The Granular Cosmic Vacuum: A Complete Structural Picture of the Universe

The Granular Cosmic Vacuum (GCV) model proposes that what is usually called the “intergalactic void” is not a smooth, featureless background, but a structured, granular vacuum with distinct physical domains. The universe is organized into three structural regions: P1, the interior of galaxies, where General Relativity (GR) and Quantum Field Theory (QFT) are locally valid; P2, the intergalactic “desert”, where the vacuum consists of a lattice of microscopic white holes stabilized by contracted temporal strings; and P3, the galactic edges and halos, where closed spatial membranes generate the effective gravitational effects commonly attributed to dark matter. In this framework, dark energy is identified with the geometric tension of a closed temporal string extending across cosmological scales, rather than with quantum vacuum energy or a mysterious fluid. Dark matter is reinterpreted as the pressure and curvature of closed spatial membranes in P3, eliminating the need for new particle species. The model provides explicit mathematical relations linking Planck-scale tension to the observed dark-energy density, and it predicts testable signatures: an additional, distance- and energy-dependent damping of high-energy gamma rays propagating across the granular vacuum, and a small, distance-dependent correction to the Casimir force at sub-micron separations. By replacing unknown substances with geometric and structural properties of the vacuum, the GCV model offers a coherent, falsifiable alternative to the standard ΛCDM paradigm and addresses the conceptual puzzles associated with dark energy and dark matter.