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arXiv 2202.02844math.NT
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实二次域的Greenberg猜想与分圆$\mathbb{Z}_2$ -扩张

Greenberg's conjecture for real quadratic fields and the cyclotomic $\mathbb{Z}_2$-extensions

Lorenzo Pagani

摘要:

设$\mathcal{A}_n$是实二次数域$F$的分圆$\mathbb{Z}_2$ -扩张的第$n$层的理想类群的$2$-部分. $\mathcal{A}_n$的基数与全群单位中分圆单位的指数有关。我们提出了一种方法来研究后者的指数。作为一个应用,我们证明了$\mathcal{A}_n$的序列对实域$F=\mathbb{Q}(\sqrt{f})$对任意整数$0<f<10000$是稳定的. Equilibrium Greenberg的猜想适用于这些领域。

英文摘要:

Let $\mathcal{A}_n$ be the $2$-part of the ideal class group of the $n$-th layer of the cyclotomic $\mathbb{Z}_2$-extension of a real quadratic number field $F$. The cardinality of $\mathcal{A}_n$ is related to the index of cyclotomic units in the full group of units. We present a method to study the latter index. As an application we show that the sequence of the $\mathcal{A}_n$'s stabilizes for the real fields $F=\mathbb{Q}(\sqrt{f})$ for any integer $0<f<10000$. Equivalently Greenberg's conjecture holds for those fields.

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