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This study establishes that causality in higher-order quantum systems is not an external constraint but a natural consequence of maintaining complete thermodynamic equilibrium. By linking energy balance directly to the temporal sequence of events, the research reveals how fundamental laws of thermodynamics dictate physically plausible transformations without imposing artificial rules. This finding deepens our understanding of the intrinsic relationship between time's arrow and quantum stability.
Researchers Link Quantum Equilibrium with Causality

Until now, defining thermodynamic balance within complex quantum processes has been akin to navigating a maze with shifting walls. This work demonstrates that rigorously enforcing complete equilibrium uniquely determines which transformations are physically plausible, specifically, those obeying a clear cause-and-effect sequence. Consequently, causality itself emerges not as an imposed rule, but as a natural outcome of seeking thermodynamic stability.
Thermodynamic principles dictate the direction of time at the quantum level. Insisting upon complete preservation of thermodynamic equilibrium uniquely determines physically plausible, causally ordered transformations. Maintaining equilibrium isn’t about stable states; it fundamentally establishes which events can cause others in higher-order quantum systems. Maintaining complete thermodynamic equilibrium uniquely defines how events unfold within complex quantum systems and dictates their temporal sequence. Cause and effect aren’t applied to these systems but instead arise…
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