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Physics
Quantum Physics
Quantum Interpretations and Foundations
Quantum Perspectivalism by D.Dieks
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[QUOTE="Fra, post: 6835737, member: 76451"] I need to spend more time to read to extract his unique core points... but the topic is interesting and some quick reflections "Perspectives can also be defined with respect to physical systems instead of agents." -- [URL]https://link.springer.com/article/10.1007/s10701-022-00611-8[/URL] For me I only entertain the concept of "agents" where the agent IS a physical system. So "physical system" and "agent" are not in any way in contrast to me at least. If he means that "agents" that are "humans" or otherwise fictive or imaginary information processsing context that escape the constraints of real process are not useful, then I agree with this viewpoint. "In fact, all single-world probabilistic interpretations of unitary quantum mechanics that pick out definite-valued quantities by an appeal to decoherence or a similar process need this kind of perspectivalism to make sense of situations of the Wigner’s friend type. These interpretations have the same resources as QBism, or Quantum Pragmatism, for handling conceptual puzzles like Wigner’s friend and nonlocality; but they handle such puzzles in a perspectival realist way, without recourse to subjectivism." -- [URL]https://link.springer.com/article/10.1007/s10701-022-00611-8[/URL] The problem is however not solved by saying that the agent is just a physical system (it is), but the problem is that this physical system can only de described from the perspective of another agent. If if there may exists a kind of "realist" description of the set of all agents, that explains their different perspectives in a way consistent with quantum mechanics in it's corroborated domain of small subsystem, the problem is [I]to find this description, [/I]it is easy to end up in a finetuning situation that is out of hand for any agent; in which case we are still in "sin" as the model we have created, can't be represented by a real agent. And approximations of this description for any given agent will be an effective theory only. So what have be we gained in understanding?? If this is so, then it's this more or less the standard view of decoherence (rephrased perhaps but still) etc??? Perhaps I missed some details, but this is my quick impression of the authors view from skimming. /Fredrik [/QUOTE]
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Quantum Perspectivalism by D.Dieks
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