Kinematic Sunyaev-Zeldovich (kSZ) measurements show dipolar patterns in the velocity distribution of clusters across the sky. The dipole amplitude and direction should match the kinematic CMB dipole if our peculiar motion alone produces them, but cluster kSZ-derived dipoles show systematic structure that hints at additional non-kinematic contributions beyond pure peculiar motion (Hand 2012; Schaan 2016; De Bernardis 2017).
The standard model treats kSZ dipoles as purely kinematic, sourced by our peculiar velocity through a globally isotropic cluster distribution. Persistent residual non-kinematic structure has nowhere to go in the model except as systematic survey effects.
SCT replaces the hot-dense-center with a superluminal collision and the thermalized debris field. From this single change, kSZ dipoles decompose into two predicted geometric components. The first is a kinematic component aligned with the CMB dipole, sourced by our patch's residual frame velocity (P63, P64). The second is a cascade-J + dynamical-Λ_eff component perpendicular to the kinematic axis, sourced by the J-vector inheritance (P31, P32) plus the Λ_eff(x,t) gradient (P17, P19).
The KBC supervoid (P19) plus dynamical Λ_eff (P17) provide environment-dependent contributions to the cluster peculiar-velocity distribution. The two-axis kSZ dipole structure is geometrically required to be approximately perpendicular per P64. Sibling-pocket gravitational influence (P58, P59, P60) at 1 to 2 Gpc separations adds a smaller third contribution. Combined, the total kSZ dipole pattern matches observations with the predicted two-axis structure.
The same M9 + M5 framework that produces dark flow (recid 12), the CMB dipole excess (recid 31), the galaxy distribution dipole (recid 77), the bulk-flow excess (recid 87), and the kSZ null hint (recid 166) accounts for the kSZ dipole pattern. There is no need to invoke survey systematics or breakdown of the cosmological principle beyond cascade-geometry effects.
If precision Simons Observatory + CMB-S4 kSZ dipole analysis with full directional decomposition finds the kSZ dipole consistent with pure kinematic at the 5% level (no perpendicular cascade-J or Λ_eff component), the M9 + M5 cascade-geometry explanation is refuted. The signature SCT prediction is the two-axis structure with approximately 90-degree separation between kinematic and non-kinematic components.