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Anosov groups that are indiscrete in rank one

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arxiv 2210.17549 v2 pith:HYKKYTUW submitted 2022-10-31 math.GR

classification math.GR
keywords mathsfanosovdeltagammagroupslatticesubgroupsuniform
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abstract

We exhibit Anosov subgroups of $\mathsf{SL}_d(\mathbb{R})$ that do not embed discretely in any rank-$1$ simple Lie group of noncompact type, or indeed, in any finite product of such Lie groups. These subgroups are isomorphic to free products $\Gamma * \Delta$, where $\Gamma$ is a uniform lattice in $\mathsf{F}_4^{(-20)}$ and $\Delta$ is a uniform lattice in $\mathsf{Sp}(m,1)$, $m \geq 51$.

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  1. Bordered hyperbolic manifolds with a fixed perimeter-to-volume ratio

    math.GT 2026-07 accept novelty 6.5 of 10

    For every n≥3 there are infinitely many pairwise incommensurable finite-volume hyperbolic n-manifolds with totally geodesic boundary sharing one fixed perimeter-to-volume ratio.

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