Saturation Gravity: A Conceptual and Interpretative Framework within General Relativity

This preprint presents the conceptual and interpretative foundations of Saturation Gravity, a framework in which gravitational phenomena are described in terms of a universal saturation mechanism rooted in vacuum physics. Saturation Gravity does not propose modifications to General Relativity. Instead, it offers an interpretative explanation for why the standard relativistic description remains finite in extreme regimes, by introducing a formally imaginary, electric-field–like quantity whose accumulated magnitude reproduces gravitational time dilation. A characteristic saturation scale naturally emerges within this framework and is shown to be numerically coincident with the Schwinger critical field known from quantum electrodynamics. This coincidence is interpreted as a shared vacuum stability scale rather than a dynamical identification of gravitational and electromagnetic fields. The work is speculative and intended as a framework-level contribution. Quantitative applications, observational analyses, and potential phenomenological implications are deferred to subsequent papers. The preprint is shared for discussion and critical evaluation.