On a conjecture of Darmon-Rotger in the adjoint CM case

Francesc Castella (University of California, Santa Barbara)

22-Apr-2021, 18:00-19:00 (3 years ago)

Abstract: Let $E$ be an elliptic curve over $\mathbf{Q}$, and suppose that $L(E,s)$ has sign $+1$ in its functional equation and vanishes at $s=1$. Let $p>3$ be a prime of good ordinary reduction for $E$. A construction of Darmon-Rotger attaches to $E$ and an auxiliary weight one cuspidal eigenform $g$ a Selmer class $\kappa_p(E,g,g^*)\in\mathrm{Sel}(\mathbf{Q},V_pE)$. Assuming that $L(E,{\rm ad}^0(g),1)\neq 0$, they conjectured that the following are equivalent: (1) $\kappa_p(E,g,g^*)\neq 0$, (2) ${\rm dim}_{\mathbf{Q}_p}\mathrm{Sel}(\mathbf{Q},V_pE)=2$.

In this talk I will outline a proof of Darmon-Rotger's conjecture when $g$ has CM and the Tate-Shafarevich group of $E$ has finite $p$-primary part (and some mild additional hypotheses). If time permits, I'll also talk about the extension of these results to the case of supersingular primes $p$. Based on joint work with Ming-Lun Hsieh.

Spanishnumber theory

Audience: researchers in the topic


Seminario Latinoamericano de Teoría de Números

Series comments: El objetivo de este seminario es fomentar el desarrollo de la teoría de números en latinoamérica, y sus colaboraciones, por medio de exposiciónes de trabajos de investigación a cargo de personas pertenecientes a distintos centros de investigación, con intereses comunes en teoría de números (con especial énfasis en temas relacionados a curvas elípticas, formas modulares, representaciones de Galois, funciones L, y afines).

Videos y presentaciones de las charlas pasadas están disponibles en www.cmat.edu.uy/~tornaria/LATeN/

Organizers: Daniel Barrera*, Matilde Lalin*, Nicolás Sirolli*, Gonzalo Tornaría*
*contact for this listing

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