Borisov–Oblomkov–Pandharipande–Yin conjecture for Donaldson–Thomas invariants of abelian threefolds

Let (A,H)(A,H) be a principally polarized abelian threefold with Picard rank ρ(A)=1\rho(A)=1. For nonzero (β,n)Z2(\beta,n)\in\mathbb{Z}^2, define DTβ,n=DTH(1,0,β,n)\operatorname{DT}_{\beta,n}=\operatorname{DT}_H(1,0,-\beta,-n), and let a(n)\mathsf{a}(n) and n(β,k)\mathsf{n}(\beta,k) be defined by the Fourier expansion and divisor sum described in the setup. Borisov–Oblomkov–Pandharipande–Yin conjecture. Assuming β>0\beta>0, or β=0\beta=0 and n>0n>0, one has

DTβ,n=(1)nk1kn1kn(β,k)a(4β3n2k2).\operatorname{DT}_{\beta,n}=(-1)^n\sum_{\substack{k\geq 1\\ k\mid n}}\frac{1}{k}\mathsf{n}(\beta,k)\mathsf{a}\left(\frac{4\beta^3-n^2}{k^2}\right).

This conjectural formula gives the predicted curve-counting invariants for principally polarized abelian threefolds of Picard rank one; the source presents it as a conjecture proposed in the cited work, with no resolution supplied here.

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Primary source

Georg Oberdieck, Dulip Piyaratne and Yukinobu Toda, “Donaldson-Thomas invariants of abelian threefolds and Bridgeland stability conditions”, arXiv:1808.02735 (2020).

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