DESI baryon acoustic oscillation measurements, combined with the CMB and Type Ia supernovae, prefer an evolving dark energy equation of state over a cosmological constant. The 2024 DR1 fits returned w₀ > −1 and w_a < 0 at more than 2σ (arXiv:2404.03002), and the 2025 DR2 release pushed the preference to between 2.8σ and 4.2σ depending on which supernova compilation joins the fit. Taken at face value, dark energy was stronger in the past, crossed w = −1 around z of 0.4 to 0.5, and is weakening today.
ΛCDM hard-codes w = −1 at every epoch and in every environment, because its dark energy is a constant vacuum term in the field equations. The CPL fit assumes one homogeneous dark-energy fluid filling the entire survey volume. If the real expansion rate varies from place to place, the model has nowhere to put the difference except into a fake time evolution of w, and a constant Λ cannot even do that.
SCT replaces the hot-dense-center with a superluminal collision, and with it the constant Λ becomes the dynamical ratio Λ_eff(x,t) = C × Λ_parent(x,t) / λ_local(x,t) (P17), sourced by the slow weakening of the gravitational mesh across nested parent frames (P14, P15, P16). From this single change an apparently evolving w follows. The volume-averaged Λ_eff tracks the growth of structure: virialized regions, where λ reaches values of order 10⁴, suppress their local Λ_eff to nearly zero, so voids carry the expansion and the average shifts with the void fraction.
Paper 15 carries this through quantitatively. With <Λ_eff>(z) tracking Λ₀ f_void(z) and w_eff(z) = -1 + (1/3) d ln <Λ_eff>(z) / d ln(1+z), the Press-Schechter void-fraction evolution yields w₀ = −0.94 ± 0.03 and w_a = −0.58 ± 0.07, consistent with the DESI 2024 contours at 1.2σ. The "phantom crossing" that breaks single-field quintessence is no pathology here, because there is no scalar field at all: it is the signature of a homogeneous CPL template absorbing an inhomogeneous, environment-dependent Λ_eff. One secondary modulation layers on top: the long-term mesh-dissipation cascade (P18) is still in its early exponential phase, which is why the present-day value sits close to w = −1 in the first place.
This is the same mechanism that resolves the Hubble tension, where the KBC supervoid and the temporal evolution of Λ_eff between recombination and today (P19) supply the 4 to 7 km/s/Mpc enhancement. The DESI w(z) signal is one more observational window onto that single underlying mechanism. There is no need to invoke quintessence potentials, interacting dark sectors, or any new field.
Two concrete kills. First, the derived values face DESI Year 3 (2027), Year 5 (2029), and Euclid (2028): w_a > −0.3 at more than 3σ falsifies the SCT w(z) prediction outright. Second, because the signal is an environmental artifact, its amplitude must correlate with the void fraction of the survey volume; DESI or Euclid finding w₀ and w_a independent of survey void fraction at more than 3σ rules out the mechanism.