What are parallel universes? Are there any scientific theories or evidence in favour or against of their existence?
Parallel universes, also known as a multiverse, is a concept in theoretical physics that suggests the existence of multiple universes, each with its own set of physical laws, properties, and even histories. In the context of the multiverse theory, our universe is just one of many.

There are several scientific theories that propose the existence of parallel universes, each based on different concepts in physics. Some of these theories include:

1. Many-worlds interpretation: This theory proposes that every possible outcome of any event actually occurs in different universes, branching out from every possible decision or event.
2. String theory: This theory suggests that there may be up to 11 dimensions of space-time, with our universe being one of many membranes or branes that exist in a larger space-time. Other branes may contain their own universes, some of which may have different physical properties than our own.
3. Inflationary cosmology: This theory proposes that the universe underwent a period of rapid expansion in the moments after the Big Bang, resulting in the creation of multiple bubble universes, each with its own properties.

Despite the intriguing possibilities, there is currently no direct evidence to support the existence of parallel universes, and some physicists argue that the idea is untestable and thus not truly scientific. However, ongoing research in theoretical physics, particularly in areas such as string theory and quantum mechanics, continues to explore the possibility of the multiverse and its potential implications.
If there are truly infinitely many universes and if all have infinite possibilities then wouldn't it be possible fot the existence of a universe which has confirmed the theory and are monitoring other universes and stopping them from finding out about the truth?