August 14, 2025Open Access

The Arrow of Time in Quantum Theory

Key Points

The conclusion indicates that the arrow of time is not an absolute feature in quantum mechanics, but may vary based on conditions.
Key evidence suggests that the nature of the radiation field's introduction influences the perceived arrow of time in quantum systems.
This analysis revisits concepts from classical mechanics to assess their application in quantum mechanics, especially in atomic physics.
Implications of this work highlight the importance of non-perturbative methods in understanding temporal directionality in quantum contexts.

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.

The Arrow of Time in Quantum Theory

Key Points

Abstract

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