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Geometric triangulation conjecture for cusped hyperbolic 3-manifolds

Establish whether every cusped finite-volume hyperbolic 3-manifold admits an ideal triangulation that is geometric, meaning all tetrahedra are positively oriented and convex with respect to the hyperbolic metric.

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Background

The authors situate their work in the broader landscape of triangulations in low-dimensional topology. While canonical decompositions into ideal polyhedra exist for cusped hyperbolic 3-manifolds, connecting these to triangulations with desirable geometric properties remains challenging.

They explicitly recall a longstanding conjecture asserting the existence of geometric triangulations for all cusped hyperbolic 3-manifolds, highlighting its status as an open problem.

References

It is an open conjecture that a cusped hyperbolic 3-manifold has a triangulation that is convex with respect to the hyperbolic metric, that is, geometric; see.

On Geometric triangulations of double twist knots (2504.09901 - Ibarra et al., 14 Apr 2025) in Introduction, first paragraph