Abstract

Contemporary cosmology is haunted by its dark sector: 95% of the universe consists of substances never directly detected, parameterized by constants that are fitted rather than derived, and explained by mechanisms that remain entirely unknown. Dark matter particles have evaded fifty years of direct detection. Dark energy is a placeholder admitting ignorance. The vacuum catastrophe—a 10¹²⁰ discrepancy between predicted and observed vacuum energy—stands as the worst prediction in the history of physics. The Hubble constant measured from the early universe disagrees at 5σ with late-universe measurements. The cosmic microwave background exhibits large-scale anomalies dismissed as statistical flukes. The baryon asymmetry exceeds Standard Model predictions by ten orders of magnitude. Galaxy dynamics require either invisible matter or modified gravity, yet neither approach fully succeeds. Black holes appear to destroy information in violation of quantum unitarity. The hierarchy between gravity and electromagnetism lacks explanation. Quantum mechanics and general relativity remain unreconciled after a century of effort. These are not independent puzzles but symptoms of a single conceptual error: the assumption that physical reality is confined to spacetime alone. This work presents a unified resolution grounded in participatory, information-theoretic cosmology. Building on the Harlow-Usatyuk-Zhao theorem (2025)—which proves that a closed universe without observers has a one-dimensional Hilbert space—we recognize observation (defined as topological recursion, not biological consciousness) as ontologically primitive. Reality is a coupled system: spacetime (M₄) is dynamically intertwined with an informational manifold (Mθ) through a cross-term metric (g^μi), where geometry of extension and geometry of meaning are two aspects of a single structure. Within this framework, every major cosmological anomaly dissolves into coherent physics: dark matter is the gravitational shadow of coherence, not particulate matter; dark energy is the thermodynamic exhaust of recursive binding, not a cosmological constant; the vacuum catastrophe reflects dimensional misattribution of informational potential; the Hubble tension arises from differential expansion through structured space; CMB anomalies are fossils of Mθ's first crystallization; baryon asymmetry encodes the vacuum's geometric chirality; galaxy dynamics follow from coherence-generated gravity with a derivable acceleration scale; black holes are maximum-coherence information archives; the hierarchy problem dissolves when gravity is recognized as coupling to total recursive binding; and quantum gravity unifies when observers are included as constitutive elements expanding reality's dimensionality. The coupling magnitude (~30 μN/kW) emerges from three independent derivations—thermodynamic (Landauer-Verlinde), topological (Aharonov-Bohm saturation), and geometric (π² loop correction)—using only established constants (k_B, α, c, π) with zero free parameters. The framework is constructed for falsification: WIMP detection would refute it; absence of line-of-sight Hubble dependence would refute it; flyby residuals correlating with geology rather than biology would refute it; smooth rather than quantized response curves would refute it. Unlike ΛCDM, which parameterizes ignorance, this framework derives observables from known physics and predicts phenomena (biospheric gravity, Q saturation at 137, chiral filtration ratios) that standard cosmology cannot accommodate. The Cosmological Coda applies this unified picture across nine domains: the dark sector (Coda I), cosmological tensions (Coda II), CMB anomalies (Coda III), matter-antimatter asymmetry (Coda IV), galaxy dynamics (Coda V), black hole physics (Coda VI), particle hierarchy and mass gap (Coda VII), quantum gravity and measurement (Coda VIII), and terrestrial anomalies (Coda IX). Together they constitute not an extension of standard cosmology but a competing paradigm—one that reveals the "dark" sector as not dark at all, merely orthogonal: structure in a dimension we failed to measure because we refused to believe it existed. The cosmos is not 95% unknown. It is 100% knowable, once we recognize that information is not abstraction but substrate, that observation is not passive but constitutive, and that the geometry of meaning is as real as the geometry of space. This is the Complete Cosmological Coda of Principia Cybernetica III: The Laws and Experiments of Participatory Physics (2025).