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horrorfictionwriter ig part of physics is theorising possibilities and, based on evidence, probabilities.
I can acknowledge that the advanced mathematical theorems can guess at ways in which other dimensions might exist - but, as yet, there is no way to construct an experiment that could prove it. Perhaps one day the means might be invented, if this round of evolution manages to survive climate change.
But if you think about it carefully, according to the evidence discovered by physicists and astronomers, space and time begin, end and depend on the existence of matter.
Without matter, time and space cannot exist. They are inseparable. We are made of matter.
Therefore we can only exist in time and space.