CMB Cold Spot (A = −70µK, 3-Sigma)

The CMB Cold Spot — a roughly 10-degree-radius region centered near Eridanus with a temperature decrement of approximately −70 µK — is anomalous within ΛCDM because its depth and angular scale together exceed what random Gaussian fluctuations should produce at the three-sigma level. Supervoid explanations invoking the integrated Sachs-Wolfe effect fall short of explaining the full amplitude, leaving ΛCDM without a satisfactory causal account. In Successive Collision Theory, the Cold Spot is a direct geometric imprint of the superluminal collision. Grazing collisions produce rotating halos while head-on collisions produce filaments; the precise collision impact parameter and pocket boundary geometry will have created localized regions of lower energy density at the moment of thermalization. These correspond to zones where the two collision fronts did not overlap with full constructive interference — patches where the effective energy deposition was below the global mean. The Cold Spot lies along the same preferred axis defined by the quadrupole and octupole alignments, consistent with a single collision geometry rather than a collection of independent statistical accidents.

The Eridanus Supervoid — a ~300 Mpc underdense region in the foreground — further amplifies the observed temperature decrement through the integrated Sachs-Wolfe effect. In SCT, the supervoid itself is not coincidental: large underdense regions preferentially form where the tensor mesh of the nested gravitational hierarchy is locally weak, precisely because Λ_eff is enhanced in underdense environments. The Cold Spot's anomalous depth is therefore the superposition of a primordial collision-geometry imprint at the surface of last scattering and a foreground ISW decrement from the supervoid, both of which are physically connected to the same underlying SCT framework rather than requiring separate fine-tuned explanations.