First of all, assuming that each of us has vision that can observe distant planets like the Hubble Space Telescope (easy to observe), at time A of the earth, I observed a little boy eating fried rice cakes on the z planet 30 light-years away from the earth , but in fact, if the earth time is used as the standard time of the universe, I observed that the boy was actually an uncle in his 30s at the moment A when he was eating fried rice cakes.
But for me on Earth, the little boy lives in the same universe as me, and the uncle lives in the future universe. If at this time, the uncle moves to me instantaneously through the "wormhole", I will be able to observe these two worlds at the same time, and the uncle can also observe his past self through the telescope (is it a real existence, or is it transmitted through light) image?)
ok, at this time, the uncle should really live in the four-dimensional space by means of "wormhole" or time travel?
However, it is not. The above-mentioned four-dimensional space exists only in "observation". That is to say, it is just a "delay phenomenon" of light propagation. Suppose that in the three-dimensional world, the little boy I observed on a planet 30 light-years away was actually an uncle in his 30s, and the little boy I observed was just the "image data" of the uncle's past. If the uncle teleports from his planet to me at this moment, the uncle can also observe the "image or state" of his childhood, but the boy and the uncle will never meet. Meeting or dialogue is impossible, at least under the premise of a universe. The above-mentioned observational experiments can be completely explained by the optical theory of the three-dimensional world without involving higher-dimensional knowledge, so it is impossible to demonstrate the four-dimensional space from this.
It's as if I hear several echoes of myself, it's just a sound delay and reflection, not that I hear sounds from different dimensional worlds.
Therefore, only the theory of parallel universes can be introduced. In other universes, there are many boys eating fried rice cakes or something. And I just observed the little boy in the same universe as me, the uncle is always 30 years older than what I see, all the things that can be observed are "images with different degrees of delay", but this phenomenon has nothing to do with parallel universes .
Why are there so many parallel universes? Schrödinger's cat experiment, why does the experimental result depend on "observation"? "Observation" itself is an act without any energy. After the observation, does the parallel world of the cat "collapse"? Why is there a causal link between observation and collapse?
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