Structural Differentiation Gravity (SDG) proposes that gravity arises from gradients in structural density rather than a fundamental interaction. In this work (v1. 5), irreversibility is introduced through a structural entropy SC (t), which evolves monotonically and defines the arrow of time. Within this framework, time is not treated as a fundamental background parameter but as the ordered progression of structural differentiation. We demonstrate that: - structural entropy provides a natural directionality of time- irreversible propagation emerges from structural evolution- chirp-like signals and wave-like behavior arise naturally- structurally generated signals can closely mimic GR-like waveforms These results highlight that observational signals alone may not uniquely determine the underlying physical model. In particular, irreversibility is shown to be structural rather than statistical, emerging directly from the evolution of configuration itself. This work provides a minimal dynamical extension of SDG and suggests that gravity, time, and wave phenomena may be unified as manifestations of structural evolution. --- Time does not flow — structure differentiates irreversibly.
Koji Okino (Tue,) studied this question.