Did Oxford scientists mathematically prove parallel universes?
The article doesn’t say that there is proof of parallel universes, only that the many worlds interpretation is mathematically equivalent to the Copenhagen interpretation. I think the article is just plain wrong in saying this has any implications for time travel. In my mind the many worlds interpretation and the Copenhagen interpretation are both about what actually happens in the forward flow of time – does a probability wave collapse to a single value, or do universes split off? Just when I thought quantum interpretations couldn’t get any stranger, I found this: http://www.analogsf.com/0410/altview2.shtml It says that a recent experiment, the Afshar_experiment, may disprove both Copenhagen and many worlds interpretations. I don’t know what I think about this yet. I don’t think it actually contradicts the many worlds interpretation, at least not as I have interpreted it.