Open Gromov-Witten Theory and the Crepant Resolution Conjecture

Abstract: We compute open GW invariants for $\mathcal{K}{\mathbb{P}^1}\oplus\mathcal{O}{\mathbb{P}^1}$, open orbifold GW invariants for $[\C^3/\Z_2]$, formulate an open crepant resolution conjecture and verify it for this pair. We show that open invariants can be glued together to deduce the Bryan-Graber closed crepant resolution conjecture for the orbifold $[\mathcal{O}{\mathbb{P}^1}(-1)\oplus\mathcal{O}{\mathbb{P}^1}(-1)/\Z_2]$ and its crepant resolution $\mathcal{K}_{\mathbb{P}^1\times\mathbb{P}^1}$.