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On the $\mu$-invariant of two-variable $2$-adic $\boldsymbol{L}$-functions

Part of: Discontinuous groups and automorphic forms Arithmetic algebraic geometry Algebraic number theory: global fields Algebraic number theory: local and $p$-adic fields

Published online by Cambridge University Press:  24 February 2025

Yong-Xiong Li Open the ORCID record for Yong-Xiong Li [Opens in a new window]
Yong-Xiong Li*
Affiliation:
Yanqi Lake Beijing Institute of Mathematical Sciences and Applications, Beijing, China
*
Email: yongxiongli@gmail.com
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Abstract

Let $K={\mathbb {Q}}(\sqrt {-7})$ and $\mathcal {O}$ the ring of integers in $K$. The prime $2$ splits in $K$, say $2{\mathcal {O}}={\mathfrak {p}}\cdot {\mathfrak {p}}^*$. Let $A$ be an elliptic curve defined over $K$ with complex multiplication by $\mathcal {O}$. Assume that $A$ has good ordinary reduction at both $\mathfrak {p}$ and ${\mathfrak {p}}^*$. Write $K_\infty$ for the field generated by the $2^\infty$–division points of $A$ over $K$ and let ${\mathcal {G}}={\mathrm {Gal}}(K_\infty /K)$. In this paper, by adopting a congruence formula of Yager and De Shalit, we construct the two-variable $2$-adic $L$-function on $\mathcal {G}$. Then by generalizing De Shalit’s local structure theorem to the two-variable setting, we prove a two-variable elliptic analogue of Iwasawa’s theorem on cyclotomic fields. As an application, we prove that every branch of the two-variable measure has Iwasawa $\mu$ invariant zero.

Keywords

Elliptic curvesIwasawa theoryμ-invariant

MSC classification

Primary: 11R23: Iwasawa theory
Secondary: 11G16: Elliptic and modular units 11F85: $p$-adic theory, local fields 11S80: Other analytic theory (analogues of beta and gamma functions, $p$-adic integration, etc.)

Information

Type
Research Article
Information
Glasgow Mathematical Journal , Volume 67 , Issue 3 , September 2025 , pp. 325 - 355
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Copyright
© The Author(s), 2025. Published by Cambridge University Press on behalf of Glasgow Mathematical Journal Trust

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