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We survey some tools and techniques for determining geometric properties of a link complement from a link diagram. In particular, we survey the tools used to estimate geometric invariants in terms of basic diagrammatic link invariants. We…

Geometric Topology · Mathematics 2019-09-27 David Futer , Efstratia Kalfagianni , Jessica S. Purcell

This book is an introduction to hyperbolic geometry in dimension three, and its applications to knot theory and to geometric problems arising in knot theory. It has three parts. The first part covers basic tools in hyperbolic geometry and…

Geometric Topology · Mathematics 2020-03-02 Jessica S. Purcell

Twisted torus knots and links are given by twisting adjacent strands of a torus link. They are geometrically simple and contain many examples of the smallest volume hyperbolic knots. Many are also Lorenz links. We study the geometry of…

Geometric Topology · Mathematics 2014-05-20 Abhijit Champanerkar , David Futer , Ilya Kofman , Walter Neumann , Jessica S. Purcell

We show that for a large class of hyperbolic knots and links, we can determine bounds on the volume of the link complement from combinatorial information given by a link diagram. Specifically, there is a universal constant C such that if a…

Geometric Topology · Mathematics 2014-10-01 Jessica S. Purcell

We prove that the knots and links in the infinite set of $3$-highly twisted $2m$-plats, with $m \geq 2$, are all hyperbolic. This should be compared with a result of Futer-Purcell for $6$-highly twisted diagrams. While their proof uses…

Geometric Topology · Mathematics 2021-11-30 Nir Lazarovich , Yoav Moriah , Tali Pinsky

We prove that the knots and links that admit a 3-highly twisted irreducible diagram with more than two twist regions are hyperbolic. This should be compared with a result of Futer-Purcell for 6-highly twisted diagrams. While their proof…

Geometric Topology · Mathematics 2025-03-12 Nir Lazarovich , Yoav Moriah , Tali Pinsky

It is conjectured that every cusped hyperbolic 3-manifold admits a geometric triangulation, i.e. it is decomposed into positive volume ideal hyperbolic tetrahedra. Here, we show that sufficiently highly twisted knots admit a geometric…

Geometric Topology · Mathematics 2023-06-14 Sophie L. Ham , Jessica S. Purcell

Classical fully augmented links have explicit hyperbolic geometry, and have diagrams on the 2-sphere in the 3-sphere. We generalise to construct fully augmented links projected to the reflection surface of any 3-manifold obtained by…

Geometric Topology · Mathematics 2025-02-27 Jessica S. Purcell , Corbin Reid , John Stewart

We describe relations between hyperbolic geometry and codimension two knots or, more exactly, between varieties of conjugacy classes of discrete faithful representations of the fundamental groups of hyperbolic n-manifolds M into…

Geometric Topology · Mathematics 2007-05-23 Boris Apanasov

We consider knots and links in handlebodies that have hyperbolic complements and operations akin to composition. Cutting the complements of two such open along separating twice-punctured disks such that each of the four resulting…

Geometric Topology · Mathematics 2023-03-07 Colin Adams , Daniel Santiago

We present new techniques to show hyperbolicity of links based on geometric/combinatorial topology. Our techniques are applicable to links that have at least one unknotted component. In particular, they are applicable to Brunnian links. We…

Geometric Topology · Mathematics 2025-08-19 Sheng Bai

This paper introduces a new approach to finding knots and links with hidden symmetries using "hidden extensions", a class of hidden symmetries defined here. We exhibit a family of tangle complements in the ball whose boundaries have…

Geometric Topology · Mathematics 2016-09-20 Eric Chesebro , Jason DeBlois

A generalized augmented link of a knot $K$ is a link obtained by adding trivial components to $K$ that bound $n$-punctured disks. In this paper we consider that $K$ is given by a positive braid with at least one full twist. We characterize…

Geometric Topology · Mathematics 2024-06-17 Thiago de Paiva

We show that the cusp volume of a hyperbolic alternating knot can be bounded above and below in terms of the twist number of an alternating diagram of the knot. This leads to diagrammatic estimates on lengths of slopes, and has some…

Geometric Topology · Mathematics 2016-09-21 Marc Lackenby , Jessica S. Purcell

We extend the list of known band structure topologies to include a large family of hyperbolic nodal links and knots, occurring both in conventional Hermitian systems where their stability relies on discrete symmetries, and in the…

Mesoscale and Nanoscale Physics · Physics 2019-08-14 Marcus Stålhammar , Lukas Rødland , Gregory Arone , Jan Carl Budich , Emil J. Bergholtz

We consider the existence of simple closed geodesics or "geodesic knots" in finite volume orientable hyperbolic 3-manifolds. Previous results show that at least one geodesic knot always exists [Bull. London Math. Soc. 31(1) (1999) 81-86],…

Geometric Topology · Mathematics 2013-01-02 Sally M Kuhlmann

We generalize the results of [AS], finding large classes of totally geodesic Seifert surfaces in hyperbolic knot and link complements, each the lift of a rigid 2-orbifold embedded in some hyperbolic 3-orbifold. In addition, we provide a…

We extend the theory of hyperbolicity of links in the 3-sphere to tg-hyperbolicity of virtual links, using the fact that the theory of virtual links can be translated into the theory of links living in closed orientable thickened surfaces.…

Geometric Topology · Mathematics 2019-04-16 Colin Adams , Or Eisenberg , Jonah Greenberg , Kabir Kapoor , Zhen Liang , Kate O'Connor , Natalia Pacheco-Tallaj , Yi Wang

The ratio of volume to crossing number of a hyperbolic knot is known to be bounded above by the volume of a regular ideal octahedron, and a similar bound is conjectured for the knot determinant per crossing. We investigate a natural…

Geometric Topology · Mathematics 2018-11-16 Abhijit Champanerkar , Ilya Kofman , Jessica S. Purcell

We study closed geodesics on hyperbolic surfaces, and give bounds for their angles of intersection and self-intersection, and for the sides of the polygons that they form, depending only on the lengths of the geodesics

Geometric Topology · Mathematics 2019-05-28 Max Neumann-Coto , Peter Scott
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