5 Answers

  1. There is not a single direct confirmation of the reality of parallel Universes, but there is one established fact that is sufficient to doubt their existence. This fact is the absence of rotation of our universe, which can be read about here, or popularly from here, or in the original publication PhysRevLett. So far, the results obtained are quite reliable (99%). If later this fact is confirmed with higher reliability, it will indicate that there are no “other Universes”, because the absence of rotation of a free object (Universe) most likely indicates the uniqueness of this object. But this is still just my doubts.

  2. To begin with, I advise you to read my answer, which explains the process of the origin of our Universe from “nothing”, namely from a scalar field by fluctuations.

    The very “scalar field discharges” discussed in the answer occurred chaotically everywhere and everywhere in the original Proto-universe. This means that our particular Big Bang, which led to the formation of our particular universe, is only one discharge, a separate specific bubble of the resulting space, which we call our cosmos. And not just “maybe”, but according to the formulas, billions and billions of other bubbles, other universes, should float around. In each of these universes (already with a small letter), the scalar field fell/discharged a little differently, and therefore the laws of physics in these universes may differ significantly from ours. Stars and galaxies may not have formed there at all, or on the contrary, something could have formed there that we did not even dream of in our wildest fantasies.

    It turns out that around the bubble of our Universe there are bubbles of other universes, which are formed from the fall of the scalar field in those specific places. Somewhere their own small-town big bang is just beginning, and somewhere everything has long since ended, and “between” these universes is just a scalar field in its high energy state. The multiverse becomes like Swiss cheese, where the cheese itself is a scalar field, and the holes in it are myriads and myriads of universes, one of which is ours.

  3. Theories are unlikely. Non-falsifiable hypotheses-yes. You see, some people find it very strange that there can only be one particular observable universe and nothing else. It's too sparse. It is another matter when there is an infinite, in every sense, set of all sorts of things, some of which are universes (objects that we would call so because of the similarity to what we observe), and we with our universe are only a local piece, a special case. It doesn't matter if there are an infinite number of child and parent levels in relation to our universe and/or an infinite number of some independent worlds, and/or an infinite number of different variants of relationships among all things. In particular, we need to take into account that we have a primitive language, a primitive fantasy, and we do not have to be able to understand what “everything”is.

    I assume that you can find all sorts of ontological research on this topic by some philosophers, but they probably won't offer you anything more than what you can think of yourself, unless philosophers are famous for their ability to speak fluently and poetically.

  4. No one knows, and probably won't. It has already been said above that there are only non-falsifiable hypotheses in this regard. But there is no problem here. If we don't have anything to do with anything outside of our universe, then we can make any assumptions about it. Why not assume that there are other universes out there, especially since such an assumption would solve the problem of “fine-tuning” our universe? (Some people will readily remember God at this point, but God in this case can only be deistic, not connected in any way with our world and with all the religious denominations that exist in it and our ideas about Him.)

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