Decompositional equivalence: A fundamental symmetry underlying quantum theory

Chris Fields
Decompositional equivalence is the principle that there is no preferred decomposition of the universe into subsystems. It is shown here, by using a simple thought experiment, that quantum theory follows from decompositional equivalence together with Landauer’s principle. This demonstration raises within physics a question previously left to psychology: how do human – or any – observers identify or agree about what constitutes a “system of interest”? Full text

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