Standard scientific concept states that we live in a three-dimensional world that is long, wide and high. Sometimes a fourth is added to the three dimensions - time … Meanwhile, there are a variety of theories that "add" dimensions to the universe. Only their authors are mostly not scientists, but authors of science fiction books and films.
Paraspace
This term was coined by the writer Samuel Delaney. He drew attention to the fact that in many fantastic works the heroes leave their "native" world and find themselves in another dimension.
Delaney suggested that paraspace might actually exist. In doing so, it affects our world. When we experience "otherworldly" sensations, see or hear something that does not exist in our reality, these can be echoes of "paraspace", in other words, a parallel world. Although, perhaps, it is also inside our dimension …
Flatland
This is a world of only two dimensions, described in 1884 by the minister and scientist Edwin Abbott in a book he wrote. Its main character is a square. In the world where he lives, the more facets and angles an individual has, the higher his social status.
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In a flat world, there is no sun or stars. Once in a millennium, one of the inhabitants of the three-dimensional world enters Flatland. But the inhabitants of Flatland are not ready to believe in the existence of the third dimension … However, Abbott's work is more a satire on Victorian England than a science fiction novel.
Super Sargasso Sea
It is described by renowned writer and paranormal researcher Charles Forth. He claims that there is a "special" dimension, where all things that disappear in our world end up. Sometimes they can "return" from there and then reappear … This is how one can explain the phenomenon of rains from animals and inanimate objects that take place in different parts of the globe. By the way, having studied their geography, the Fort came to the conclusion that the "Super-Sargasso Sea" stretches from Great Britain to India.
L-space
This term was coined by the writer Terry Pratchett. L-space is a special dimension that represents a library. But not in the usual sense, but in the sense of the global information field. There you can find any books that have ever been written, that will be written, and, finally, those that were only conceived but never written … Some books can be dangerous, so certain rules must be followed in L-space … Only senior librarians are dedicated to all rules.
Hyperspace
This term is used in many works of science fiction. It means something like a tunnel through which you can travel to other dimensions faster than the speed of light.
For the first time the idea, perhaps, was expressed back in 1634 by Johannes Kepler in the book "Somnium". Her characters must get to an island located 80 thousand kilometers above the ground. Only demons can open the way there, which, with the help of opium, immerse travelers into sleep, and then transport them to their destination using the force of acceleration under their control.
Pockets of the Universe
Massachusetts Institute of Technology physicist Alan Guth has hypothesized cosmic inflation. One of its main ideas is that our Universe is constantly expanding and as it expands, it generates an increasing number of space-time "pockets" - autonomous universes, for each of which its own physical laws operate.
The theory of ten dimensions
This theory, also called superstring theory, does not have three or four dimensions, but much more. At least ten. All of them can affect our world, although we do not see and for the most part do not perceive them.
The fifth dimension exists, as it were, in parallel with ours, this is what we call the "parallel world". The sixth is the plane on which all universes like ours exist. Seventh - these are the worlds that arose under conditions significantly different from ours. The eighth is the dimension where the endless stories of the worlds in the seventh dimension are "stored". In the ninth, there are worlds whose physical laws differ from ours. Finally, the tenth dimension contains all of this taken together. So the human mind is simply not able to imagine more than ten dimensions …