An Effective-Field Framework for Engineered Vacuum-Mode Coupling Under Semiclassical Gravity Constraints

Abstract We present a speculative semiclassical framework for engineered vacuum-mode coupling in resonant electromagnetic systems. A scalar coupling field, denoted Ψ, is introduced as an effective phenomenological parameter linking renormalized vacuum stress-energy contributions (Casimir configurations, squeezed-vacuum states, and resonant metamaterial structures) to weak-field spacetime perturbations. The framework does not claim reactionless propulsion, macroscopic antigravity, or controllable spacetime engineering. Instead, it proposes a falsifiable effective-field model forinvestigating whether engineered resonant vacuum structures could generate measurable stress-energy perturbations under tightly constrained laboratory conditions. A weak-field coupling formalism is developed, together with a stability architecture forbounding resonance-source divergence. Experimental pathways involving interferometry, torsion balances, and resonant cavity measurements are outlined. A quantitative comparison against Ford–Roman quantum inequality bounds shows that any physically realizable coupling is expected to produce effects approximately 15 orders of magnitude below current detection thresholds. All predicted effects therefore remain speculative and are expected to be extremely small pending future theoretical refinement and experimental validation.