.... we have met the aliens and they are us….
There have been experiments performed to prove the existence of this thought, the multiverse. An experiment called the double slit experiment devised by Richard Feynman resulted in some rather strange results. I for one do not really know if a bridge can be constructed using high speed particals in a Hadron Collider to create Einstein Rosen Bridges (Worm Holes To The Past). Like you I have pondered this very same question, is time travel possible. I initially said no way for time travel but as I kept reading a unique set of words kept popping up again and again and here is what I am reading...
A growing number of physicists Richard Feynman, N. Ph. Georgiades, E.S.Polzik and H. J. Kimble are convinced that the thing we call ‘the universe’ — namely space, with all the matter and energy it contains — is not the whole of reality. According to quantum theory — the deepest theory known to physics — our universe is only a tiny facet of a larger multiverse, a highly structured continuum containing many universes.
I could easily write some deep explanation with scientific clarity but to answer the hypothesis of cause and effect and tell you that the laws that govern our universe can not be broken, but what if when you go back in time and make a change to the time line the change does not effect your future but rather an alternate future in the multiversity.
Everything in our universe — including you and me, every atom and every galaxy — has counterparts in these other universes. Some counterparts are in the same places as they are in our universe, while others are in different places. Some have different shapes, or are arranged in different ways; some are so different that they are not worth calling counterparts. There are even universes in which a given object in our universe has no counterpart
On large scales, universes obey the laws of classical physics, and so each behaves as though the others were not there. But on microscopic scales, quantum mechanics becomes dominant and the universes are far from independent. Universes that are very alike are close together in the multiversity and affect each other strongly, though only in subtle, indirect ways — a phenomenon known as quantum interference.
Without quantum interference, electrons would spiral into atomic nuclei, destroying every atom literally in a flash. Solid matter would be unstable, and the phenomena of biological evolution and human thought would be impossible. And as I shall explain, it is quantum interference that provides our evidence for the existence of the multiversity.
Through interference, its counterparts in other universes can affect each particle in our universe. What we see as a single subatomic particle is really a sprawling trans-universe structure, spanning a large region of the multiversity. Although we cannot see the parts of this structure that are outside our universe, we can infer their presence from the results of experiments.
As I said scientists are going to experiment with high speed partials at CERN so the rules have not been written yet, we have no unified theory yet. We just do not know what is possible. I for one hope for time travel, can you just imagine knocking on your families door in say 1941 would they believe you came from the future or just call the cops saying you are a madman. No one would ever believe you.
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