Dark energy is 70 percent of the universe and has no physics: ΛCDM models it as a uniform constant with w = -1 exactly, cannot say what it is, mispredicts its only candidate identity (vacuum energy) by 120 orders of magnitude, and dials its value to observation. The newest data deepen the vacancy: DESI prefers an evolving equation of state at up to 4.2σ, behavior a constant cannot exhibit.
The model assumed acceleration must be caused by a substance, an energy filling empty space, and then could never identify the substance. Once dark energy is a thing rather than an effect, the questions multiply unanswerable: what is it, why this density, why now, why uniform. The placeholder hardened into furniture.
SCT's keystone here is a single premise: dark energy is not a physical substance filling space but the name applied to the observational effect of progressive mesh weakening across nested parent frames (P16, stated in exactly those terms). The gravitational mesh in which our patch is embedded dissipates through ordinary three-body ejection and dynamical friction (P14); an embedded observer cannot feel their own clock rate change but sees distant light shift, reading the mesh's decay as accelerating recession (P15). The bookkeeping term this produces in the field equations is the dynamical ratio Λ_eff(x,t) = C × Λ_parent(x,t) / λ_local(x,t) (P17): dark energy, fully identified, with standard GR throughout and nothing added to the inventory of substances. The full mechanism is laid out in Paper 7, From Chaos To Cosmic Expansion.
Every mystery attached to the substance dissolves with the substance. The density question becomes the hierarchy's statistics; the uniformity assumption becomes false in a calculable way (environmental variation at the few-percent level, the Hubble-tension and Migkas signatures); the DESI evolution is the mesh's slow decay surfacing in a homogeneous fit (w₀ = -0.94, w_a = -0.58 derived, 1.2σ from the contours); and "why now" reduces to when structure formed.
Three premises name the effect, and the identification then pays across the ledger: the Hubble tension, the coincidence problem, the cosmological constant problem, the DESI dynamics, and the non-expansion of bound systems are one mechanism read five ways. There is no need to populate the universe with an unexplained fluid.
An effect must show its environments: the registered kills require expansion to vary with Λ_eff conditions, roughly 9 percent between void-dominated and overdense sightlines, and bound systems to show exactly zero cosmological expansion (confirmed). Environment-tagged DESI measurements finding perfect uniformity at the 2 percent level, or precision detection of expansion inside virialized clusters, would falsify the mesh identification and return dark energy to substance status.