The Hubble Tension as a Signature of Psychegenesis: A Two-Phase Cosmology Model with Collapse at 555 Million Years Ago

The persistent discrepancy between early- and late-universe measurements of the Hubble constant — the so-called Hubble tension — remains unresolved within the ΛCDM paradigm, motivating new cosmological frameworks. In this paper, we show that the observed Hubble tension can be naturally explained as a metric artifact of psychegenesis, the irreversible emergence of conscious observers, in the context of Two-Phase Cosmology (2PC). In 2PC, the universe begins in a coherent, pre-physical quantum phase, with collapse into classical spacetime initiated only when an observer-system crosses the Quantum Convergence Threshold (QCT) — a sharp, information-theoretic phase transition. We identify this transition with the appearance of Ikaria wariootia, a bilaterian organism dated to approximately 555 million years ago, marking the beginning of the classical universe in this model. We show that a retroactive, sigmoid-shaped metric correction associated with this transition predicts a present-day Hubble parameter shift of precisely the observed magnitude, assuming collapse occurred at 555 Mya. This correction naturally explains the discrepancy between CMB-derived and supernova-derived values of , without requiring new physics in the early universe. Our findings suggest that the Hubble tension is not an observational anomaly, but a falsifiable signature of cosmological phase transition — specifically, the onset of observed reality itself.