The conjecture on strongly topologically nilpotent crystals from rigid analytic geometry

Let RR be a topologically finitely generated and pp-complete OC{\mathcal{O}}_{\mathbf{C}}-algebra, and let

f:RK+f:R\to \mathcal{K}^+

be an OC{\mathcal{O}}_{\mathbf C}-homomorphism. A rational Hodge--Tate crystal on (R/A)\mathbbbΔ(R/A)_{\mathbbb{\Delta}} is a crystal with rational Hodge--Tate structure, and its base change to K+\mathcal{K}^+ is said to be aa-small when it belongs to the corresponding category of aa-small crystals. The strongly topologically nilpotent crystal conjecture. For any rational Hodge--Tate crystal E\mathcal{E} on (R/A)\mathbbbΔ(R/A)_{\mathbbb{\Delta}}, the base change of E\mathcal{E} to K+\mathcal{K}^+ is aa-small for some topologically nilpotent aK×a\in \mathcal{K}^\times. This predicts that all crystals arising from rigid analytic geometry lie in the strongly topologically nilpotent class, extending the preceding classification of such crystals by generalized representations.

Sources & referencesView supporting material

Primary source

Xiaoyu Qu and Jiahong Yu, “Rational Hodge–Tate prismatic crystals of quasi-l.c.i algebras and non-abelian p-adic Hodge theory”, arXiv:2511.03458 (2026).

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