Multiverse Theory - Bubble Universe Theory

The bubble universe theory is a multiverse hypothesis that evolved from the theory of cosmic inflation. It's related to the concept of eternal inflation, which suggests that inflation might not end simultaneously in all regions of the universe and could continue in some areas. In specific regions where inflation has ceased, energy is converted into particles and radiation, forming new universes. These regions are envisioned as independent universes, much like bubbles. It's also proposed that each bubble universe could possess different initial conditions or physical constants. In the space between bubbles, inflation might continue, leading to the constant creation of new bubble universes. This could result in the overall multiverse forming an incredibly vast structure. Our own universe is also suggested to be one of these bubbles. Some research explores the possibility of traces of collisions with other bubble universes being imprinted on the cosmic microwave background radiation, but no definitive observational evidence has been found to date. Therefore, while the bubble universe theory is an intriguing hypothesis that naturally arises from certain models of inflationary theory, it remains an unverified concept.