Uniform equivalence conjecture for compatible Calabi–Yau metrics

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Let XX be a normal affine variety, let vv be a fixed polystable negative valuation on XX, and let Mv\mathcal M_v be the space of compatible Calabi–Yau metrics ω\omega on XX satisfying v=vωv=v_\omega. Uniform equivalence conjecture. If Mv\mathcal M_v is nonempty, then there exists a constant C>0C>0 such that for all ω1,ω2∈Mv\omega_1,\omega_2\in\mathcal M_v,

C−1ω1⩽ω2⩽Cω1.C^{-1}\omega_1\leqslant\omega_2\leqslant C\omega_1.

Uniform equivalence is necessary for two compatible Calabi–Yau metrics to have the same valuation, and the analogous local question for Kähler–Einstein metrics on varieties with klt singularities is also open. The conjecture itself remains open.

References

Primary source

Song Sun and Junsheng Zhang, “No semistability at infinity for Calabi-Yau metrics asymptotic to cones”, arXiv:2208.05098 (2023).

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