Hello, I'm new here. This is my first post.
This is a very interesting subject. I have wondered about the acceleration of our cosmic expansion for long, and to me a multiverse is what makes most sense. Surrounding universes pulling with their gravity from all sides. If not anything else, that acceleration could be the evidence we would demand, to accept a multiverse.
Please do not confuse the multiverse with the "quantum many worlds theory", which is completely different and totally unprovable. I see people mixing those up all the time.