Geodesic
THE KATZ–KLEMM–VAFA CONJECTURE FOR $K3$ SURFACES
Forum of Mathematics, Pi, Tome 4 (2016)

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We prove the KKV conjecture expressing Gromov–Witten invariants of $K3$ surfaces in terms of modular forms. Our results apply in every genus and for every curve class. The proof uses the Gromov–Witten/Pairs correspondence for $K3$ -fibered hypersurfaces of dimension 3 to reduce the KKV conjecture to statements about stable pairs on (thickenings of) $K3$ surfaces. Using degeneration arguments and new multiple cover results for stable pairs, we reduce the KKV conjecture further to the known primitive cases. Our results yield a new proof of the full Yau–Zaslow formula, establish new Gromov–Witten multiple cover formulas, and express the fiberwise Gromov–Witten partition functions of $K3$ -fibered 3-folds in terms of explicit modular forms. 
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R. PANDHARIPANDE; R. P. THOMAS. THE KATZ–KLEMM–VAFA CONJECTURE FOR $K3$ SURFACES. Forum of Mathematics, Pi, Tome 4 (2016). doi: 10.1017/fmp.2016.2

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