Nothing has been revealed in God’s revelation or science that would support such a theory. It’s basically just an fanciful idea or imagination someone had based on the “anythings possible” school of thought.
… and yet nothing in God’s revelation, that I know of in the Magisterium of the Church, has precluded that a multiverse exists either, just because it’s not stated directly in scripture doesn’t mean it doesn’t exist, how many events and actions of Christ are not recorded in the Bible and yet the happened (John 20: 30 and John 21:25). To me, this is like saying, “because uranium wasn’t revealed in scripture or by Church Tradition; therefore, it doesn’t exist” a statement that we could easily disprove with science (please read on, this is only part of the concept I’m working on here).
Who’s to say that Science is NOT revealing what God has made when it comes to the concept of Multiverse?
As for Science, in a general sense, in that a theory is a hypothesis that can be tested and retested, you may have a point, (
Smithsonian.com - Can Physicists Ever Prove the Multiverse Is Real? Astronomers are arguing about whether they can trust this untested—and potentially untestable—idea (link) ) - in the strictest definition of the word. Let us not forget, theories are based upon hypotheses which are in turn based upon a question about something that is observable, either physically or by inference of other theories. It was an observed behavior of the Universe that prompted the question about the multiverse in an effort to explain that which we observed - in this case the theory of
Cosmic Inflation which has basically replaced the
Big Bang theory in many academic circles (you might want to go get a large pot of coffee for this article
alumni.stanford.edu/get/page/magazine/article/?article_id=32024.
In anycase, some in the physics world are saying that there is now hard evidence, other’s are debunking it; thus, to make the blanket statement that “
nothing in science” has been revealed to support such a theory is may be an over-reach. In Science, we run into the same wall with the multiverse as we run into when using Science to examine God in that both, multiverses in general and God, are outside of our Universe, which by definition, is what our current Science is limited to studying. We can however, make inferences, and as such, just because we don’t fully understand, doesn’t mean it doesn’t exist.