The actual quantum-mechanical hypothesis of parallel universes is "universes that are separated from each other by a single quantum event."
Fantasy has long borrowed an idea of "another world" from myth , legend and religion. Heaven , Hell , Olympus , and Valhalla are all "alternative universes" different from the familiar material realm. Plato reflected deeply on the parallel realities, resulting in Platonism , in which the upper reality is perfect while the lower earthly reality is an imperfect shadow of the heavenly. The lower reality is similar but with flaws.
While technically incorrect, and looked down upon by hard science-fiction fans and authors, the idea of another " dimension " has become synonymous with the term "parallel universe". The usage is particularly common in movies , television and comic books and much less so in modern prose science fiction. The idea of a parallel world was first introduced in comic books with the publication of The Flash #123, " Flash of Two Worlds ". [ citation needed ]
In written science fiction, "new dimensions" more commonly – and more accurately – refer to additional coordinate axes , beyond the three spatial axes with which we are familiar. By proposing travel along these extra axes, which are not normally perceptible , the traveler can reach worlds that are otherwise unreachable and invisible.
In 1884, Edwin A. Abbott wrote the seminal novel exploring this concept called Flatland: A Romance of Many Dimensions . It describes a world of two dimensions inhabited by living squares, triangles, and circles, called Flatland, as well as Pointland (0 dimensions), Lineland (1 dimension), and Spaceland (three dimensions) and finally posits the possibilities of even greater dimensions. Isaac Asimov, in his foreword to the Signet Classics 1984 edition, described Flatland as "The best introduction one can find into the manner of perceiving dimensions."
Are you unique? In your perception of the world, the answer is simple: you are different than every other person on this planet. But is our universe unique? The concept of multiple realities or parallel universes complicates this answer and challenges what we know about the world and ourselves. One model of potential multiple universes called the Many-Worlds Theory might sound so bizarre and unrealistic that it should be in science fiction movies and not in real life. However, there is no experiment that can irrefutably discredit its validity.
The origin of the parallel universe conjecture is closely connected with introduction of the idea of quantum mechanics in the early 1900s. Quantum mechanics, a branch of physics that studies the infinitesimal world, predicts the behavior of nanoscopic objects. Physicists had difficulties fitting a mathematical model to the behavior of quantum matter because some matter exhibited signs of both particle-like and wave-like movements. For example, the photon, a tiny bundle of light, can travel vertically up and down while moving horizontally forward or backward.
Such behavior starkly contrasts with that of objects visible to the naked eye; everything we see moves like either a wave or a particle. This theory of matter duality has been called the Heisenberg Uncertainty Principle (HUP), which states that the act of observation disturbs quantities like momentum and position.
In relation to quantum mechanics, this observer effect can impact the form – particle or wave – of quantum objects during measurements. Future quantum theories, like Niels Bohr’s Copenhagen interpretation , use HUP to state that an observed object does not retain its dual nature and can only behave in one state.
In 1954, a young student at Princeton University named Hugh Everett proposed a radical supposition that differed from the popular models of quantum mechanics. Everett did not believe that observation causes quantum matter to stop behaving in multiple forms.
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