Chen, Eddy Keming (2024) Density Matrix Realism. [Preprint]

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Abstract

Realism about quantum theory naturally leads to realism about the quantum state of the universe. It leaves open whether it is a pure state represented by a wave function, or an impure one represented by a density matrix. I characterize and elaborate on Density Matrix Realism, the thesis that the universal quantum state is objective but can be impure. To clarify the thesis, I compare it with Wave Function Realism, explain the conditions under which they are empirically equivalent, consider two generalizations of Density Matrix Realism, and answer some frequently asked questions. I end by highlighting an implication for scientific realism.

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Item Type:	Preprint
Creators:	Creators Email ORCID Chen, Eddy Keming eddykemingchen@ucsd.edu 0000-0001-5144-0952
Keywords:	empirical equivalence, local indistinguishability, wave function realism, scientific realism, canonical typicality, quantum entanglement, conditional density matrix, reduced density matrix, collapse, Wentaculus, open systems
Subjects:	General Issues > Scientific Metaphysics General Issues > Laws of Nature Specific Sciences > Physics > Quantum Mechanics General Issues > Realism/Anti-realism Specific Sciences > Physics > Statistical Mechanics/Thermodynamics General Issues > Theory/Observation
Depositing User:	Dr. Eddy Keming Chen
Date Deposited:	05 May 2024 08:35
Last Modified:	05 May 2024 08:35
Item ID:	23356
Subjects:	General Issues > Scientific Metaphysics General Issues > Laws of Nature Specific Sciences > Physics > Quantum Mechanics General Issues > Realism/Anti-realism Specific Sciences > Physics > Statistical Mechanics/Thermodynamics General Issues > Theory/Observation
Date:	1 May 2024
URI:	https://philsci-archive.pitt.edu/id/eprint/23356

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• Density Matrix Realism. (deposited 05 May 2024 08:35) [Currently Displayed]
  • Density Matrix Realism. (deposited 03 Nov 2024 12:47)

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