Hilbert-scheme degeneration conjecture for quartic double solids

Let YP3Y\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 \bvK0num(\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 bob\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.

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Primary source

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

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