English

Scale-free percolation mixing time

Probability 2021-11-10 v1

Abstract

Assign to each vertex of the one-dimensional torus i.i.d. weights with a heavy-tail of index τ1>0\tau-1>0. Connect then each couple of vertices with probability roughly proportional to the product of their weights and that decays polynomially with exponent α>0\alpha>0 in their distance. The resulting graph is called scale-free percolation. The goal of this work is to study the mixing time of the simple random walk on this structure. We depict a rich phase diagram in α\alpha and τ\tau. In particular we prove that the presence of hubs can speed up the mixing of the chain. We use different techniques for each phase, the most interesting of which is a bootstrap procedure to reduce the model from a phase where the degrees have bounded averages to a setting with unbounded averages.

Keywords

Cite

@article{arxiv.2111.05201,
  title  = {Scale-free percolation mixing time},
  author = {Alessandra Cipriani and Michele Salvi},
  journal= {arXiv preprint arXiv:2111.05201},
  year   = {2021}
}

Comments

38 pages, 2 figures. Comments are welcome

R2 v1 2026-06-24T07:32:26.720Z