Particles traveling back in time

[nitsuj]

The only way it could happen would be that you traveled back in time and ended up in that part of the multi universe where you traveled back in time.

Can you answer to yourself what that quote of your means?

 

[remmeler]

To Nitsuj - There is a theory that every alternative has happened in a unlimited amount of universes in a multi universe. I will have to look it up, but the theory is there are duplicates of everyone having taken every decision.

I don't say I subscribe to this theory but it is one of the theories out there that has some professional credence. I may not be describing it exactly. But if you are curious, I will look it up.

 

[remmeler]

To Nitsuj - I did not yet go back to my original source but I did find this which seems a close approximation of what I had seen described.

Many-worlds interpretation of quantum mechanics

Hugh Everett's many-worlds interpretation (MWI) is one of several mainstream interpretations of quantum mechanics. In brief, one aspect of quantum mechanics is that certain observations cannot be predicted absolutely. Instead, there is a range of possible observations, each with a different probability. According to the MWI, each of these possible observations corresponds to a different universe. Suppose a die is thrown that contains six sides and that the numeric result of the throw corresponds to a quantum mechanics observable. All six possible ways the die can fall correspond to six different universes. (More correctly, in MWI there is only a single universe but after the "split" into "many worlds" these cannot in general interact.) Tegmark argues that a level III multiverse does not contain more possibilities in the Hubble volume than a level I-II multiverse. In effect, all the different "worlds" created by "splits" in a level III multiverse with the same physical constants can be found in some Hubble volume in a level I multiverse. Tegmark writes that "The only difference between Level I and Level III is where your doppelgängers reside. In Level I they live elsewhere in good old three-dimensional space. In Level III they live on another quantum branch in infinite-dimensional Hilbert space." Similarly, all level II bubble universes with different physical constants can in effect be found as "worlds" created by "splits" at the moment of spontaneous symmetry breaking in a level III multiverse.

Related to the many-worlds idea are Richard Feynman's multiple histories interpretation and H. Dieter Zeh's many-minds interpretation