Giacomo Cacciapaglia

In particle theory, there’s a puzzling phenomenon that usually calls for a new particle. But the authors found that this role falls to ordinary hydrogen and antihydrogen, forming a special combination. The discovery brings the atomic world and fundamental forces closer together.

Black hole mergers can create tiny mini black holes that quickly evaporate, flashing with gamma-ray light. A search for such signals in the Fermi telescope archive came up empty, but it allowed to rule out certain masses for these crumbs.

The laws of physics forbid black holes from dividing: their total area cannot decrease, just like entropy. But rapid rotation changes the rules, allowing tiny fragments to break off. In worlds with extra dimensions, fragmentation is even easier, revealing secrets of primordial black holes.