Light Propagation in Plasma Media: The Photonic Barrier and Recalibration of Cosmic Distances in Plasma Pressure Theory v1.0

This paper presents an extension of Plasma Pressure Theory (PPT) Version 2.2, a novel plasma-centric framework that reinterprets gravitational and electromagnetic phenomena as emergent effects of plasma displacement and energetic field interactions, independent of General Relativity. We propose that light propagates as self-circulating toroidal waves through a cosmic plasma medium, with its effective speed ($c_\mathrm{eff}$) modulated by local density ($\rho_\mathrm{local}$), introducing a "photonic barrier" analogous to the sonic barrier. Drawing on Electric Universe principles as an explanatory extension, we derive $c_\mathrm{eff} \approx c / \sqrt{1 + (\omega_p / \omega)^2}$, demonstrating boosts of 30% or more in low-density regions (e.g., $\rho_\mathrm{local} \sim 10^{-27}$ kg/m$^3$), which compress cosmic distances, recalibrating GN-z11 from 32 Gly to 5–10 Mly. Empirical support from SAFIRE Project, Voyager, and JWST data underpins a stable, eternal, and densely packed cosmos model, challenging fixed-$c$ assumptions. Published on October 12, 2025, this work offers testable predictions via density surveys and laboratory experiments, inviting further validation. The accompanying LaTeX source and bibliography are included for transparency, with future revisions planned to refine the model. This pre-print is released under an open-access license to foster scientific discourse in plasma cosmology and alternative cosmologies.