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    If classicality emerges from quantum mechanics via decohe... — Carmelics
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    Challenges→If the gravitational field remained classical while coupled to quantum matter, one could violate the uncertainty relations.

    If classicality emerges from quantum mechanics via decoherence (Zurek, Joos), a 'classical' gravitational field is already an approximation that cannot carry the precision required to violate uncertainty relations.

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    Key Terms

    Approximation(as used in physics and mathematics)
    A simplified version of something that is close enough to reality for practical purposes, but not perfectly exact.
    Classical gravitational field(as used in physics and philosophy of physics)
    The way gravity works according to Newton's old theory—thinking of gravity as a smooth, continuous force rather than as individual particles or quantum packets.
    Classicality(as used in physics philosophy)
    The property of behaving like everyday objects we can see and predict—following the classical (non-quantum) rules of physics.
    Quantum mechanics(the scientific framework being discussed)
    The science of how the tiniest things in the universe (atoms, electrons, photons) behave—which turns out to work very differently than everyday objects.

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    Uncertainty relations(as used in physics and philosophy of science)
    Rules in quantum physics stating that you cannot know certain pairs of properties (like a particle's position and speed) with perfect precision at the same time—the more accurately you measure one, the less you can know about the other.
    Zurek, Joos(as cited physicists)
    Wojciech Zurek and Erich Joos are physicists who developed the modern theory of decoherence, explaining how the quantum world becomes the 'normal' classical world we observe.
    decoherence(Used to describe why macroscopic superpositions are not directly observed, and assessed here for whether it resolves the measurement problem.)
    A quantum mechanical process in which differently localised states of a measuring apparatus couple to different states of the surrounding environment, entangling the composite system and suppressing interference between branches.

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