JWST observations of standard candles and standard sirens are often analyzed with priors on H₀ and other cosmological parameters inherited from ΛCDM fits to CMB, BAO, or distance-ladder work. The inferred distances and expansion rates can therefore be biased toward existing results rather than providing fully independent constraints (Riess 2022; Freedman 2024; Efstathiou 2024). Critics note that prior contamination undermines the use of JWST as an independent arbiter of the Hubble tension.
The standard model assumes one universal H₀, so analysis priors should converge on it whether they start from CMB or local-ladder values. The fact that JWST distance estimates can shift between Planck-prior and SH0ES-prior analyses by amounts comparable to the Hubble tension itself reveals that the model has no internal anchor that would force one specific value.
SCT replaces the hot-dense-center with a superluminal collision and the thermalized debris field. From this single change, there is a clean way out of the JWST prior-contamination problem: use the SCT/CAR consensus H₀ = 70.4 ± 0.4 km/s/Mpc (Paper 16) as the Bayesian prior. SCT's H₀ sits intermediate by construction between Planck (67.4, biased low by ignoring KBC) and SH0ES (73.0, biased high by host inheritance). The intermediate value is not a compromise; it is the cosmic-mean local H₀ predicted by the dynamical-Λ_eff(x,t) field (P17) once both biases are properly modeled.
Pre-existing matter from prior cascade cycles (P25, P28) supplies the heterogeneous host populations that bias SH0ES upward through Cepheid-host selection effects. The KBC supervoid (P19) provides the local enhancement of Λ_eff that biases SH0ES upward through line-of-sight integration. Mesh dissipation (P14, P15, P16) provides the post-recombination Λ_eff temporal evolution (P18) that biases the Planck CMB-extrapolated value downward when it is read off as a local H₀. Both biases are real; both are predicted; both center on the SCT/CAR intermediate value.
Broad-uniform-prior JWST analysis (independent of any ΛCDM-anchored prior) should converge on H₀ ≈ 70.4 km/s/Mpc as the data-driven value, with environmental scatter consistent with the M5 framework. Bayesian model comparison gives ΔBIC = −411 in favor of CAR vs ΛCDM (Paper 16). The same M5 framework that resolves the broader Hubble tension family lets JWST escape prior contamination by adopting a non-circular intermediate prior.
If broad-uniform-prior JWST analysis converges to either H₀ ≈ 67.4 (Planck value) or H₀ ≈ 73.0 (SH0ES value) at greater than 5σ preference over the intermediate 70.4, the M5 consensus value is refuted. Equivalently, if the ΔBIC = −411 advantage of CAR over ΛCDM fails to replicate in independent analyses, the SCT framework loses its statistical anchor.