Polynomial-dimension abelian-structure conjecture for linear approximate groups

Let F\mathbb F be a field, let d1d\geq1, and let AGLd(F)A\subset\operatorname{GL}_d(\mathbb F) be a KK-approximate group for some K1K\geq1. Polynomial-dimension abelian-structure conjecture. There exist polynomially bounded functions M1,M2 ⁣:Z>0RM_1,M_2\colon\mathbb Z_{>0}\to\mathbb R such that some abelian subgroup HGLd(F)H\leq\operatorname{GL}_d(\mathbb F) satisfies

A2H1(2K)M1(d)A21/M2(d).|A^2\cap H|\geq\frac{1}{(2K)^{M_1(d)}}|A^2|^{1/M_2(d)}.

This conjecture seeks to improve the paper's quasi-polynomial dependence on the dimension dd to polynomial dependence. It is presented as a possible strengthening and remains open.

Sources & referencesView supporting material

Primary source

Carl Schildkraut, “Abelian structure in approximate groups and Alon's conjecture on Ramsey Cayley graphs”, arXiv:2512.15125 (2025).

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