The noncommutative arithmetic progression conjecture for compact quantum groups

Let G\mathbb{G} be the compact quantum group under consideration, let G^\widehat{\mathbb{G}} be its set of irreducible representations, and let Σ={Fn}\Sigma=\{F_n\} be a sequence of finite subsets of G^\widehat{\mathbb{G}}. For a subset ΛG^\Lambda\subseteq\widehat{\mathbb{G}}, write Λw|\Lambda|_w for its weighted cardinality. Say that Λ\Lambda has positive upper density with respect to Σ\Sigma if

lim supnΛFnwFnw>0.\limsup_{n\to\infty}\frac{|\Lambda\cap F_n|_w}{|F_n|_w}>0.

For α,βG^\alpha,\beta\in\widehat{\mathbb{G}}, say that Λ\Lambda contains αjβ\alpha^j\beta when every irreducible representation contained in the tensor-product representation αjβ\alpha^j\beta belongs to Λ\Lambda. Let G^Σ\widehat{\mathbb{G}}_\Sigma denote the subset of representations associated with the sequence Σ\Sigma. Noncommutative arithmetic progression conjecture. If ΛG^\Lambda\subseteq\widehat{\mathbb{G}} has positive upper density with respect to Σ\Sigma, then for every k>0k>0 there exist αG^Σ\alpha\in\widehat{\mathbb{G}}_\Sigma, βG^\beta\in\widehat{\mathbb{G}}, and n>0n>0 such that Λ\Lambda contains αjnβ\alpha^{jn}\beta for every integer jj with 0jk10\leq j\leq k-1. This conjecture predicts arithmetic-progression-like configurations inside every positive-density subset of the dual object, extending the preceding arithmetic-progression theorem to the compact quantum-group setting. The supplied text does not state whether the conjecture is resolved.

Sources & referencesView supporting material

Primary source

Huichi Huang, “The quantum group fixing a sequence of finite subsets”, arXiv:1607.07276 (2017).

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