Entanglement of embedded graphs. Toen Castle with Myf Evans, Vanessa Robins AND Stephen Hyde
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1 Entanglement of embedded graphs Toen Castle with Myf Evans, Vanessa Robins AND Stephen Hyde Workshop on Topology: Identifying Order in Complex Systems Saturday, 18 April 2015 The Institute for Advanced Study
2 Ταλκ στρυχτυρε 1. Εµβεδδεδ γραπησ ανδ µεασυρεσ οφ τηειρ εντανγλεµεντ. 2. Εξιστενχε οφ νον-κνοτ ανδ νον-λινκ εντανγλεµεντ (ραϖελσ). 3. Χοµπλεξ ραϖελσ ανδ τηειρ προπερτιεσ. 4. Ρελατινγ εντανγλεµεντ ανδ πλαναριτψ, τηεν χλασσιφψινγ εντανγλεµεντ τψπεσ.
3 1. Σταρτινγ τηε στορψ - µακινγ εµβεδδεδ γραπησ φροµ συρφαχε τιλινγσ επινετ Ευχλιδεαν Παττερνσ Ιν Νον Ευχλιδεαν Τιλινγσ επινετ.ανυ.εδυ.αυ Τριπλψ Περιοδιχ Μινιµαλ Συρφαχε Στεπηεν Ηψδε, Στυαρτ Ραµσδεν, ςανεσσα Ροβινσ, Ολαφ Δελγαδο Φρειδριχησ
4 Π Γ ΥΘΧ11 Δ επινετ.ανυ.εδυ.αυ Στεπηεν Ηψδε, ςανεσσα Ροβινσ, Ολαφ Δελγαδο Φρειδριχησ, Στυαρτ Ραµσδεν
5 ? Στανδαρδ µαπ φροµ Η 2 το ΤΠΜΣ Μαππινγ Η 2 το ΤΠΜΣ ωιτη α σηεαρεδ υνιτ χελλ A note on the two symmetry-preserving covering maps of the gyroid minimal surface V. Robins 1,a, S.J. Ramsden 1, and S.T. Hyde 1
6 Τηε µαπ βετωεεν τηε τορυσ ανδ ιτσ υνιϖερσαλ χοϖερ, τηε Ευχλιδεαν πλανε.
7 Remove the torus and you ve got a graph embedding in space.
8 K4, the tetrahedral graph, embeds on the sphere in the standard tetrahedral way (without entanglements). On the torus, this graph can be more topologically interesting.
9 Two embeddings of K4 on the torus, with one and two (respectively) trefoils.
10 Cube examples Torus examples with slightly stretched unit cells.
11 Tabulating entanglement via constituent (torus) knots and (torus) links.
12 Φινισηινγ τηε στορψ - σηεαρινγ τηε υνιτ χελλσ ιν Η 3 ανδ ον ΤΠΜΣ σ Periodic entanglement I: networks from hyperbolic reticulations Myfanwy E. Evans, Vanessa Robins and Stephen T. Hyde Acta Cryst. (2013). A69,
13 Periodic entanglement I: networks from hyperbolic reticulations Myfanwy E. Evans, Vanessa Robins and Stephen T. Hyde Acta Cryst. (2013). A69,
14 Analysis of entanglement So far: looking for knots and links in cycles There are other measures too, inspired by knot theory. Some are topological or have topological flavours: - Minimum crossing number of a planar embedding - Graph embedding polynomials Others are geometric: - Line fattening á la Jon Simon s ideal knots (Myf s SONO algorithm), - KnotPlot-style energy minimisations, - Self-illumination measures, - Average crossing number when viewed from different angles, etc. I care about topology.
15 But what about these guys? Kinsohita,1972 Splicing a rope (The Ashley Book of Knots)
16 2. Εξιστενχε οφ νον-κνοτ ανδ νον-λινκ εντανγλεµεντ (ραϖελσ).
