Local Supervoid RSFP

The Redshift-Space Fingerprint (RSFP) of the local supervoid refers to the distinctive clustering and velocity-field signatures observed in redshift surveys that trace the boundary and interior of the KBC underdensity. In standard ΛCDM, the large-scale velocity field around a void is expected to show a clean, nearly spherically symmetric outflow driven by the void's negative density contrast. What is actually observed shows more complex, asymmetric patterns — a fingerprint inconsistent with a simple spherical void in a statistically homogeneous background. Successive Collision Theory explains this asymmetry naturally: the KBC supervoid is not a spherical fluctuation but a collision pocket interior with a geometry set by the original pocket shape and the collision impact parameter. Its boundaries are where the collision front swept most intensely, and those boundaries are not spherical; they are shaped by the intersection geometry of two originally irregular spacetime pockets.

The velocity field within and around this irregular void reflects the superposition of multiple effects: gravitational infall toward the overdense bounding shell, inherited bulk flow momentum from the collision event, and locally enhanced expansion due to the reduced tensor mesh density inside the void. These three contributions have different directional alignments, producing the observed complex RSFP pattern. Regions near filamentary walls show strong infall perpendicular to the filament axis; regions deeper in the void interior show the enhanced expansion signal; regions near the collision axis show residual bulk flow coherence. This multi-component velocity structure is a direct prediction of the collision-pocket geometry and gravitational superposition working in concert, providing a distinctive observational signature that distinguishes SCT from ΛCDM.