Adhesion and the Geometry of the Cosmic Web
  We present a new way to formulate the geometry of the Cosmic Web in terms of Lagrangian space. The Adhesion model has an ingenious geometric interpretation out of which the spine of the Cosmic Web emerges naturally. Within this context we demonstrate a deep connection of the relation between Eulerian and Lagrangian space with that between Voronoi and Delaunay tessellations. 
Johan Hidding, Rien van de Weygaert, Gert Vegter and Bernard J. T.   Jones
astro-ph.CO math-ph math.MP