2004/04/02 by Robin Pemantle · 3 citations
Mathematics · #math.PR #msc:60C05 #msc:60K35
published as Ann. Probab., 19, 1559 - 1574 (1991) · 24 pages
arxiv created 2004/04/02 · arxiv updated 2009/12/01
Consider the nearest neighbor graph for the integer lattice Zd in d dimensions. For a large finite piece of it, consider choosing a spanning tree for that piece uniformly among all possible subgraphs that are spanning trees. As the piece gets larger, this approaches a limiting measure on the set of spanning graphs for Zd. This is shown to be a tree if and only if d=<4. In this case, the tree has only one topological end, i.e. there are no doubly infinite paths. When d>=5 the spanning forest has infinitely many components almost surely, with each component having one or two topological ends.