Abstract
Let $\mathrm{AD}(G_{n,d})$ be the average distance of $G_{n,d}$, a random $n$-vertex $d$-regular graph.
 For $d=(\beta+o(1))n^{\alpha}$ with two arbitrary constants $\alpha\in(0,1)$ and $\beta>0$, we prove that $|\mathrm{AD}(G_{n,d})-\mu|<\epsilon$ holds with high probability for any constant $\epsilon>0$, where $\mu$ is equal to $\alpha^{-1}+\exp(-\beta^{1/\alpha})$ if $\alpha^{-1}\in\mathbb{N}$ and to $\lceil\alpha^{-1}\rceil$ otherwise.
 Consequently, we show that the diameter of the $G_{n,d}$ is equal to $\lfloor\alpha^{-1}\rfloor+1$ with high probability.
Highlights
For d = (β + o(1))nα with two arbitrary constants α ∈ (0, 1) and β > 0, we prove that |AD(Gn,d) − μ| < holds with high probability for any constant
The study of the diameter of regular graphs is well motivated in graph theory
A central question is how to construct an n-vertex d-regular graph with the minimum possible diameter, which has an application to high-performance computing [12, 17, 26]
Summary
The study of the diameter of regular graphs is well motivated in graph theory. A central question is how to construct an n-vertex d-regular graph with the minimum possible diameter, which has an application to high-performance computing [12, 17, 26]. Let D (n, d) denote the Moore bound, a well-known lower bound of the minimum possible diameter among all n-vertex d-regular graphs [26] (we will present the bound in Equation (3)). We show that the diameter diam(Gn,d) of a random d-regular graph Gn,d of d = (β + o(1))nα with two arbitrary constants α ∈ (0, 1) and β > 0 satisfies. We study the average distance AD(Gn,d) of a random regular graph. Gn,d of d = (β + o(1))nα with arbitrary constant α seems to be far from these methods Another recent remarkable approach for the study of Gn,d is to compare Gn,d with an Erdos-Renyi graph G(n, p) of p = nd. We can immediately obtain Theorem 2 by combining the coupling of [15] and known results cencerning the diameter of G(n, p). There exist absolute constants C1, C2 > 0 such that |AD(G(n, p)) − μ| C1n−C2 holds w.h.p
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