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I show explicitly how concerns about wave function collapse and ontology canbe decoupled from the bulk of technical analysis necessary to recoverlocalized, approximately Newtonian trajectories from quantum theory. In doingso, I demonstrate that the account of classical behavior provided bydecoherence theory can be straightforwardly tailored to give accounts ofclassical behavior on multiple interpretations of quantum theory, including theEverett, de Broglie-Bohm and GRW interpretations. I further show that thisinterpretation-neutral, decoherence-based account conforms to a general view ofinter-theoretic reduction in physics that I have elaborated elsewhere, whichdiffers from the oversimplified picture that treats reduction as a matter ofsimply taking limits. This interpretation-neutral account rests on a generalthree-pronged strategy for reduction between quantum and classical theoriesthat combines decoherence, an appropriate form of Ehrenfest's Theorem, and adecoherence-compatible mechanism for collapse. It also incorporates a novelargument as to why branch-relative trajectories should be approximatelyNewtonian, which is based on a little-discussed extension of Ehrenfest'sTheorem to open systems, rather than on the more commonly cited but lessgermane closed-systems version. In the Conclusion, I briefly suggest how thestrategy for quantum-classical reduction described here might be extended toreduction between other classical and quantum theories, including classical andquantum field theory and classical and quantum gravity.

Interpretation Neutrality in the Classical Domain of Quantum Theory