From Scratch IV: The Cosmic Microwave Background Is Not a Record of Early Time

This paper presents a test of a foundational assumption in cosmology: that the large-angle temperature anisotropies of the cosmic microwave background constitute a preserved record of early cosmic conditions. Using publicly available Planck frequency maps, the analysis examines how the low-multipole structure of the 143 GHz temperature field responds to controlled conditioning by independently observed present-day sky structure traced by the 353 GHz channel. The conditioning is applied at the map level using fixed, non-optimized coefficients and does not rely on cosmological modeling, parameter fitting, component separation products, or early-Universe physics. We find that conditioning aligned with the true sky geometry produces an order-of-magnitude collapse of large-angle power, while control operations such as rotated-template null tests do not reproduce the effect. The suppression persists under conservative Galactic latitude masks and strengthens at high latitudes, indicating that the behavior is global rather than confined to the Galactic plane. These results show that the observed large-angle CMB temperature field is not invariant under physically motivated perturbations tied to the contemporary sky. A signal whose dominant structure responds coherently to present-day sky morphology cannot function as an observationally autonomous record of early cosmic time. The standard interpretation of the large-angle CMB as a preserved primordial imprint therefore fails this empirical test.