On the hitting time of Hamiltonicity in bipartite Dirac graphs

Abstract

Let $\varepsilon\in (0,1/2]$ and let $G$ be a balanced bipartite graph on $2n$ vertices with minimum degree at least $(1/2 + \varepsilon)n$. Then, whp, the hitting time for minimum degree 2 coincides with the hitting time for Hamiltonicity. This extends Bollobás--Kohayakawa and gives a bipartite analogue of Johansson's theorem. As an immediate corollary, we deduce a sharp threshold result for Hamiltonicity in such graphs.