>>no objective physical reality is…the best conclusion that one can draw given strict adherence to what the mathematical formalism of QM provides…
Can’t get on board with that. Relational QM/no objective reality is just one viewpoint, and it’s worth noting it’s not consensus.
To clarify he’s not claiming objects don’t exist, just that they don’t have observer independent properties.
It is fun to try and wrap your head around what no objective reality would mean. To grasp what we already have shown to be true about time being relative, the examples around simultaneity are a great wtf demonstration: https://en.wikipedia.org/wiki/Relativity_of_simultaneity
To clarify he’s not claiming objects don’t exist, just that they don’t have observer independent properties. -- that's right!
Isn’t it as likely that we have formulaic illusions like time that suffuse our inability to reach objectivity? And in those paradoxes: change only at Planck speed, motion is illusory, quantum gravity obeys probability as in Darwin, the theoretical observer independent reality exists.
The process of philosophy involves shedding illusions like words, statements, time, space to reach objectivity. A loop quantum gravity philosopher claiming there is no objective reality could just be an observer stuck at a bottleneck (notice he doesn’t call into question illusory attributes the piece relies on like biographical info).
Barbour’s observation, that quantum appears to demand specialization and record keeping at very unique planes (records are geology, fossils, impressions, photographs) hints that observers are what physical reality is, is counterpoint to “there is no objective reality.”
If reality is non trivially about record keeping, then of course there’s an objective reality, the Darwinian outcome is the objective sum of record keeping and the study of their differences.
Is existence an observer independent property?
no, unruh effect
You could say the same about relative existence of the magnetic field in classical electrodynamics.