English

The complement of the figure-eight knot geometrically bounds

Geometric Topology 2019-10-22 v4 Combinatorics Metric Geometry

Abstract

We show that some hyperbolic 3-manifolds which are tessellated by copies of the regular ideal hyperbolic tetrahedron embed geodesically in a complete, finite volume, hyperbolic 4-manifold. This allows us to prove that the complement of the figure-eight knot geometrically bounds a complete, finite volume hyperbolic 4-manifold. This the first example of geometrically bounding hyperbolic knot complement and, amongst known examples of geometrically bounding manifolds, the one with the smallest volume.

Keywords

Cite

@article{arxiv.1511.08684,
  title  = {The complement of the figure-eight knot geometrically bounds},
  author = {Leone Slavich},
  journal= {arXiv preprint arXiv:1511.08684},
  year   = {2019}
}

Comments

9 pages, 4 figures, typos corrected, improved exposition of tetrahedral manifolds. Added Proposition 3.3, which gives necessary and sufficient conditions for M_T to be a manifold, and Remark 4.4, which shows that the figure-eight knot bounds a 4-manifold of minimal volume. Updated bibliography