Conifold Gap Conjecture for local P2\mathbb{P}^2

Let g?g\text{?} Let tCFt_{\rm CF} be the local conifold coordinate and define the genus-gg conifold Gromov–Witten potential of KP2K_{\mathbb{P}^2} by

GWgCFGWgLRqLRqCF.\mathrm{GW}_g^{\rm CF} \coloneqq \mathrm{GW}_g^{\rm LR}\big|_{\mathsf{q}_{\rm LR} \to \mathsf{q}_{\rm CF}}.

Here BnB_n denotes the nthn^{\rm th} Bernoulli number, defined by

tet1n0Bntnn!.\frac{t}{\mathrm{e}^{t}-1} \coloneqq \sum_{n \geq 0} \frac{B_n t^n}{n!}.

Conifold Gap property for KP2K_{\mathbb{P}^2}. For gZ2g \in \mathbb{Z}_{\geq 2}, near tCF=0t_{\rm CF}=0,

GWgCF=3g1B2g2g(2g2)tCF22g+O(1).\mathrm{GW}_g^{\rm CF} = \frac{3^{g-1} B_{2g}}{2g(2g-2)} t_{\rm CF}^{2-2g} + \mathcal{O}(1).

This conjectural property predicts the complete polar part of the Laurent expansion at the conifold point and removes the remaining 2g12g-1-dimensional ambiguity in the higher-genus potential up to the additive constant map term. The supplied text does not establish whether the conjecture has been resolved.

Sources & referencesView supporting material

Primary source

Andrea Brini, “Conifold gap and all-genus mirror symmetry for local P^2”, arXiv:2509.19298 (2025).

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