FA32 and on Zoom: https://stockholmuniversity.zoom.us/j/62320153507
Primordial black holes are black holes that may have formed in the early Universe. Their masses potentially span a range from as low as the Planck scale up to many orders of magnitude above the solar mass. This, in particular, includes black holes with mass and spin comparable to those discovered by LIGO/Virgo. These may well be primordial in nature, which may also be true for certain confirmed microlensing events in the planetary-mass range as well as for the seeds for the super-massive black holes in galactic centres. After a general introduction to primordial black holes, I will discuss the manifold observational hints for their existence on multiple scales. I will introduce a natural, assumption-minimal scenario in which the thermal history of the Universe itself is responsible for explaining all of those.