The most revolutionary, beautiful, elegant, and important idea to be advanced in the past two centuries is the idea that reality is made up of more than one universe. By an infinity of parallel universes, in fact. By "parallel universe" I mean universes exactly like ours, containing individuals exactly like each and every one of us. ...The crazy part of this is where is says that many-worlds is a consequence of quantum mechanics. Dyson was one of the creators of quantum field theory, and he says that many-worlds is not even science.
A truly mind-boggling idea, because were it to be true, it would infinitely expand reality. It would expand reality infinity more than the Copernican Revolution ever did, because at most, all that Copernicus did was increase the size of this single universe to infinity. The parallel universes concept proposes to multiply that single infinite Copernican universe an infinite number of times. Actually, an uncountable infinity of times.
... That is, if you accept quantum mechanics — and more than a century of experimental evidence says you have to — then you have to accept the existence of the parallel universes.
Like the Copernican Revolution, the Everettian Revolution will take decades before it is accepted by all educated people, and it will take even longer for the full implications of the existence of an infinite number of parallel universes to be worked out. The quantum computer, invented by the Everettian physicist David Deutsch, is one of the first results of parallel universe thinking.
No, quantum mechanics does not give any mathematical or physical reason to accept parallel universes.
Here is one explanation that is falling out of favor:
Researchers at the Large Hadron Collider have detected one of the rarest particle decays seen in Nature.Supersymmetry was supposed to solve at least five different problems in physics.
The finding deals a significant blow to the theory of physics known as supersymmetry.
Many researchers had hoped the LHC would have confirmed this by now.
Czech string theorist Lubos Motl wrote:
By far the most important argument in favor of supersymmetry is the fact that it seems to be implied by string theory, the only known - and, most likely, the only mathematically possible - consistent unifying theory of fundamental forces including gravity.String theory is dead. Links to other views are here.