Crepant resolution conjecture for foldings of ADE resolutions

Let R\mathcal{R} be an ADE root system, let Rfold\mathcal{R}^{\mathrm{fold}} be its folding, and let XRfold\mathcal{X}_{\mathcal{R}^{\mathrm{fold}}} be the corresponding orbifold with crepant resolution ZRresZ_{\mathcal{R}^{\rm res}}. After analytic continuation and the affine change of variables defined by the affine identification Φ\Phi, the crepant resolution conjecture. There is an isomorphism

QHC×(ZRres)QHorb,C×(XRfold).\mathrm{QH}_{\mathbb{C}^\times}^*\bigl(Z_{\mathcal{R}^{\rm res}}\bigr)\cong \mathrm{QH}^*_{\mathrm{orb},\mathbb{C}^\times}\bigl(\mathcal{X}_{\mathcal{R}^{\mathrm{fold}}}\bigr).

This is the proposed comparison between the quantum cohomology of the crepant resolution and the orbifold quantum cohomology of the folded quotient stack; the paper presents supporting evidence, but does not establish the full isomorphism.

Sources & referencesView supporting material

Primary source

Jingxiang Ma, “On Orbifold Quantum Cohomology of Foldings of ADE Resolutions”, arXiv:2607.11766 (2026).

Additional references

7 papers in this index state this conjecture (2004–2026). The statement above is taken from the most recent of them; the others are arXiv:1906.07238, arXiv:1707.02910, arXiv:1202.2094, arXiv:1108.5944, arXiv:0710.5901, arXiv:math/0402043.

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