Extensions of Radiation-Driven Cosmological Expansion: Symbolic Wavefields in 3D, Photon Encoding, Thermodynamics, and Emergent Metrics

This work extends a symbolic cosmological model in which spacetime emerges from radiation rather than preexisting geometry. Building on a prior 2D formulation, we generalize the wavefield to 3D, encode photon frequency and polarization symbolically, impose thermodynamic constraints, and recover an emergent metric tensor from symbolic field derivatives. The model replicates standard cosmological expansion without invoking dark energy or inflation, and provides a symbolic framework and spectral analyses of spacetime structure.