"The team proposes that parallel universes really exist, and that they interact. That is, rather than evolving independently, nearby worlds influence one another by a subtle force of repulsion. They show that such an interaction could explain everything that is bizarre about quantum mechanics."
“The idea of parallel universes in quantum mechanics has been around since 1957,” says Professor Wiseman.
In the well-known “Many-Worlds Interpretation”, each universe branches into a bunch of new universes every time a quantum measurement is made. All possibilities are therefore realised – in some universes the dinosaur-killing asteroid missed Earth. In others, Australia was colonised by the Portuguese."
"Professor Wiseman and his colleagues propose that:
• The universe we experience is just one of a gigantic number of worlds. Some are almost identical to ours while most are very different;
• All of these worlds are equally real, exist continuously through time, and possess precisely defined properties;
• All quantum phenomena arise from a universal force of repulsion between ‘nearby’ (i.e. similar) worlds, which tends to make them more dissimilar."
I read through parts of it but don't ask me to explain anything. It just all looks very exciting!
Multiverses mean endless potential – somewhere out there in distant universes we could all have multiple histories. Maybe there are infinite consequences to one decision, or maybe there are real utopias where there is true socio-economic-political-gender equality. Parallel worlds suggest that perhaps we can all have multiple "truths" and histories floating out there and they are all equally valid, and one world is not necessarily "better" than another.