Tracing out a heavy field can appear to decohere a light field, but the apparent decoherence is an artifact of the chosen bipartition; the energy-based EFT projection preserves purity.
Introduction to Effective Field Theory,
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Does decoherence violate decoupling?
Tracing out a heavy field can appear to decohere a light field, but the apparent decoherence is an artifact of the chosen bipartition; the energy-based EFT projection preserves purity.