According to Superstring Theory (known less formally as string theory), the fifth and sixth dimensions are where the notion (概念) of possible worlds arises. If we could see on through to the fifth dimension, we would see a world slightly different from our own that would give us a means of measuring the similarity and differences between our world and other possible ones.
In the sixth, we would see a plane of possible worlds, where we could compare and position all the possible universes that start with the same initial conditions as this one (i.e. the Big Bang). In theory, if you could master the fifth and sixth dimension, you could travel back in time or go to different futures.
String theory, in particle physics, a theory that attempts to merge quantum mechanics with Albert Einstein’s general theory of relativity. The name string theory comes from the modeling of subatomic particles as tiny one-dimensional “string-like” entities rather than the more conventional approach in which they are modeled as zero-dimensional point particles. The theory envisions (想像) that a string undergoing a particular mode of vibration corresponds to a particle with definite properties such as mass and charge.
In the 1980s, physicists realized that string theory had the potential to incorporate all four of nature’s forces—gravity, electromagnetism, strong force, and weak force—and all types of matter in a single quantum mechanical framework, suggesting that it might be the long-sought unified field theory. While string theory is still a vibrant area of research that is undergoing rapid development, it remains primarily a mathematical construct because it has yet to make contact with experimental observations.
https://phys.org/news/2014-12-universe-dimensions.html
https://www.britannica.com/science/string-theory
image: http://www.planetary.org/blogs/mat-kaplan/20141109-interstellar-the-movie.html
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