Parallel worlds and alternate universes have long been a loved theme of interest in Twilight Zone episodes and science fiction movies and literature. Like much other science fiction subject matter, parallel worlds actually do have some scientific data behind it, although many are still very skeptical.
"The idea of parallel universes in quantum mechanics has been around since 1957," said physicist at Griffith University in Brisbane, Australia, Howard Wiseman, who was also part of the team of physicists that came up with the ‘Many-Worlds Interpretation’ (MWI).
"In the well-known ‘Many-Worlds Interpretation’, each universe branches into a bunch of new universes every time a quantum measurement is made. All possibilities are therefore realized – in some universes the dinosaur-killing asteroid missed Earth. In others, Australia was colonized by the Portuguese."
Yet despite what the name of the name of the MWI seems to suggest, these other worlds and universes have absolutely no proven effect on our own. Thus leaving skeptical physicists all the more doubting, while many parallel world theories often get ridiculed or put on the back burner by many mainstream scientists, the String Theory is a way to make sense of multiple dimensions mathematically. The String Theory states that within the theoretical framework of the theory, point-like particles of particle physics are replaced by one-dimensional objects called strings and describes how these strings circulate through space and interact with each other.
Superstring theory goes a step farther and attempts to explain all of the particles and fundamental forces of nature in one theory by modelling them as vibrations of tiny supersymmetric strings. For mathematical consistency, both theories require extra dimensions of space-time. The String Theory suggests that space-time is 26-dimensional, while superstring theory is 10-dimensional.
"You almost can't avoid having some version of the multiverse in your studies if you push deeply enough in the mathematical descriptions of the physical universe," said physicist Brian Greene who authored the book The Hidden Reality: Parallel Universes and the Deep Laws of the Cosmos.
"There are many of us thinking of one version of parallel universe theory or another. If it's all a lot of nonsense, then it's a lot of wasted effort going into this far-out idea. But if this idea is correct, it is a fantastic upheaval in our understanding."
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