Version 1.4 consolidates the Structural Plenitude Theory into a unified substrate framework. It formalizes viscoelastic vacuum dynamics, structural impedance modeling, and propagation-level corrections compatible with ΛCDM background expansion.
This version introduces a propagation correction formalism that preserves standard cosmological background evolution while allowing phenomenological testing within Boltzmann solvers (CLASS / CAMB).
SPT v1.4 is structured as an effective field extension operating at the propagation level rather than modifying Einstein equations directly.
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