The theory of inflation is linked to the idea that the universe is constantly giving birth to smaller "pocket" universes within an ever-expanding multiverse.
The BICEP2 experiment has detected signs of gravitational waves in the cosmic microwave background radiation, with big implications for the theory of cosmic inflation.
In 2023, the ALICE experiment was ready for their best year yet, until a mysterious signal threatened everything. As the LHC wraps up its 2025 lead-ion run, physicists recall how they worked together to solve the puzzle.