$p$-adic $L$-functions for elliptic curves over global function fields

TL;DR

This paper constructs a $p$-adic $L$-function for ordinary elliptic curves over global function fields, demonstrating its properties and proving cases of the Iwasawa main conjecture relating it to Selmer groups.

Contribution

It introduces a new $p$-adic $L$-function for elliptic curves over function fields and establishes its key properties and connections to the Iwasawa main conjecture.

Findings

The $p$-adic $L$-function interpolates special values of twisted Hasse-Weil $L$-functions.

The $p$-adic $L$-function satisfies a functional equation and a specialization formula.

The Iwasawa main conjecture is proven in several cases, especially for $d eq 2$.

Abstract

We introduce a $p$-adic $L$-function $\mathscr L_{A/L}$ associated to an ordinary elliptic curve $A$ over a global function field $K$ of characteristic $p$ together with a $\mathbb{Z}_{p}^{d}$-extension $L/K$, $d=0$ allowed, unramified outside a finite set of places where $A$ has ordinary (good ordinary or multiplicative) reductions. This $\mathscr L_{A/L}$ is characterized by its interpolation of the special values of twisted Hasse-Weil $L$-functions, we show that it satisfies the desired functional equation and specialization formula in connection with the characteristic ideal of the dual $p^\infty$-Selmer group of $A/L$. The Iwasawa main conjecture having $\mathscr{L}_{A / L}$ as the analytic side is proven in several cases. In the $d\geq 3$ case, %and $A/K$ has semi-stable reductions everywhere, the conjecture holds for $A/L$ if and only if it holds for all intermediate $\Z_p^2$-extensions $A/L'$ belonging to a given non-empty Zariski open subset of the Grassmannian $\mathrm{Gr}(d-2,d)(\Z_p)$.