The preferred pointer basis is determined by interaction Hamiltonians, not by pre-existing classical paths, so decoherence constitutively shapes rather than merely disrupts trajectories.

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Key Terms

Classical paths(physics philosophy): The everyday trajectories that objects follow, like the arc of a thrown ball; in classical physics, we can predict exact paths, unlike in the quantum world.
Constitutively shapes(as used in metaphysics and philosophy of action): Means to be a fundamental part of creating or forming something, rather than just influencing it from the outside.
Interaction Hamiltonians(quantum mechanics): Mathematical descriptions of how quantum systems exchange energy or influence each other; a Hamiltonian is basically a recipe for calculating how a system evolves over time.
Pointer basis(quantum mechanics and decoherence): The set of possible outcomes or 'positions' that a quantum system can be measured as having; think of it as the menu of answers a quantum particle can give when you ask 'where are you?'

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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.

The preferred pointer basis is determined by interaction Hamiltonians, not by pre-existing classical paths, so decoherence constitutively shapes rather than merely disrupts trajectories.

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