Traditional (old) theory suggests there is only one universe, and that the arrow of time (<-- link) is absolute. Modern theory suggests that among the many equations describing physics ranging from the basics to SR, GR, QED, etc. there is little, if anything, which specifically restricts events from marching in reverse. Put simply, it appears that at least at a microscopic level, events are time-symmetric. As the macroscopic level, however, primarily due to a combination of complexity and random variability, things are not time-symmetric.
On a similar note, modern science suggests multiple, if not nearly infinite universes may exist, each nearly identical to it's nearest inter-universal neighbor, but not exactly so. A similar theory (more Star Tekkian than anything else), call it the "One to Few Alternative Realities" theory (OTF) suggests the only time an alternative universe comes into play is when a factor in one universe somehow affects something in its own past, at which point both the original universe unfolds as it did as if nothing went back while an alternative reality springs forth to account for the going back in time.
The thing is, the OTF theory hinges on the time-symmetry at the macroscopic level. So, is that even possible?



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