17 Vertex ravels are examples of entanglements that contain neither knots nor links. They are entanglements in the edges centred around a vertex. Any number of edges can be involved. Ravels: Knot free but not free, Toen Castle, Myfanwy E. Evans, and S. T. Hyde. New Journal Of Chemistry, 2008
18 Σοµεονε ελσε σ δεφινιτιον UNRAVELLING TANGLED GRAPHS 2012 CATHERINE FARKAS, ERICA FLAPAN and WYNN SULLIVAN Προβλεµ (σελεχτιϖε ραϖελ): Χονσιδερ α χυτ ποιντ ορ βριδγε-ϖερτεξ
19 UNRAVELLING TANGLED GRAPHS 2012 CATHERINE FARKAS, ERICA FLAPAN and WYNN SULLIVAN Definition 1.2: Let B be a ball containing a graph G consisting of an n-valent vertex v connected by straight edges to vertices lying in B. Let Γ denote the graph obtained by bringing together the pathwise connected vertices of G-v in B. If Γ is non-planar but contains no knots then the pair (B,G) is said to be a vertex n-ravel and the embedded graph Γ is said to be ravelled.
20 Ugly definition from my thesis Definition 1.2: Consider a graph G with embedding E(G) in S3. Let there be a simply connected domain D containing an n-valent vertex v of G such that E(G) and δd intersect at only n points, one for each connected edge of v. A new graph Gʹ and graph embedding R(Gʹ ) can be created if there exists more than one closure points that can be added to δd (the boundary of D), and the edges of E(G) can be brought together without crossing within δd to connect to these closure points such that at least two edges terminate at each closure point. If R(Gʹ ) is non-planar while containing no knots, then such a graph embedding is an example of a selective vertex n-ravel around vertex v. If there is only one required closure point, then the vertex ravel satisfies the more stringent requirements of a universal n-ravel.
21 Features of vertex ravels A shelled vertex ravel.
22 Vertex ravels are similar to the Borromean rings : if any component is removed, the entanglement falls apart. Vertex ravel Borromean rings
23 Vertex ravels in small graphs
24 3. Χοµπλεξ ραϖελσ ανδ τηειρ προπερτιεσ.
25 Introduction to wandering ravels (a) A ravelled vertex (b) An unravelled vertex vertex ravels
26 Wandering ravels are extensions of vertex ravels which can travel through the graph embedding
27 A more complex ravel, not restricted to the neighbourhood of a single vertex The ravelled graph embedding The ravelled embedding re-drawn The tetrahedral graph The constituent cycles
28 The importance of anchors
29 More anchors Ravel Not a ravel
30 Wandering ravels have a (knot free and link free) chain of entanglement travelling through the network.
31 Polytropic ravels are more complex. They are conceptually based on the set of links: A polytropic ravel can contain branches, and so allows branching chains of entangled edges to travel through the network.
32 Polytropic ravels have a graph structure. They contain analogues of edges and vertices, embedded in space. So they are a kind of meta-graph embedding, living within the entanglement in a graph embedding. A vertex ravel tied in the meta structure of a polytropic ravel.
33 Ρελατινγ εντανγλεµεντ ανδ πλαναριτψ, τηεν χλασσιφψινγ εντανγλεµεντ τψπεσ (ϖερψ µυχη ωορκ ιν προγρεσσ). Ρεχαλλ: Definition 1.2: Let B be a ball containing a graph G consisting of an n-valent vertex v connected by straight edges to vertices lying in B. Let Γ denote the graph obtained by bringing together the pathwise connected vertices of G-v in B. If Γ is non-planar but contains no knots then the pair (B,G) is said to be a vertex n-ravel and the embedded graph Γ is said to be ravelled.
34 Entanglement is quite a fraught concept, especially as it relates to graphs with no untangled embedding. Periodicity adds a further issues. Selective ravels i.e. Ladder graph
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36 My hypothesised taxonomy of entanglement Knots Links Ravels The planet of a lazy man.
37 Thanks to Stephen Hyde, Vanessa Robins and Myf Evans for their earlier work with me, and the Australian taxpayer for allowing long, free, government funded PhDs without any duties. Honourable mention: THERE EXIST NO MINIMALLY KNOTTED PLANAR SPATIAL GRAPHS ON THE TORUS SENJA BARTHEL arxiv
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