Weak covering conjecture for infinite Cayley graphs

Let Γ\Gamma be an infinite Cayley graph that is not quasi-isometric to Z\mathbf Z. A graph Δ\Delta is a cover of Γ\Gamma if there is a covering map from Γ\Gamma to Δ\Delta; write Δ≄Γ\Delta\not\simeq\Gamma when the graphs are not isomorphic. Weak covering conjecture. Every infinite Cayley graph Γ\Gamma, not quasi-isometric to Z\mathbf Z, covers an infinite transitive graph Δ≄Γ\Delta\not\simeq\Gamma. This is a weak form of a question of Benjamini and Duminil-Copin concerning coverings of infinite transitive graphs by graphs of bounded girth. The proposed statement is disproved by possible counterexamples arising from Cayley graphs of strongly simple groups.

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Primary source

Paul-Henry Leemann, “Schreier graphs: transitivity and coverings”, arXiv:1505.03433 (2015).

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