Last couple of months I have enjoyed studying scientific horizons, inspired by excellent books by Brian Green and some other authors (Paul Davies and Victor Stenger). I am sure you will find a way to confirm the following ideas from modern theoretical physics: Multiverse could be (as summarized by Brian Green):
Quilted, Inflationary. Brane. Cyclic, Landscape. Quantum, Holographic, Simulated, Ultimate.
The existence of some of these possible multiverses is a direct consequence of physical theories. Quilted multiverse is based on the very idea of infinite space. Quantum multiverse is the result of strict application of quantum physics (as suggested by less know physicist Hugh Everett). Brane and Landscape multiverses are the result of string theory, and the Holographic multiverse came out from exciting insights into relationship between information, entropy and study of black holes. The last two, Simulated and Ultimate are speculative, but nonetheless, possible.
Ali in all, from the science point of view, the existence of a multiverse is more likely than that of the universe.
The main problem science has with multiverse is – experimental proof. For now, there is no realistic chance that some of these theories, however “hard” they may be, will be proven in the near future. Here is the place where spirituality could come in. If we could, somehow, consciously connect with our doubles out there, than we would be just a step away from the practical evidence of the multiverse.
Spirituality may open the door, which could otherwise forever stay closed for science.
Of course, this is only a possibility. But, I did work on that idea in my book “Before we go too far”. I tried, and succeeded quite nicely, in the form of a novel, to picture out the possible multiverse, the processes going on in it, and our possible multidimensional future.
The trip to the goal starts with the first step. In this case, the first step is an open mind and understanding that our universe is not unique. There are many reasons why we can be quite sure abut the multiverse, and it is only a question of time when todays strange ideas will become practical reality.