Sean Carroll has a new paper out defending the Multiverse and attacking the naive Popperazi, entitled Beyond Falsifiability: Normal Science in a Multiverse. He also has a Beyond Falsifiability blog post here.
Much of the problem with the paper and blog post is that Carroll is arguing against a straw man, while ignoring the serious arguments about the problems with multiverse research.
the problem with the multiverse is that it’s an empty idea, predicting nothing. It is functioning not as what we would like from science, a testable explanation, but as an untestable excuse for not being able to predict anything. In defense of empty multiverse theorizing, Carroll wants to downplay the role of any conventional testability criterion in our understanding of what is science and what isn’t.More.
Downplaying testability is the whole point of postmodernism. Who is to judge?
And the multiverse is postmodern physics. Wait till it meets up with postmodern (algebra is racist) math.
See also: The multiverse is science’s assisted suicide