We model the Big Bang as the propagation of a phase-transition front througha pre-existing, phase-coherent medium characterized by a complex order parameterΦ = √ρ eiϑ. Finite sound speed and bulk viscosity in this medium introduce a ma-terial impedance to expansion, modifying the effective pressure according to peff =p − 3ζH. This Coherent Impedance Pressure (CIP) alters early-universe dynamics rel-ative to a perfect-fluid model. We derive the corresponding modification to curvature-perturbation evolution, in which viscous damping suppresses short-wavelength modesmore strongly than long-wavelength modes. The framework predicts: (i) low-k suppres-sion and mild oscillatory features in the matter power spectrum, (ii) partial preservationof long-wavelength phase structure with possible signatures in low-ℓ CMB alignment,and (iii) frequency-dependent propagation of primordial gravitational waves. Thesesignatures are testable with current and near-future surveys including DESI, Euclid,CMB-S4, SKA, PTA networks, and LISA. The model provides an alternative to infla-tionary and bounce scenarios while remaining observationally falsifiable. The coherencepattern imprinted during the transition remains frozen into the fabric of spacetime,forming the enduring structure of the observable universe

For correspondence, comments, or collaboration inquiries:For commercial use or licensing inquiries, please contact:NoSpoonFramework@gmail.com Commercial permissions available upon request. Version 5.1 Additions: Appendix A: Covariant Viscous Dynamics and Scalar Perturbations Appendix B: Mapping to the EFT of Cosmological Perturbations Appendix C: Stability, Causality, and Absence of Pathologies Appendix D: Curvature Perturbations in Comoving Gauge Appendix E: Parameter–to–Observable Mapping

is supplemented by → Impeded-Front Cosmogenesis II:Cosmic Speed Bumps — Front-Stalling Epochs and White-Hole Residueshttps://doi.org/10.5281/zenodo.17849517 is supplemented by → Impeded-Front Cosmogenesis III:Roadmap to Local Stall — A Reconstruction Method for Local Cosmic Originshttps://doi.org/10.5281/zenodo.17882648