The Phantom Metric: Transient Non-Linear Damping and Phase Transition as a Complete Alternative to Cold Dark Matter

The enduring failure to directly detect Cold Dark Matter (CDM) particles necessitates a paradigm shift in our understanding of cosmological dynamics. In this letter, we propose the "Phantom Metric"—a novel framework based on a Dirac-Born-Infeld (DBI) action, modeling spacetime not as a passive vacuum, but as an active, Planck-frequency resonance grid. We demonstrate that the apparent effects of CDM in the early universe, specifically the acoustic peaks in the Cosmic Microwave Background (CMB), emerge naturally from a primordial phase transition. During this epoch, baryonic matter injected at ultra-relativistic relative velocities experienced a transient, highly asymmetric geometric braking (Cosmic Bremsstrahlung) against the local expansion. By implementing a dynamically relaxing Phantom potential, we successfully reproduce the Planck satellite CMB TT power spectrum without invoking any dark matter particles. Our results indicate that the speed of light is a dynamically generated barrier—a scar of the initial cosmological phase transition—and that the universe subsequently relaxed into a kinematically frictionless superfluid state. The Phantom Metric & Topological Spacetime - Complete Cosmological Framework: This manuscript is part of a comprehensive 7-part theoretical framework resolving dark matter, dark energy, and relativistic mechanics through macroscopic topological boundaries. The complete series includes: “The Phantom Metric: Resolving Dark Matter Anomalies in Galactic Kinematics, Strong Lensing, and Galaxy Clusters via Topological Constraints and Topological Metric Deformation (Parameter-Free)” DOI: 10.5281/zenodo.22859521 “The Duality of Topological Saturation: Phase Transitions, Manifold Expansion, and the Phantom Metric” DOI: 10.5281/zenodo.22750704 “Empirical Predictions of The Phantom Metric: Falsifying Dark Matter via High-Redshift Kinematics and Macroscopic Lensing” DOI: 10.5281/zenodo.22890604 “The Phantom Metric: Transient Non-Linear Damping and Phase Transition as a Complete Alternative to Cold Dark Matter” DOI: 10.5281/zenodo.23131615 “Topological Spacetime Cosmology: Resolving the Vacuum Catastrophe, the Hubble Tension, the Dark Energy Enigma, and Deriving the Absolute Baryonic Mass of the Universe via Entropic Metric Dilation” DOI: 10.5281/zenodo.22995959 “The Genesis of Relativistic Mechanics: Time, the Speed of Light, and Gravity as Emergent Properties of Baryonic Impedance on the Planck Frequency” DOI: 10.5281/zenodo.23041408 “Empirical Predictions of Topological Spacetime Cosmology: Void Expansion Dynamics and Metric Anisotropy” DOI: 10.5281/zenodo.22997116