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Thin right-angled Coxeter groups in some uniform arithmetic lattices (2111.07277v1)

Published 14 Nov 2021 in math.GR, math.GT, and math.NT

Abstract: Using a variant of an unpublished argument due to Agol, we show that an irreducible right-angled Coxeter group on ${n \geq 3}$ vertices embeds as a thin subgroup of a uniform arithmetic lattice in an indefinite orthogonal group $\mathrm{O}(p, q)$ for some $p, q \geq 1$ satisfying $p+q=n$.

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