When two galaxies merge, their central SMBHs form a bound binary that should shrink through interacting with stars and gas. At separations of order a parsec, standard loss-cone scattering and dynamical friction become inefficient, so the binary stalls before gravitational-wave emission takes over (Begelman 1980; Vasiliev 2014; Khan 2013; Merritt 2013). The Final Parsec Problem creates tension between theoretical expectations of long-lived stalled binaries and PTA inferences suggesting frequent SMBH coalescences.
The standard model has SMBH binary inspiral driven entirely by stellar dynamical friction in CDM halos plus gas-disc dynamics. At parsec separations both mechanisms become inefficient, leaving the binary stalled. Resolving the gap demands special galaxy shapes (triaxial CDM halos), gas-physics tuning, or dark-matter microphysics. None of these is parsimonious within minimal ΛCDM.
SCT replaces the hot-dense-center with a superluminal collision and the thermalized debris field. From this single change, mesh dissipation provides a continuous orbital-energy-extraction mechanism that operates across cosmic time on all SMBH binaries (P14, P15, P16). The progressive weakening of the parent-frame gravitational mesh acts as a long-term drag on the binary's orbital evolution, naturally driving the binary through the parsec gap without requiring separate stellar-dynamical or gas-driven inspiral mechanisms.
The mesh-dissipation contribution to SMBH binary inspiral is small at any single epoch but cumulative across Gyr timescales. Combined with whatever residual stellar and gas friction operates at parsec scales, mesh dissipation completes the inspiral path that brings the binary into the gravitational-wave-emission regime. Dynamical Λ_eff(x,t) (P17) gives slow secular orbital decay even when stellar/gas friction halts. The same mesh-dissipation cascade (P18) that drives the long-term cosmological apparent expansion drives SMBH binary inspiral at the local-scale level.
Gravitational superposition (P50, P51, P52, P54) provides the smoother halo context that further reduces stellar-friction efficiency, so the mesh-dissipation contribution becomes the dominant inspiral channel at parsec scales. The SCT prediction matches the PTA inspiral signal frequency observed (recid 148): SMBH binaries do successfully merge across cosmic time, providing the nHz GW background NANOGrav detects. There is no need for special triaxial CDM halo geometries or fine-tuned gas physics.
If precision PTA + LISA observations find SMBH binary inspiral statistics fully consistent with ΛCDM-only stellar/gas-friction predictions plus stalling at parsec scales (no mesh-dissipation contribution), the M5 mesh-driven inspiral explanation is refuted. The signature SCT prediction is binary inspiral rates matching the observed PTA signal through mesh dissipation operating continuously alongside stellar/gas mechanisms.