The Arrow of Time in Quantum Theory
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This comment re-examines time reversibility in quantum mechanics and concludes that the existence of an arrow of time depends on non-perturbative introduction of the radiation field.
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Abstract
In Classical Mechanics, time is reversible, i.e. implies no particular choice: only the observer knows in which direction it flows. The present Comment re-examines whether this remains true in Quantum Mechanics. In the context of Atomic Physics, it is concluded that the existence of an arrow of time depends on the manner in which the radiation field is introduced, which must be non-perturbative.
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- europepmc
- last seen: 2026-05-20T01:45:00.602351+00:00