Correction of the Electromagnetic Wave Energy Density

Within the framework of World Quantum Theory (WQT), this paper re-derives the electromagnetic wave energy density formula starting from the particle's own form energy V_e and run energy T_e. The electric field energy density is derived from form energy: u_E = V_e / Volume = (c/d)·ε₀·E² The magnetic field energy density is derived from run energy: u_B = T_e / Volume = B²/(2μ₀) The final formula: u = u_E + u_B = (c/d)·ε₀·E² + (1/2)·B²/μ₀ Compared with the standard formula u = (1/2)ε₀E² + B²/(2μ₀): the 1/2 in the magnetic channel is retained, while the 1/2 in the electric channel is replaced by (c/d). This asymmetry is not a derivation error, but is determined by the definitional difference between form energy and run energy. The appendix traces the origin of the standard physics formula: its derivation starts from macroscopic models (capacitor, inductor), the 1/2 in the formula is a mathematical result of integration, and there are five unstated implicit premises between the specific macroscopic model and the general field energy density conclusion. Keywords: electromagnetic wave energy density, form energy, run energy, implicit premises, environmental dependence