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    Friday, December 29, 2017

    Is there a parallel universe with other variants of our life?

    In short, theoretically yes, there is.

    And if in more detail, if we proceed from the current state of theoretical physics, then the parallel universe is not one, their infinite set. This idea is called the Multiverse (as an anonymous English UNIverse). And there are quite a few varieties of this set, with different names: the quantum multiverse (this is the very multi-world interpretation), inflationary, abusive (coming from string theory), holographic, patchwork, landscape and cyclic. But all this, of course, is a pure theory: it has not yet been possible to prove the existence of at least one of these Multiverse. And - yes, as the first commentator (ANDREY KRASNIKOV) already said, the quantum multiverse (a multi-world interpretation of quantum mechanics) is more suitable for your question. I'll tell you more about this.

    At the beginning of the 20th century, a branch of physics was developed, such as quantum mechanics, which studies the behavior of atoms and elementary particles at the micro level. And, only appeared, this quantum mechanics began to amaze scientists with completely illogical phenomena occurring in the microworld: for example, it is impossible to say exactly where and in what state the electron is at the moment: before measurement it is simultaneously everywhere and in all states and at the same time time in none of them. This phenomenon is called superposition. However, when we begin to measure this electron, it instantly (but accidentally) takes one particular position, it turns out in one particular place.

    The scientists tried to explain this somehow, and the Schroedinger equation appeared, due to which it was possible to describe the probability of the electron position before the measurement (that is, for example, with the probability of 33.8% the electron will be here, with a probability of 17.5 % here it is, and so on). Specifically, the Schrödinger equation describes the wave function of the position of a particle (in this case an electron) at a given point in space with a certain probability. So that's it. In 1927, the physicists Niels Bohr and Werner Heisenberg developed the so-called "Copenhagen interpretation", according to which the collapse of this very wave function occurs in the measurement, of all probabilities one is selected and the electron is in one particular place.

    And in the middle of the 20th century, the American physicist Hugh Everett advanced his idea of ​​what happens to a particle during a measurement. According to this idea, which was later called the "multi-world interpretation" of quantum mechanics, there is no collapse of the wave function, all probabilities are realized, but each in a separate universe. Thus, if we imagine a hypothetical physicist who discovered an electron here, then exactly the same hypothetical physicist, but in another universe, discovered an electron there. Thus, new parallel universes appear constantly, and there is no number for them. Hence the conclusion that theoretically yes, parallel Universes, where we made a different decision, exist. In one of them you are a millionaire, in another - a poor homeless person, in the third - an ordinary average person, not different from others, and so on.
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