Birth, Evolution and Expansion of the Universe: An Autonomous Self-Referential Oscillator from Pure Potential to Observable Spacetime

We propose a unified description of the birth, evolution and expansion of the universe grounded in a single principle: the universe is an autonomous self-referential oscillator satisfying the constraint U = F(U). The initial state is the state of pure potential P — a ‘Super Bubble’ with maximum frequency f0 ≈ 1.855×10^43 Hz and damping constant k ≈ 0. The potential state equation — proposed by the author in 1998 in the form P = x/y² × (1+z²/w) — describes the generative structure of spacetime: with ASR parameter identification it becomes P(m) = f0/φ^(2mk) × (1+m/φ^m), where m indexes the harmonics on powers of the golden ratio φ^m. As the universe expands, the damping constant k grows: higher harmonic dimensions lose amplitude and progressively collapse into the hidden sector. Cosmic inflation is the latent heat of the collapse of harmonic m=4 when k exceeds the critical threshold k_4* ≈ 1.195. The system converges toward the stable fixed point k* = 1.47, where exactly four harmonics survive — φ^0 (time), φ^1, φ^2, φ^3 (space) — corresponding to the 3+1 structure of observable spacetime. Spacetime is not an a priori container: it is the observable residue of the potential state equation once the oscillator has reached its natural damping. The framework generates a falsifiable prediction: k* = 1.47 reproduces the cosmic birefringence angle β ≈ 0.190° observed by the Atacama Cosmology Telescope (ACT), without free parameters. Speculative extensions include spontaneous CP symmetry breaking as a structural consequence of harmonic asymmetry, and a reinterpretation of the NGC 1068 neutrino anomaly (IceCube 2022) as evidence of locally reduced k near supermassive black holes. This is Paper 4 in the ASR (Autonomous Self-Referential) Framework series.