Colm Kelleher and George Knapp present that theory, first in their chapter 29 "Other Worlds", and they insist on it in their epilogue. To make it short, let's say that it is probably the strangest theory, and the hardest to swallow, ever conceived in the history of modern physics. It was first proposed by Hugh Everett and John Wheeler in 1957 and it postulates that, according to quantum mechanics, quoting one of the present promoters of the theory, Max Tegmark, in Scientific American (May 2003): "random quantum processes cause the universe to branch into multiple copies, one for each possible outcome". The result, would be that there exist an infinite number of parallel universes, some of which could differ from ours by minute details, like in science-fiction stories such as the TV series Sliders and Stargate! One of the many questions raised by this fantastic theory is whether it is possible to go from one parallel universe to another. Again, through "wormholes", presumably!
In their epilogue, Kelleher and Knapp claim that this theory, which was at first highly controversial, is now approved by a majority of physicists: "This concept is known as the multiverse or many worlds theory, and it has gained widespread acceptance in scientific circles" (p. 276). They cite the above mentioned article of Max Tegmark in Scientific American, and other reputed physicists such as David Deutsch (in his book The Fabric of Reality), and Michio Kaku. True enough, Kaku seems to approve it in his book Visions: How Science will revolutionize the 21st Century (1997).
But, actually, a number of other scientists seem reticent about it, notably the promoters of the famous "superstrings theory", which attemps to reunite the two pilars of physics. One of them is the young physicist Brian Greene, who has written two brillant books on these theories, The Elegant Universe in 1999, and The Fabric of Cosmos (2004). To him, there may be other solutions, more "economical", so to speak, to this paradox of quantum physics. For, instance the theory of the British physicist David Bohm, of "non local physics". To him, there is no theory favored by a majority of scientists today, and the problem remains unsolved (p. 254 of the French edition). In addition to that, there is also a place for parallel worlds in the string theories!
That theory of "strings", or superstrings", is actually a family of several theories, with an already long history since the sixties. To make it short again, lets's mention the most recent stage of its evolution, which has been formulated mainly by Edward Witten, at Princeton, and is called the "M", theory. According to it, the universe is made of eleven dimensions, but we do live in a three dimensional space (four dimensions with time), called a "Brane" which is a diminutive of "membrane". However, there may be another Brane, or parallel world, which would never touch us but could be very close to us! It would manifest itself only by gravitanional effects. It might explain the mystery of missing matter, or "dark energy", which is one of the big mysteries of today's astronomy. And, here we go again, according to some, it might be posible to go from one membrane to another, passing by an hyperspace of ten dimensions, called this time the "bulk". Note that, in this theory, the two parallel membranes are flat. Incidentally, it would allow for time travelling as well, according to Heinrich Päs, quoted in the New Scientist (20 may 2006).
According to Brian Greene and others, there are still other developments to expect for these theories, for instance the "Quantum Loop gravity", and maybe new ones that we have not heard yet about, so that the situation seems to be very open. As for our nagging question of interdimensional UFOs and related phenomena, the bottom line seems to be, for the time being, that we don't know yet, really, how they come and go!…
That being said, the other nagging question is: "who are the authors of these strange phenomena, and what is their "agenda"? As I said, Kelleher and Knapp present some ideas which all tend to put aside the extraterrestrial hypothesis.
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