The laws of physics behave symmetrically under time reversal
Fundamental physical laws are generally symmetric under time reversal, a principle foundational to microscopic physics, quantum mechanics, and conservation laws.
The retrieved papers consistently treat time-reversal invariance or symmetry as a standard foundational property of physical laws (e.g., in quantum mechanics, electrodynamics, and microscopic processes), while discussing how macroscopic irreversibility or specific symmetry-breaking arises in open or dissipative systems. The evidence strongly supports the claim that the laws of physics are fundamentally time-reversal symmetric.
M. Silveirinha. Hidden time-reversal symmetry in dissipative reciprocal systems.. 2019. https://doi.org/10.1364/OE.27.014328
Paper 0 notes that reciprocity in systems is fundamentally justified by time-reversal symmetry in physical laws.
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Reza Moulavi Ardakani. Time Reversal Invariance in Quantum Mechanics. 2017
Paper 2 discusses how physical systems are time-reversal invariant when their underlying laws are not sensitive to the direction of time.
Hsiang-Shun Chou. The missing piece of the jigsaw puzzle: probability conservation as a consequence of time-reversal symmetry. 2019. https://doi.org/10.1088/1361-6404/ab2d62
Paper 6 examines the time-reversal invariance and covariance of the Schrödinger equation as a basic physical requirement.
Gavriel Lerner, Matan Even Tzur, O. Neufeld, Avner Fleischer, Oren Cohen. Reflection parity and space-time parity photonic conservation laws in parametric nonlinear optics. 2024. https://doi.org/10.1103/physrevresearch.6.l042034
Paper 7 discusses space-time reversal symmetry in the context of physical conservation laws.
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