[oceanghost]

Science is just a tool to make predictions. We cannot test the multiverse theory, which leaves it in the realm of philosophy or religion.

This idea of a multiverse is some metaphysics sprinkled in with the Copenhagen interpretation that boils down to something like this: the total probability of any observed outcome summed with the probability of all possible outcomes is, of course, one.

The metaphysics is this-- assuming that all the outcomes that did not occur did occur in some other unobservable and inaccessible universes.

This is essentially the meaning of the plus symbol in summing probabilities; it separates the observed wavefunction from every other possible wavefunction. It is absurd to draw such a mind-boggling conclusion from a plus sign.

[tim333]

To me science is more than a tool to make predictions - it's a way of trying to figure out what's going on using experiment, reason and the like. Maybe there are multiple universes or not and maybe we'll be able to test it or not. Who knows, reality is what it is.

[oceanghost]

That's called scientism, and its often conflated with science.

Just because a theory makes correct predictions, does not mean, necessarily that those mechanisms exist in the actual physical universe. It is entirely possible to make correct predictions with incorrect models.