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arXiv 2406.03201math.NT
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函数域情形下精细塞尔默群的特征理想与同源下μ不变性的结果

Characteristic ideal of the fine Selmer group and results on $μ$-invariance under isogeny in the function field case

Sohan Ghosh, Jishnu Ray

AI总结:

该研究在函数域框架下推广了Lee关于阿贝尔簇Mordell-Weil群Λ-模结构的结果,计算了精细塞尔默群对偶的特征理想,证明了非交换扩张下椭圆曲线塞尔默群μ不变量的平凡性,并给出了同源下μ不变量的下界。

摘要:

考虑特征为p>0的函数域K。我们研究了K的ℤ_p-扩张上阿贝尔簇的Mordell-Weil群的Λ-模结构,推广了Lee的相关结果。接下来,我们研究了K的ℤ_p-扩张上S-精细Mordell-Weil群(即Wuthrich的精细Mordell-Weil群的函数域对应物)的代数结构,并证明了其控制定理。在非分歧ℤ_p-扩张K_∞的情形下,我们计算了S-精细Mordell群的Pontryagin对偶的特征理想,这为函数域框架下对偶精细塞尔默群特征理想的Greenberg问题的对应问题给出了答案。在ℓ≠p的情形下,我们证明了K的非交换GL₂(ℤ_ℓ)-扩张上椭圆曲线的塞尔默群(此情形下与精细塞尔默群一致)的μ不变量是平凡的,从而推广了猜想A。在ℓ=p的情形下,我们计算了同源下椭圆曲线的对偶塞尔默群的μ不变量的变化,给出了μ不变量的一个下界。

英文摘要:

Consider a function field $K$ with characteristic $p>0$. We investigate the $Λ$-module structure of the Mordell-Weil group of an abelian variety over $\mathbb{Z}_p$-extensions of $K$, generalizing results due to Lee. Next, we study the algebraic structure and prove a control theorem for the S-fine Mordell-Weil groups, the function field analogue for Wuthrich's fine Mordell-Weil groups, over a $\mathbb{Z}_p$-extension of $K$. In case of unramified $\mathbb{Z}_p$-extension, $K_\infty$, we compute the characteristic ideal of the Pontryagin dual of the S-fine Mordell group. This provides an answer to an analogue of Greenberg's question for the characteristic ideal of the dual fine Selmer group in the function field setup. In the $\ell\neq p$ case, we prove the triviality of the $μ$-invariant for the Selmer group (same as the fine Selmer group in this case) of an elliptic curve over a non-commutative $GL_2(\mathbb{Z}_\ell)$-extension of $K$ and thus extending Conjecture A. In the $\ell=p$ case, we compute the change of $μ$-invariants of the dual Selmer groups of elliptic curves under isogeny, giving a lower bound for the $μ$-invariant.

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