Early–Time Dynamics of Physical Time in a Non–Stationary Quantum Vacuum

Preprint. This manuscript is a preprint and has not been peer-reviewed. It is currently under consideration for publication in a peer-reviewed journal. AbstractThe remarkable stability of physical time observed in the present–day Universe stands in sharpcontrast with the extreme dynamical conditions that characterized its earliest cosmological epochs.In this work, we investigate the possibility that physical time exhibited nontrivial dynamics in theearly Universe as a natural consequence of a highly non–stationary quantum vacuum.Within the framework of the Quantum Model of the Universe, physical time is interpreted as anemergent effective parameter determined by the vacuum–metric state. We argue that during epochsdominated by rapid vacuum evolution, phase transitions, and strong curvature, the temporal scalegoverning physical processes need not have been constant. We show that such early–time temporaldynamics can be consistently incorporated without violating general relativity, local causality, orcurrent observational bounds, provided that vacuum relaxation leads to temporal stabilization at latetimes.This framework provides a coherent physical interpretation of early–Universe non–stationaritywhile preserving the observed robustness of physical time in the present epoch. key words: Emergent physical time, vacuum–metric dynamics, quantum vacuum, early Universe, temporal non-stationarity, vacuum relaxation, cosmological stabilization, Quantum Model of the Universe (QMU), effective parameters, general relativity consistency, observational constraints, late-time cosmology