Parallel worlds also exist for another reason. Unless God created the
universe right now and will annihilate it right now, the past and the
future exist. We say that the past existed in the past tense and that
the future will exist in the future tense, but we did not invent these
linguistic notions based on the results of rigorous scientific research.
There is no scientific evidence whatsoever for the past and the future
to not be as real as the present.
Even if we start by assuming that only the present moment is real and
make no assumptions a priori about the past or future, then
computationalism implies that the future is real, because the
information about the future and its further time evolution is contained
in the present moment. So, if you run the universe during the present
moment then you are also running the universe at a future moment, as the
two things are related by a unitary transform. In general, the present
contains not just one future but the set of all possible futures as
additional parallel worlds in the form of a superposition.
This is not true for the past, that's an artifact of the assumption that
the present is real. From only this we cannot derive that alternative
pasts that would have led to an alternative present moment are also
real. But it is, of course, very reasonable to make the assumption that
these parallel worlds are also real.
Saibal
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