Egregoros

in quantum physics what is an "observer"

@sun depends on what interpretation you subscribe to.

The fact of the matter is, these "interpretations" of quantum physics are different theories altogether, some predicting different things than others. In the many-worlds theory by Everett, there is no such thing as an observer, but there are entanglement and decoherence. You could say that an "observer" is someone or something entangled with the quantum system that he "observes".

@newt @sun in other words, its all bullshit

@churkia @newt from what I can tell all of it implies that separate particles are all just different views of the same single thing since the big bang