Quantum Inflation Theory (QIT) is a mind-bending concept that will make you question everything you thought you knew about the universe.
Decoherence is a phenomenon where quantum fluctuations in the vacuum cause the fabric of space-time to become all wobbly and stuff. Like, imagine the universe is a big ol' plate of Jell-O, and then someone sneaks up behind you and gives it a good shake.
As a result of decoherence, the smooth, deterministic nature of classical physics gives way to the messy, probabilistic realm of quantum mechanics. It's like the universe is a crazy, drunk person trying to get dressed for a night out, and everything is just, well, a mess.
Wormholes: The Cosmic Sausage Party Many-Worlds Interpretation: Where the Multiverse Comes to Get You