Rationally connected $3$-folds and symplectic geometry
Résumé
We study the following question, asked to us By Pandharipande and Starr: Let $X$ be a rationally connected $3$-fold, and $Y$ be a compact Kaehler $3$-fold symplectically equivalent to it. Is $Y$ rationally connected? We show that the answer is positive if $X$ is Fano or $b_2(X)\leq2$. We also show that if a conjecture of Ruan on the invariance of Gromov-Witten invariants under blow-ups is true, then the answer is always positive.
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