric closed form solutions for special Hodge integrals over the moduli space of pointed curves. These formulas are applied to two computations in Gromov-Witten theory for Calabi-Yau 3-folds. The genus g, degree d multiple cover contribution of a rational curve is found to be simply proportional to the Euler characteristic of M_g. The genus g, degree 0 Gromov-Witten invariant is calculated (in agreement with recent string theoretic calculations of Gopakumar-Vafa and Marino-Moore). Finally, with Zagier's help, our Hodge integral formulas imply a general genus prediction of the punctual Virasoro constraints applied to the projective line.

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