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arXiv 2610.12759math.NT
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刚性解析曲线可以具有稠密的p进轨道

A Rigid Analytic Curve Can Have a Dense $p$-adic Orbit

Yu Fu

AI总结:

该数学研究证明刚性解析曲线可具有稠密p进轨道,构造了满足特定轨道性质的解析映射与曲线,完善了p进解析空间轨道相关的理论结论。

摘要:

设$\boldsymbol{\textit{D}}$是Drinfeld上半空间的乘积,$\boldsymbol{\textit{J}}$是作用在$\boldsymbol{\textit{D}}$上对应的射影线性群乘积。我们证明:若$\boldsymbol{\textit{Y}}$是约化、拟紧、分离的严格$\boldsymbol{\textit{C}}_p$-解析空间,且$\boldsymbol{\textit{f}: Y\to\boldsymbol{\textit{D}}}$是解析映射,满足$\boldsymbol{\textit{dim }Y<dim\boldsymbol{\textit{D}}}$,则$\boldsymbol{\textit{J}f(Y(\boldsymbol{\textit{C}}_p))}$在$\boldsymbol{\textit{D}(\boldsymbol{\textit{C}}_p)}$中是闭的且无处稠密。即使源是严格刚性解析曲线,拟紧性假设仍是必要的;而拟紧的完美源仍可具有带非空内部的轨道闭包。对每个有限扩张$\boldsymbol{\textit{F}/\boldsymbol{\textit{Q}}_p}$和$\boldsymbol{\textit{d}\boldsymbol{\textit{\textgreater{}}}\boldsymbol{\textit{3}}}$,我们在$\boldsymbol{\textit{\textOmega}_F^{d-1}}$中构造一条闭、光滑、不可约、非拟紧的曲线,其在固定对角单参数子群作用下具有稠密轨道。我们还构造了从开单位圆盘到$\boldsymbol{\textit{P}}^2$的$\boldsymbol{\textit{Q}}_p$-定义解析映射,其$\boldsymbol{\textit{PGL}_3(\boldsymbol{\textit{Q}}_p)}$轨道稠密;以及从一维仿环完美环面到$\boldsymbol{\textit{P}}^2$的解析映射,其$\boldsymbol{\textit{PGL}_3(\boldsymbol{\textit{Q}}_p)}$轨道闭包具有非空内部。

英文摘要:

Let $\mathcal D$ be a product of Drinfeld upper half spaces and let $J$ be the corresponding product of projective linear groups acting on $\mathcal D$. We prove that if $Y$ is a reduced, quasi-compact separated strict $\mathbb C_p$-analytic space and $f: Y\to\mathcal D$ is analytic with $\dim Y<\dim\mathcal D$, then $J f(Y(\mathbb C_p))$ is closed and nowhere dense in $\mathcal D(\mathbb C_p)$. The quasi-compactness assumption is necessary even when the source is a strict rigid analytic curve, while a quasi-compact perfectoid source can still have an orbit closure with nonempty interior. For every finite extension $F/\mathbb Q_p$ and $d\geq3$, we construct a closed smooth irreducible non-quasi-compact curve in $Ω_F^{d-1}$ with dense orbit under a fixed diagonal one-parameter subgroup. We also construct a $\mathbb Q_p$-defined analytic map from the open unit disc to $\mathbf P^2$ with dense $\operatorname{PGL}_3(\mathbb Q_p)$-orbit, and an analytic map from a one-dimensional affinoid perfectoid torus to $\mathbf P^2$ whose $\operatorname{PGL}_3(\mathbb Q_p)$-orbit closure has nonempty interior.

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