Abstract
The property of fundamental mechanical theories which allows one to treat compound objects as particles under suitable conditions is considered. It is argued that such a property, called composition invariance, is a nonreleasable property of any fundamental mechanical theory. The proof that standard quantum mechanics enjoys composition invariance is reviewed. Finally, it is shown that the requirement of composition invariance allows one to choose between two alternative forms of quantum mechanics with spontaneous localization.
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Rimini, A. Compound objects as particles in quantum mechanics. Found Phys 27, 1689–1699 (1997). https://doi.org/10.1007/BF02551445
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DOI: https://doi.org/10.1007/BF02551445