Hilbert-scheme degeneration conjecture for quartic double solids

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Let Y→P3Y\to\mathbb{P}^3 be a quartic double solid whose ramification divisor contains no lines, and let \cX/B\cX/B be the family of prime Fano threefolds of genus 66 constructed in Theorem 1.1. Hilbert-scheme degeneration conjecture. There exists a stability condition \upsigma‾\underline{\upsigma} on \bcA\cX\bcA_{\cX} and a section \bv∈K⁡0num(\bcA\cX/B)(B)\bv\in\operatorname{K}_0^{\mathrm{num}}(\bcA_{\cX}/B)(B) such that the associated moduli space \rM\upsigma‾(\bcA\cX,\bv)\rM_{\underline{\upsigma}}(\bcA_{\cX},\bv) is a smooth and proper family of surfaces \cF(\cX/B)\cF(\cX/B) with fibers \cF(\cX/B)b≅\rF2min(\cXb)\cF(\cX/B)_b\cong\rF^{\mathrm{min}}_2(\cX_b) for b≠ob\neq o and \cF(\cX/B)o≅\rF1(Y)\cF(\cX/B)_o\cong\rF_1(Y). This predicts a categorical interpolation between the minimal model of the Hilbert scheme of conics on the general Fano threefold and the Hilbert scheme of lines on the quartic double solid.

References

Primary source

Alexander Kuznetsov and Evgeny Shinder, “Derived categories of Fano threefolds and degenerations”, arXiv:2305.17213 (2024).

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