English

Disjoint Hamilton cycles in the random geometric graph

Combinatorics 2009-07-28 v1 Probability

Abstract

We prove a conjecture of Penrose about the standard random geometric graph process, in which n vertices are placed at random on the unit square and edges are sequentially added in increasing order of lengths taken in the l_p norm. We show that the first edge that makes the random geometric graph Hamiltonian is a.a.s. exactly the same one that gives 2-connectivity. We also extend this result to arbitrary connectivity, by proving that the first edge in the process that creates a k-connected graph coincides a.a.s. with the first edge that causes the graph to contain k/2 pairwise edge-disjoint Hamilton cycles (for even k), or (k-1)/2 Hamilton cycles plus one perfect matching, all of them pairwise edge-disjoint (for odd k).

Keywords

Cite

@article{arxiv.0907.4459,
  title  = {Disjoint Hamilton cycles in the random geometric graph},
  author = {Xavier Pérez-Giménez and Nicholas C. Wormald},
  journal= {arXiv preprint arXiv:0907.4459},
  year   = {2009}
}
R2 v1 2026-06-21T13:29:02.735Z