Optimising the vertex correspondence can substantially increase the number of edges shared by two independent realisations of the same random graph. We quantify this phenomenon for uniformly random $d$-regular graphs and derive corresponding results for their edge-based graph edit distance. For every fixed $d\geq 3$, we show that the maximum overlap is $n+Θ_{\mathbb P}(n/\log n)$, where the leading term $n$ arises from Hamiltonicity, while the surplus captures the optimal order of the excess beyond it. We establish explicit upper and lower bounds on the surplus. The upper bound is obtained by counting common cores of minimum degree at least two, while the lower bound is established using spanning factors consisting of cycles of the same logarithmic length. For the special case $d=2$, we show that the maximum overlap is $n-(1+o_{\mathbb P}(1))\log n$. The additional overlap achievable is also studied by rotating aligned Hamilton cycles, using a contiguity argument. As a by-product, we determine the asymptotic maximum overlap between unions of independent random perfect matchings under cyclic shifts.

翻译：暂无翻译