English

Expansion of random $0/1$ polytopes

Combinatorics 2022-07-11 v1 Probability

Abstract

A conjecture of Mihail and Vazirani states that the edge expansion of the graph of every 0/10/1 polytope is at least one. Any lower bound on the edge expansion gives an upper bound for the mixing time of a random walk on the graph of the polytope. Such random walks are important because they can be used to generate an element from a set of combinatorial objects uniformly at random. A weaker form of the conjecture of Mihail and Vazirani says that the edge expansion of the graph of a 0/10/1 polytope in Rd\mathbb{R}^d is greater than 1 over some polynomial function of dd. This weaker version of the conjecture would suffice for all applications. Our main result is that the edge expansion of the graph of a random\textit{random} 0/10/1 polytope in Rd\mathbb{R}^d is at least 112d\frac{1}{12d} with high probability.

Keywords

Cite

@article{arxiv.2207.03627,
  title  = {Expansion of random $0/1$ polytopes},
  author = {Brett Leroux and Luis Rademacher},
  journal= {arXiv preprint arXiv:2207.03627},
  year   = {2022}
}