The Missing Boundary in Fundamental Physics: The Principle of Finite Vacuum Capacity

This work introduces the Principle of Finite Vacuum Capacity as a foundational completion of existing physical frameworks rather than a correction of them. The mathematical and conceptual tools developed in general relativity, quantum field theory, and modern information-based approaches are not assumed to be wrong; instead, they are shown to operate on an implicit assumption of unbounded vacuum response that leaves their theoretical map without explicit borders. The principle asserts that the physical vacuum possesses a finite capacity for causal response. This ontological bound supplies the missing delimiting structure required to close otherwise open theoretical constructions. As this capacity is approached, physical response necessarily enters regimes of saturation, impedance, and causal memory, preventing unbounded linear behavior and infinite divergences. Within this perspective, spacetime curvature, quantum fluctuations, renormalization procedures, and holographic information bounds are reinterpreted as consistent manifestations of a single underlying limit, rather than as independent fixes to separate problems. No existing framework is negated; each is completed by the introduction of explicit borders that define where physical response must cease to scale freely. The Principle of Finite Vacuum Capacity introduces no new dynamics and relies on no phenomenological adjustment. Its role is strictly delimitative: to provide the missing borders of the theoretical map on which modern physics already operates. In this view, infinities are not physical predictions, but signals of an incomplete description.