Late-forming primordial black holes

by Zachary Picker (UCLA)

Thursday 13 Apr 2023, 16:00 → 18:00 Australia/Sydney

almost every week, bored theorists work out a new way in which primordial black holes can be produced. one particularly interesting mechanism involves the collapse of dark matter substructure into black holes. depending on the specifics of the dark sector, it is possible to form such dark structures early, but have them collapse only very late in the universe---even today. the black holes which form from these collapses could be very light, but would evade the majority of constraints on their abundance which are usually set in the early universe. these black holes must then be constrained by late-time observations of their hawking radiation, such as in diffuse gamma rays or in the galactic center, where a population of these exploding black holes may even be able to explain the galactic center excess.