A Study of Fine Selmer Groups Over Function Fields via Greenberg Neighbourhoods

Abstract

Greenberg examined the local behaviour of Iwasawa invariants as functions on the set $\mathcal{E}(F)$, the set of all ${\mathbb{Z}}_p$-extensions of a number field $F$. Kleine later extended these ideas to study the variation of Iwasawa invariants in the context of Selmer groups of abelian varieties across different ${\mathbb{Z}}_p$-extensions of $F$. Let $K$ be a global function field of characteristic $p$. In this article, we examine the relationship between the Iwasawa invariants of fine Selmer groups of an elliptic curve over $K$ as one varies over different ${\mathbb{Z}}_p$-extensions of $K$, using the methods developed by Kleine. We also study generalised Iwasawa invariants of the fine Selmer groups over a ${\mathbb{Z}}_p^2$-extension $\mathcal{L}/K$, adapting the techniques used by Kleine, Matar and Sujatha.

arXiv commentAccepted for publication in the Journal of Pure and Applied Algebra