The CMB is not as featureless as the standard inflationary picture predicts. It carries a hemispherical power asymmetry, a quadrupole-octupole alignment (the "Axis of Evil"), the Cold Spot, a low-multipole power deficit, parity asymmetries, and suspicious phase correlations between large-angle modes. Each of these would be statistically improbable in isolation. Together they paint a picture of structured imprints on what should be a featureless thermal background.
The standard model assumes inflation produces statistically isotropic, Gaussian, random-phase quantum fluctuations that get stretched to cosmic scales. Under that assumption, the CMB should have no preferred directions, no large-angle anomalies, no phase correlations between different multipole modes. Observations across COBE, WMAP, and Planck have stubbornly confirmed all of the above.
SCT replaces the hot-dense-center with a superluminal collision between two pre-existing parent pockets. The collision thermalized into the plasma we now see as the CMB. From this single starting change, two consequences follow simultaneously, and together they account for the CMB anomalies as predicted geometric features rather than statistical anomalies.
The first consequence (M2, the Plasma Equivalence Theorem) is that the bulk CMB power spectrum at multipoles l > 30 is determined entirely by the plasma's thermodynamic state at decoupling: temperature, density, baryon-to-photon ratio, optical depth to reionization, equality wavenumber, and sound horizon (P29, P30). Two plasmas that arrive at the same thermodynamic state by different paths produce acoustically identical CMB power spectra. SCT's cascade-thermalized plasma therefore reproduces the standard CMB power spectrum at small angular scales without distinguishing signatures, because the post-thermalization evolution is governed by the same standard physics ΛCDM uses. The bulk CMB carries through cleanly.
The second consequence (M10) is what produces the large-angle anomalies. The primary collision deposited a preferred geometric axis (the angular momentum vector J = μ(b × v_rel) inherent in any non-head-on collision) that imprints coherently on the largest angular scales of the post-cascade plasma. The Axis of Evil, hemispherical asymmetry, bipolar power patterns, parity preferences, and dipole-direction alignments all share this single geometric origin. They are not five independent anomalies; they are five observational projections of one collision-axis imprint, which is exactly why they all align with each other and with our CMB-frame motion direction. The Cold Spot is a slightly different effect (a region that received marginally less energy injection during the multi-stage cascade thermalization, P36), but it sits in the same overall framework where collision geometry leaves measurable fingerprints on what should otherwise be a featureless thermal background. Two PCGs are needed because the bulk CMB physics (M2) and the large-angle geometric imprints (M10) are different consequences of the same underlying replacement of the hot-dense-center.
If polarization measurements (Simons Observatory, CMB-S4) show that the four anomaly axes (Axis of Evil quadrupole-octupole, hemispherical asymmetry, parity-odd preference, dipole) are mutually inconsistent at >3σ (do not share a common geometric direction), the M10 common-collision-axis explanation is refuted. If the CMB power spectrum at l > 30 deviates from the Plasma Equivalence Theorem prediction at high statistical significance, M2 is refuted.