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arXiv 2602.20737math.NT
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关于具有双曲二重的模形式Hida家族的局部特征化

On local characterizations of Hida families of Siegel modular forms

Indian Institute of Science(印度科学学院)

Shaunak V. Deo, Bharathwaj Palvannan

AI总结:

本文通过局部特征化方法,研究了具有双曲二重的模形式Hida家族,并证明了相关Selmer群的伪零性及R=TT定理。

摘要:

我们提供了具有双曲二重的模形式Hida家族的新局部特征化,这些特征化类似于Ghate-Vatsal为CM模形式Hida家族所提供的特征化。我们的特征化涉及(i)在奇异权重(k,2)处p处de Rham的密度,以及(ii)关联的Λ-adic伽罗瓦表示在p处的局部分解性。我们的方法类似于Castella-Wang-Erickson所采用的方法,他们通过应用Ribet的方法,在假设反循环类群为伪零且作为Λ-模为循环时,提供了重新证明Ghate-Vatsal主要结果的替代策略。沿着这些思路,我们方法中的一个关键输入涉及对定义时在p处施加比通常出现在实二次域上的Asai主猜想中出现的Greenberg Selmer群所施加的更严格条件的Selmer群的伪零性假设。接着Genestier-Tilouine和Pilloni,我们还证明了一个最小的R=TT定理,这对于在各个阶段建立我们的结果至关重要。

英文摘要:

We provide new local characterizations of Hida families of Siegel modular forms with genus two arising from stable Yoshida lifts, that is, automorphic inductions of nearly ordinary Hilbert modular eigenforms over real quadratic fields. Our characterizations involve (i) density of de Rham at $p$ specializations at the singular weights $(k,2)$ and (ii) local decomposability at $p$ of the associated $Λ$-adic Galois representation. These are analogous to the characterizations of Hida families of CM modular forms provided by Ghate--Vatsal. Our approach is similar to that of Castella--Wang-Erickson who provided an alternate strategy to reproving Ghate--Vatsal's main results by applying Ribet's method when an anti-cyclotomic class group is assumed to be pseudo-null and cyclic as a $Λ$-module. Along these lines, one key input to our methods involves an assumption of pseudo-nullity of Selmer groups that are defined by imposing stricter conditions at $p$ than those imposed for the usual Greenberg Selmer groups appearing in the Asai main conjectures over real quadratic fields.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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