I remember the year 1980, but what I remember is due to brain processes
that exist right now. I can only ever probe the present moment, there is
no way to prove that 1980 physically exists or existed (whatever the
past tense is supposed to mean). So, if 1980 exists (existed) it must be
considered to be a parallel world where the people in our memory of that
time really exist (existed). The time evolution operator from that time
to the present can be expanded in a basis where complete sets of
commuting local observables are diagonal. One of the simultaneous
eigenstates is the present world we find ourselves in. So, if we assume
that 1980 is indeed real and the present world which is one particular
component of that same 1980 state written in a different basis, then
it's plausible that all the other MWI parallel worlds of 2019 are
equally real.
Saibal
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