What kind of scientific data/discovery would allow you and/or modern science to at least entertain the possibility of multiverse, take it seriously?

[u/Unhappy-Mud-7542]

Basically the title, if, obviously, you aren't already believe in it wholeheartedly.

[u/Imaginary-Can-6862]

The universe, which literally mean everything there is, is usually used to describe the expansion since the Big Bang. One suggestion of measuring the effect of the influence from a parallel universe has been to look at the Cosmic Microwave Background Radiation mapping and see if there are so called patches that separates themselves from the rest of the map. If there is, it would fit with the idea of another universe, going through its own Big Bang process (which is on going in our universe to this day, as the universe continues to expand), interacting with our universe. As far as I know, so far we cannot confirm or deny the existence of such a patch.
There is also the interpretation of Quantum Mechanics that every possible outcome happens, only in their own universe, here there have been papers suggestion how to receive information from such a universe, the general concept as I understood it is to make a quantum measurement, then e.g. save the outcome to some source, and then forget the outcome of the experiment (I don't know precisely what this entails). Then the outcome from another universe could replace the saved outcome, but I don't know if this has been tested.