# Iwasawa theory of elliptic curves at Eisenstein primes and applications

*Francesc Castella (UC Santa Barbara)*

**20-Oct-2020, 20:30-21:30 (4 years ago)**

**Abstract: **In the study of Iwasawa theory of elliptic curves $E/\mathbb{Q}$, it is often assumed that $p$ is a non-Eisenstein prime, meaning that $E[p]$ is irreducible as a $G_{\mathbb{Q}}$-module. Because of this, most of the recent results on the $p$-converse to the theorem of Gross–Zagier and Kolyvagin (following Skinner and Wei Zhang) and on the $p$-part of the Birch–Swinnerton-Dyer formula in analytic rank 1 (following Jetchev–Skinner–Wan) were only known for non-Eisenstein primes $p$. In this talk, I’ll explain some of the ingredients in a joint work with Giada Grossi, Jaehoon Lee, and Christopher Skinner in which we study the (anticyclotomic) Iwasawa theory of elliptic curves over $\mathbb{Q}$ at Eisenstein primes. As a consequence of our study, we obtain an extension of the aforementioned results to the Eisenstein case. In particular, for $p=3$ this leads to an improvement on the best known results towards Goldfeld’s conjecture in the case of elliptic curves over $\mathbb{Q}$ with a rational $3$-isogeny.

algebraic geometrynumber theory

Audience: researchers in the topic

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Organizers: | Edgar Costa*, Bjorn Poonen*, David Roe*, Andrew Sutherland*, Robin Zhang*, Wei Zhang*, Thomas Rüd, Eran Assaf |

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