Universality of the Galois action on the thrice-punctured projective line

Let FF be a number field, let pp be a prime, and let GFG_F be its absolute Galois group. For every tangential base point 0v0_v supported at 00, consider

Qp[π1proalg(PF1{0,1,},0v)]GFfin.\overline{\mathbb{Q}}_p[\pi_1^{\mathrm{pro-alg}}({\mathbb P}^1_{\overline{F}}\setminus\{0,1,\infty\},0_v)]^{G_F-\mathrm{fin}}.

Universality conjecture. Any irreducible Qp\overline{\mathbb{Q}}_p-representation of GFG_F that is almost everywhere unramified and de Rham at places above pp can be established as a subquotient of this space for every tangential base point 0v0_v supported at 00. The claim is presented as the second conjecture in the paper’s reformulation of the Fontaine–Mazur conjecture; the supplied text gives no resolution status.

Sources & referencesView supporting material

Primary source

Alexander Petrov, “Universality of the Galois action on the fundamental group of P^1\0,1,\”, arXiv:2109.09301 (2024).

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