Radiation-Driven Cosmological Expansion: A Symbolic Model of Emergent Spacetime

This paper introduces a symbolic cosmological model where spacetime emerges dynamically from radiation rather than expanding from an initial singularity. A scalar field S(x,y,t)S(x, y, t)S(x,y,t) is driven by photon emission and evolves through a Lagrangian wave equation with vacuum suppression. Numerical simulations demonstrate that radiation alone can reproduce large-scale expansion trends matching ΛCDM without invoking dark energy or inflation. The model forms a symbolic substrate for further analysis of curvature and energy density.