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Hidden dimensions?
I don’t think that’s a legitimate term in science. There could be dimensions we aren’t aware of yet, or ones that haven’t been defined, but they wouldn’t be “hidden dimensions” necessarily. Out of range maybe. Everything is a derivative of space, which is 1-dimensional. The only thing we don’t know is how far out that line extends. If the universe is a series of waves, and I’m not saying it is or isn’t, with a universe existing within each wave, they wouldn’t be hidden per se, and they most certainly wouldn’t be any different from our own universal wave. To understand one wave is to understand all the others. The universe is a linear problem. There’s only so many things that can occur mathematically within a line. Additional relative universes maybe, but not hidden dimensions. It adds too much mystique to the problems in science. Great for science fiction, but not so great for science. In my humble opinion. We need to focus on the dimensions we can identify within our own universe.