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"And in each universe, there's a copy of you witnessing one or the other outcome, thinking - incorrectly - that your reality is the only reality," Greene wrote in "The Hidden Reality." For example, if you reach a crossroads where you can go right or left, the present universe gives rise to two daughter universes: one in which you go right, and one in which you go left. And the mathematics of this theory might suggest that all possible outcomes of a situation do occur - in their own separate universes.
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Quantum mechanics describes the world in terms of probabilities, rather than definite outcomes. The theory of quantum mechanics, which reigns over the tiny world of subatomic particles, suggests another way multiple universes might arise. Sometimes, they might slam into each other, causing repeated Big Bangs that reset the universes over and over again. (Image credit: Sandy MacKenzie Shutterstock)Ĭolumbia University physicist Brian Greene describes the idea as the notion that "our universe is one of potentially numerous 'slabs' floating in a higher-dimensional space, much like a slice of bread within a grander cosmic loaf," in his book "The Hidden Reality" (Vintage Books, 2011).Ī further wrinkle on this theory suggests these brane universes aren't always parallel and out of reach. Our universe may live in one bubble that is sitting in a network of bubble universes in space. In addition to our own three-dimensional "brane" of space, other three-dimensional branes may float in a higher-dimensional space. The idea comes from the possibility of many more dimensions to our world than the three of space and one of time that we know. And in some of these bubble universes, the laws of physics and fundamental constants might be different than in ours, making some universes strange places indeed.Īnother idea that arises from string theory is the notion of " braneworlds" - parallel universes that hover just out of reach of our own, proposed by Princeton University's Paul Steinhardt and Neil Turok of the Perimeter Institute for Theoretical Physics in Ontario, Canada.
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Thus, our own universe, where inflation has ended, allowing stars and galaxies to form, is but a small bubble in a vast sea of space, some of which is still inflating, that contains many other bubbles like ours. Eternal inflation, first proposed by Tufts University cosmologist Alexander Vilenkin, suggests that some pockets of space stop inflating, while other regions continue to inflate, thus giving rise to many isolated "bubble universes." In addition to the multiple universes created by infinitely extending space-time, other universes could arise from a theory called "eternal inflation." Inflation is the notion that the universe expanded rapidly after the Big Bang, in effect inflating like a balloon.