A star is born: Explosive Crump-Mode-Jagers branching processes in random environment

Abstract: We study a family of Crump-Mode-Jagers branching processes in random environment that explode, i.e. that grow infinitely large in finite time with positive probability. Building on recent work of the author and Iyer, we weaken certain assumptions required to prove that the branching process, at the time of explosion, contains a (unique) individual with an infinite offspring. We then apply these results to super-linear preferential attachment models. In particular, we fill gaps in some of the cases analysed in earlier work of the author and Iyer, and a study large range of previously unattainable cases.