The large-scale velocity field and time-evolving gravitational potentials that generate the ISW and kinetic Sunyaev-Zel'dovich (kSZ) effects should be statistically isotropic and well described by linear theory in ΛCDM. Directional reconstructions of ISW and kSZ signals show uneven sky coverage, anisotropic amplitudes, and template mismatches (Ho 2009; Sherwin 2012; Keisler & Schmidt 2013; Ruiz-Lapuente 2019).
The standard model assumes statistical isotropy of the velocity field plus uniform gravitational-potential decay rates. Velocity templates and ISW templates built from galaxy surveys should align cleanly with CMB maps. Persistent template mismatches must be attributed to survey systematics, missing tracers, or unmodeled non-linear corrections.
SCT replaces the hot-dense-center with a superluminal collision and the thermalized debris field. From this single change, both ISW and kSZ acquire predictable directional structure. The kSZ signal carries a bulk-flow component aligned with the CMB dipole at 369 km/s, sourced by our patch's residual frame velocity within the parent frame (P63, P64). The ISW signal carries an environment-dependent potential-decay component aligned with the KBC supervoid axis, sourced by the dynamical Λ_eff(x,t) gradient (P14, P15, P16, P17, P19).
The two signal axes are geometrically required to be approximately perpendicular (P64): the kSZ axis is parallel to the impact parameter b (where v_frame points), while the ISW directional component is parallel to the Λ_eff-gradient (which aligns with the J-vector axis perpendicular to b). Gravitational superposition (P50, P52) modifies both signals through the Φ_mesh contribution that ΛCDM omits. Sibling-pocket gravitational influence at 1 to 2 Gpc separations (P58, P59, P60) adds smaller third contributions to both directional templates.
The same M9 + M5 framework that produces the dark-flow excess (recid 12), the CMB dipole excess (recid 31), the cosmic parallax structure (recid 51), and the redshift-drift anisotropy (recid 58) produces the ISW and kSZ template mismatches. There is no need to invoke survey systematics or missing tracers. The signals are real and structured, with a two-axis decomposition that aligns with cascade-geometry predictions.
If precision Simons Observatory + CMB-S4 directional kSZ + ISW templates show a single isotropic signal with no two-axis structure (kSZ axis equal to ISW axis, or both consistent with isotropy at the 1% level), the M9 sibling-pocket plus Λ_eff-gradient explanation is refuted. The signature SCT prediction is approximately 90-degree separation between the kSZ bulk-flow axis (CMB dipole direction) and the ISW directional component (KBC supervoid direction).