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Density Matrix Realism

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:
CreatorsEmailORCID
Chen, Eddy Kemingeddykemingchen@ucsd.edu0000-0001-5144-0952
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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