Emergent Thermodynamic Arrow from the Mutual-Causation Structure of the FPF

Establish whether an effective thermodynamic arrow of time emerges from the mutual-causation, event-symmetric structure of the Fixed Point Formulation of quantum mechanics defined on the Keldysh contour.

Background

Within the Fixed Point Formulation, events are modeled as fixed points that act as symmetric sources and sinks along forward and backward branches on the Keldysh contour, embodying a form of all-at-once retrocausality often described as mutual causation.

The author raises the question of whether macroscopic irreversibility—specifically, a thermodynamic arrow of time—can arise effectively from this time-symmetric, retrocausal microstructure.