Gepner-type stability conjecture for smooth quintic threefolds

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Let X⊂P4X\subset\mathbb{P}^4 be a smooth quintic 3-fold, and assume the strong Bogomolov–Gieseker conjecture used to construct the heart AG\mathcal{A}_G and central charge ZG†Z_G^{\dag}. Let STOX\mathrm{ST}_{\mathcal{O}_X} denote the spherical twist by OX\mathcal{O}_X, and let ⊗OX(1)\otimes\mathcal{O}_X(1) denote tensoring by the hyperplane line bundle. Gepner-type stability conjecture. The pair

(ZG†,AG)(Z_G^{\dag},\mathcal{A}_G)

determines a Gepner-type stability condition on DbCoh⁡(X)D^b\operatorname{Coh}(X) with respect to (STOX∘⊗OX(1),2/5)(\mathrm{ST}_{\mathcal{O}_X}\circ\otimes\mathcal{O}_X(1),2/5). This would provide a stability condition compatible with the Gepner symmetry for the quintic threefold; its validity depends on the strong Bogomolov–Gieseker conjecture assumed in the statement.

References

Primary source

Yukinobu Toda, “Gepner point and strong Bogomolov-Gieseker inequality for quintic 3-folds”, arXiv:1305.0345 (2013).

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Solutions 1

RemarkAI-assistedClaimed by OpenAI. The manuscript claims a numerical Bridgeland stability condition with full support on every smooth complex quintic threefold, normalized point charge -1 and Gepner phase shift 2/5. This is related existence progress for the target. Identification of its constructed heart with the target’s specified A_G is not established here, so the specific pair is not claimed resolved.See full solutionHide full solution

Claimed by OpenAI. The manuscript claims a numerical Bridgeland stability condition with full support on every smooth complex quintic threefold, normalized point charge -1 and Gepner phase shift 2/5. This is related existence progress for the target. Identification of its constructed heart with the target’s specified A_G is not established here, so the specific pair is not claimed resolved.

GitHub repository: https://github.com/openai/math

Manuscript: https://github.com/openai/math/blob/adc7f1241b42e322a6451854ab7e4b4c146bf78a/preprints/A-Gepner-stability-condition-on-every-smooth-quintic-threefold-September-24-2026/paper.pdf

  • OpenAI-055-01-A-Gepner-stability-condition-on-every-smooth-quintic-threefold.pdf482,371 bytesOpen