The weak unramified Fontaine–Mazur conjecture

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Let KK be a number field, and let GK,∅(p)G_{K,\emptyset}(p) be the Galois group of the maximal everywhere unramified pro-pp-extension of KK.

Weak unramified Fontaine–Mazur conjecture. Every continuous homomorphism

ρ:GK,∅(p)→GL⁡n(Qp)\rho:G_{K,\emptyset}(p)\to \operatorname{GL}_n(\mathbb{Q}_p)

has finite image.

This is implied by the unramified Fontaine–Mazur conjecture for S=∅S=\emptyset. Although GK,∅(p)G_{K,\emptyset}(p) can be infinite by the Golod–Shafarevich theorem, the conjecture asserts that it has no infinite-image pp-adic linear representations. The source gives no resolution in general.

References

Primary source

Yufan Luo, “On the Boston's Unramified Fontaine-Mazur Conjecture”, arXiv:2404.18967 (2024).

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