Abstract:
We discuss the correspondence between black holes and saturons—objects that saturate unitarity bounds— and show that both share similar thermodynamic properties, such as entropy following the Bekenstein-Hawking formula and thermal evaporation. This correspondence highlights that black holes are a specific case of a broader class of objects, the study of which yields new phenomena. Firstly, we discuss the memory burden effect, which stabilizes systems by the information they carry, and how it affects black hole decay after significant mass loss. It implies that primordial black holes, previously thought to have evaporated, may still exist as viable dark matter candidates. Secondly, our study of vorticity in saturons suggests that vortex formation during black hole mergers can cause macroscopic deviations in the gravitational wave signal, potentially leaving detectable signatures in future gravitational wave observations.