Relative Gromov-Witten invariants and the mirror formula

Details Relative Gromov-Witten invariants and the mirror formula Relative Gromov-Witten invariants and the mirror formula

2000-09-20

arxiv.org/abs/math/0009190v1

Mathematics

Algebraic Geometry

16 pages

Scientific paper

Let X be a smooth complex projective variety, and let Y in X be a smooth very ample hypersurface such that -K_Y is nef. Using the technique of relative Gromov-Witten invariants, we give a new short and geometric proof of (a version of) the "mirror formula", i.e. we show that the generating function of the genus zero 1-point Gromov-Witten invariants of Y can be obtained from that of X by a certain change of variables (the so-called "mirror transformation"). Moreover, we use the same techniques to give a similar expression for the (virtual) numbers of degree-d plane rational curves meeting a smooth cubic at one point with multiplicity 3d, which play a role in local mirror symmetry.

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