[Zeneta]

All is physical. We’re simply not yet ready to know much about the various physics of worlds.

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All physical?

Why is there the need to introduce concepts that can not be proven by “physical” methods ?

[familyop]

"Why is there the need to introduce concepts that can not be proven by “physical” methods ?"

Material interactions in this universe can be proven in some ways related to our senses and with math. The existence of other universes can be proven despite lacks of means to prove material interactions in those universes. Information behind some of the links in a previous comment offer much better explanations. I'm not a physicist, but I enjoy reading their attempts to explain to us. ;-)