The conjecture on strongly topologically nilpotent crystals from rigid analytic geometry

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

f:R→K+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 a∈K×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.

References

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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