This repository contains the SymC cosmology research program, where the universal critical-damping boundary (χ = γ/2|ω|) is applied to the largest dynamical system accessible to physics: the evolution of the universe itself. These works extend the SymC framework into quantum measurement, early-universe field relaxation, horizon-layer physics, oscillatory substrate modes, and the emergence of late-time cosmic acceleration.

The central idea is that the same χ-governed stability window that appears in quantum systems, biological regulation, seismology, and neural dynamics also governs cosmological evolution. In the SymC model, cosmic acceleration is not a parameter to be inserted — it is a stability phase of the cosmic substrate itself, inherited through cross-domain χ transitions and second-order exceptional point behavior.

• Cosmic Acceleration (v4): Critical-damping evolution linking quantum measurement to large-scale cosmic dynamics.
• SymC in Black-Hole Structure: EP-boundary behavior and critically damped horizons.
• SymC Coupled-Oscillator Neutrinos: Flavor oscillation as χ-driven substrate dynamics.
• SymC and the QFT: Dissipative field dynamics and exceptional-point convergence.

• A universal χ-boundary applied to cosmology and horizon physics
• A substrate-inheritance model explaining transitions from the quantum regime to classical expansion
• A natural stability-derived origin for cosmic acceleration
• A cross-domain unification linking microscopic oscillatory systems to macroscopic expansion behavior

This space provides a clear, structured home for SymC cosmological work, enabling researchers to trace how the universal damping boundary shapes:

• quantum-to-classical transitions
• early universe relaxation
• neutrino oscillation stability
• black-hole horizon structure
• late-time acceleration

All papers are fully open-access (Zenodo), rigorously cross-referenced, and formatted for reproducible theoretical development.