This paper presents a novel cosmological framework interpreting the vacuum as a system of harmonic oscillators, resonating at relativistic scales and manifesting properties that unify aspects of quantum mechanics and general relativity. By modeling the vacuum through an equivalent RLC circuit, fundamental constants, including the speed of light, gravitational constant, and fine-structure constant, are derived as emergent properties of this oscillatory vacuum structure, revealing a dynamic structure within the vacuum, and linking oscillatory vacuum states to the emergence of gravitational and electromagnetic phenomena.Based on this framework, they are postulated explanations for the cosmological constant, observable gravitational phenomena, and large-scale structure, proposing a resonance-based expansion model of the universe consistent with current cosmological observations. By re-envisioning the vacuum as an active, resonant medium, this model offers a unified theoretical basis that could integrate quantum mechanics, relativity, and cosmology, with implications for both fundamental theory and potential observational validation. Finally, the model further explores energy exchange across a hypothesized matter-antimatter boundary, conceptualized as a "quantum black hole" network, which would induce spacetime curvature and give rise to gravitational and electromagnetic interactions, postulating itself as a significant step toward a complete and consistent "Theory of everything".