Different universes or multiverses form the multiverse and together form a universe in which everything exists and is described by physical laws and constants. In ancient Greek atomism, which proposed an infinite parallel world, born of the collision of atoms, there is a traditional example of such a world in the form of the universe. In 1952 Erwin Schrodinger gave a lecture in Dublin in which he jokingly warned his audience that what he wanted to say might appear untrue and a lunatic. Brian Greene, a physicist at Columbia University, has explained that multiverse theory is still just that: a theory. The idea that there are only numerous other universes floating in space is a bit like imagining a piece of bread floating on a cosmic loaf. Different worlds in all dimensions hover around us, and we all hover in different worlds and dimensions.
Even if you had solid physics to back it up, it is still a random idea that people come up with, even if they have solid evidence to back it up. Theoretical simplicity comes at the expense of multiple universes, but the theory is much cleaner under these conditions, and you can screw it on to reduce the number of universes to one. A better argument for the multiverse is that the idea of multiverses naturally arises from the mathematical models currently used in theoretical physics. The enormous number of galaxies has been proposed by many physicists, from Albert Einstein to Everett Kiely to John Maynard Keynes.
This means that the universe could be a much larger multiverse, containing many, possibly even infinite, universes in many smaller universes. Various theories also suggest that multiverses could be formed in different forms, and that these extra universes could be separated by enormous distances, embedded in another spatial dimension, or separated only by time. There is no scientific basis for any part of multiverse theory, since much of it is hypothetical and imaginary. First, not all scientists agree that there could be multiverses, let alone that they can be explored in any number of different ways, even in the same universe.
There is indeed some evidence that they may help explain certain anomalies in the universe. Multiverse theory (also known as meta – universal theory) is a model that assumes that physical reality encompasses more than one universe and that there are at least one or more universes beyond any other universe. Several types of such multiverses are known in literature, and some models suggest a multiverse with a finite number of universes, while others postulate that we live in multiverse with finite universes. Most of the theories of the multitude universe imply that once we identify a universe, all its macro-states are quite similar, with infinite time intervals in between.
The space of the universe goes far beyond what we can see, and that would mean that there are infinitely many other regions outside our own pocket universe, as regions outside the observable universe, where the laws of physics are the same. What we call Hilbert space, which is infinite – dimensional and abstract – exists in Hilbert spaces of innumerable branching, where several universes are created by the law of quantum mechanics. Other whole worlds are far away, branching out immensely into different types of Hilbert Space, but they are here in a sense. The Big Bang is only the starting point, with the multiverse created by chaotic inflation that led to several universes, including ourselves, separated by unimaginable distances. This means that the light years of the universe that we can observe are expanding and that other universes reside in it. This means that after our Big Bang there is a kind of cosmos, a universe of extravagances that encompasses many more dimensions than in our own universe and many other worlds.
Cosmologists usually study the inflationary version of the multiverse, but this strange scenario may take other forms. The part that we can see, the visible universe, is thus only a collection of other universes of equal size, which are assembled into a multitude universe. Nevertheless, many of the things that cosmologists today confuse about the universe around us can be explained by multiverses, such as the existence of dark matter and dark energy.
Every other newly formed universe takes the form of a physical particle, such as an electron, which has several options at any given time. Physicists use the term “parallel universes” to discuss these different concepts, but sometimes it can get a bit confusing. For example, some physicists firmly believe in the idea of a multi-universe for cosmological purposes and do not really believe in parallel universes, such as the universe in Star Trek or a universe outside our own universe. It is important to recognize that parallel universe is not really a conclusion that comes from the various theories of physics.