English

Hamilton cycles in weighted Erd\H{o}s-R\'enyi graphs

Combinatorics 2020-12-23 v1

Abstract

Given a symmetric n×nn\times n matrix PP with 0P(u,v)10 \le P(u, v)\le 1, we define a random graph Gn,PG_{n, P} on [n][n] by independently including any edge {u,v}\{u, v\} with probability P(u,v)P(u, v). For k1k\ge 1 let Ak\mathcal{A}_k be the property of containing k/2\lfloor k/2 \rfloor Hamilton cycles, and one perfect matching if kk is odd, all edge-disjoint. With an eigenvalue condition on PP, and conditions on its row sums, Gn,PAkG_{n, P}\in \mathcal{A}_k happens with high probability if and only if Gn,PG_{n, P} has minimum degree kk whp. We also provide a hitting time version. As a special case, the random graph process on pseudorandom (n,d,μ)(n, d, \mu)-graphs with μd(d/n)α\mu \le d(d/n)^\alpha for some constant α>0\alpha > 0 has property Ak\mathcal{A}_k as soon as it acquires minimum degree kk with high probability.

Keywords

Cite

@article{arxiv.2012.11953,
  title  = {Hamilton cycles in weighted Erd\H{o}s-R\'enyi graphs},
  author = {Tony Johansson},
  journal= {arXiv preprint arXiv:2012.11953},
  year   = {2020}
}