Proposal of the Cosmic Wave Equation: Mathematical Representation of Non-Zero Energy Fluctuations

This work is the second part of the five-paper series on the Cosmic Wave Equation. Series 2 extends the conceptual framework of Series 1 into mathematics, proposing a universal wave equation to describe energy fluctuations across the cosmos. The equation treats space as a geometric framework rather than a medium, linking local energy density to wave amplitude. This formulation provides an intuitive representation of light, matter, and cosmic expansion. It sets the stage for cosmological applications in Series 3–5.