>>12254760Pretty spot on except for one thing: QM is "perspectival". GR is relative.
Different GR observers can still agree on an objective fact about the state of spacetime (thanks to Lorentz transformation).
Different QM observers CANNOT agree on an objective fact about eigenstates.
There are two possible reasons for the inconsistency:
one, we just haven't figured out the QM version of a Lorentz transformation.
two, the scale difference makes the disagreement among observers fundamental. think: we look "down" onto the QM world, while the GR world looks "down" on us.
odds are on #2 (wigner's friend experiments).
>>12255016you have this backwards!
the timelines where you die out are the ones that remain in superposition since wavefunction collapse requires measurement.
while it's true that the mortal versions of "you" do collapse the wavefunction, it's only a temporary collapse.
this is important because of what the quantum eraser experiment shows: an erasure of a measurement rewrites the past such that the photon was as if it was in superposition all along!
your death in timeline #...4883 is exactly the erasure of that timeline's measurement, so it is as if it has always been superposition!
the only your-timeline that can remain out of superposition (and thus never get reverted back) is the one where you perform the measurement forever without end; ie: immortality.
I think it should make intuitive sense that only one of "you" can survive forever, though we can discuss this if not. In fact, only one observer, period, can survive forever, not just only one of you. This is soft solipsism since it implies that everyone else is a probabilistic zombie (their ontologies exist in superposition, ie not in an eigenstate). Their only eigenstate is the one the immortal observer grants them :(
In the next 10 years, we'll have a physicis experiment to prove all this, and to determine who this immortal observer is who grants all of us a measured/tangible existence.
