Abstract: This framework postulates that the universe operates as a self-bound, closed thermodynamic system constrained by hyperbolic spatial geometry. The Cosmic Microwave Background is identified as a saturated scalar field observed at a temperature of approximately 2.7 K and functions as the primary energetic substrate rather than residual radiation. This background corresponds to a geometric null state, a wavelength regime matched to the hyperbolic curvature of space for which propagation incurs no geometric dissipation.
