Gravitational Time-Stacking (GTS): Delayed Superposition of Spacetime as a Non-Particulate Alternative to Dark Matter

For decades, the ΛCDM framework has relied on the dark matter hypothesis to explain galactic rotation curves and mass discrepancies in galaxy clusters. Despite extensive experimental effort, no universally accepted non-baryonic particle candidate has yet been confirmed. In this work, we propose the Gravitational Time-Stacking (GTS) hypothesis as a phenomenological alternative to particulate dark matter models. The central premise is that spacetime may exhibit a limited viscoelastic response, such that curvature generated by moving baryonic matter is not fully instantaneous but instead includes a small temporally integrated component. Under this hypothesis, some features commonly attributed to dark matter halos may be reinterpreted as a cumulative geometric memory of the baryonic mass distribution. We introduce a density-dependent screening function to suppress the effect in high-density environments, thereby preserving standard General Relativity in regimes where it is already strongly tested. The model is presented as a preliminary theoretical framework intended for qualitative study and future numerical testing, rather than as a completed fit to observational data.