On the Fontaine-Mazur conjecture for $p=3$

Abstract

We prove the remaining $p=3$ cases of the regular two-dimensional Fontaine-Mazur conjecture over $\mathbb{Q}$, thereby completing the regular case for all odd primes. Our main new input is a potential big $R=\mathbb{T}$ theorem for large-dimensional components of global pseudo-deformation spaces, valid for all odd primes. After a single abelian base change, propagation of pro-modularity and induction on partial ordinariness reduce the componentwise argument to the case of globally irreducible ordinary points. A characteristic-zero Greenberg-Wiles dimension estimate supplies the additional ordinary deformation-theoretic input needed in the exceptional case. We combine these arguments with small-prime $p$-adic Langlands correspondence, local deformation theory and patching.

arXiv comment59 pages. Major change