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  1. Density Matrix Realism.Eddy Keming Chen - 2024 - In Michael E. Cuffaro & Stephan Hartmann (eds.), Open Systems: Physics, Metaphysics, and Methodology (2025: Oxford University Press). Oxford: Oxford University Press.
    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 (mixed) 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 (...)
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  • Finding Time for Wheeler-DeWitt Cosmology.Nick Huggett & Karim Thebault - manuscript
    We conduct a case study analysis of a proposal for the emergence of time based upon the approximate derivation of three grades of temporal structure within an explicit quantum cosmological model which obeys a Wheeler-DeWitt type equation without an extrinsic time parameter. Our main focus will be issues regarding the consistency of the approximations and derivations in question. Our conclusion is that the model provides a self-consistent account of the emergence of chronordinal, chronometric and chronodirected structure. Residual concerns relate to (...)
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