Strange thread. What's this got to do with us? Has someone here championed alternate universes as fact? I don't think so. The multiverse idea has been around for a long time, mostly as speculation. It was definitely a fringe idea although recently it has become mainstream. It's still mostly hypothesis at this stage of the game. And you're wrong about there being no possibility of detecting them. I can't say whether or not the Planck data is actual evidence but M theory (Google it) predicts that gravity is not confined to the universe with the mass that generated it. So you're full of shit anyway.
Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.
Albert Einstein
Albert Einstein