Geometric P=W conjecture for Lagrangian tori

Let \mathcal{X}\xymatrix@1@=15pt{\ar[r]&}\Delta be a projective minimal divisorial log terminal type III degeneration of hyperkähler manifolds, let Xt\mathcal{X}_t be a smooth fiber, and let TXt\mathbb{T}\subset\mathcal{X}_t be a profound torus. Let f\colon X\xymatrix@1@=15pt{\ar[r]&} B be a Lagrangian fibration with general fiber TT. Geometric P=W conjecture. For every such fibration, there exists a degeneration \pi\colon\mathcal{X}\xymatrix@1@=15pt{\ar[r]&}\Delta with Xt\mathcal{X}_t deformation equivalent to XX for all tΔt\in\Delta^* such that TT is isotopic to a profound torus T\mathbb{T}.

TisotopicT.T\simeq_{\mathrm{isotopic}}\mathbb{T}.

This conjecture proposes a geometric explanation for the equality between perverse and weight Hodge numbers. The required degeneration and isotopy are not established in general.

Sources & referencesView supporting material

Primary source

Daniel Huybrechts and Mirko Mauri, “Lagrangian fibrations”, arXiv:2108.10193 (2022).

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