There is no evidence that there are infinite universes and indeed the belief in such a concept absent any evidence beside "nothing says there can't be" by scientific people is a religious belief on the order of there being a god except with less elf honesty.
We have never detected an alternate universe and we don't even have math that makes it probable. It's just a concept. The same way "there's no reason entropy can't run backwards according to the physics" doesn't stop us not having any evidence for backwards running entropy or negative mass or a million other things that might conceivably exist but have no real evidence but sound cool.
We have never detected an alternate universe and we don't even have math that makes it probable. It's just a concept. The same way "there's no reason entropy can't run backwards according to the physics" doesn't stop us not having any evidence for backwards running entropy or negative mass or a million other things that might conceivably exist but have no real evidence but sound cool.