Shotgun assembly of random graphs

Abstract

In the graph shotgun assembly problem, we are given the balls of radius $r$ around each vertex of a graph and asked to reconstruct the graph. We study the shotgun assembly of the Erdős-Rényi random graph $\mathcal{G}(n,p)$ for a wide range of values of $r$. We determine the threshold for reconstructibility for each $r\ge 3$, extending and improving substantially on results of Mossel and Ross for $r=3$. For $r=2$, we give upper and lower bounds that improve on results of Gaudio and Mossel by polynomial factors. We also give a sharpening of a result of Huang and Tikhomirov for $r=1$.

39 pages, 3 figures