Maulik–Yun's perverse–Lefschetz opposition conjecture for compactified Jacobians

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Let CC be an integral curve with planar singularities, let J=JC0J=J_C^0 be its compactified Jacobian, and let P≤iP_{\leq i} be the perverse filtration on H∗(J)H^*(J) defined via a suitable family of relative compactified Jacobians J→B\mathcal{J}\to B. Let W≤iW_{\leq i} denote the Lefschetz filtration on H∗(J)H^*(J).

Maulik–Yun's conjecture. The perverse filtration and the Lefschetz filtration are opposite:

P≤i is opposite to W≤i.P_{\leq i}\text{ is opposite to }W_{\leq i}.

This conjecture predicts a precise relationship between the perverse filtration arising from a deformation family and the intrinsic Lefschetz filtration on the cohomology of a compactified Jacobian. The source attributes it to Maulik and Yun; its status is not determined by the supplied text.

References

Primary source

Yao Yuan, “Lefschetz filtration and Perverse filtration on the compactified Jacobian”, arXiv:2603.07193 (2026).

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