Stoll's finite-subscheme conjecture for Chabauty–Coleman loci

Let XX) be a smooth projective curve of genus g2g\geq2 whose Jacobian has Mordell–Weil rank at most g2g-2. Let U1pU_1^p denote the abelianisation of the fundamental group of XQX_{\overline{\mathbb Q}}. Stoll's conjecture. There is a finite subscheme ZXZ\subset X, defined over Q\mathbb Q, such that

X(Qp)U1pZ(Qp)X(\mathbb Q_p)_{U_1^p}\subseteq Z(\mathbb Q_p)

for all primes pp in a set of Dirichlet density 11. Because ZZ is finite and defined over Q\mathbb Q, Z(Qp)Z(\mathbb Q_p) consists only of algebraic points. The conjecture strengthens the expectation that the abelian non-abelian Chabauty loci contain only algebraic points by requiring one finite subscheme, independent of pp, to interpolate them; the source notes that its formulation differs slightly from Stoll's original result.

Sources & referencesView supporting material

Primary source

L. Alexander Betts, “On a non-abelian analogue of a conjecture of Michael Stoll”, arXiv:2508.19947 (2025).

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