AbstractDESI DR2 (March 2025, 4. 2σ) finds w₀ = −0. 752 ± 0. 059 and rules out a cosmological constant. We present the first parameter-free derivation of the dark energy equation of state w (z) withinfossil gravity theory (Wartenberg 2026). The Zₛ term of the theory describes spacetimecurvature through causal condensation in Zone 0 - without a mass source term. FromSupplement VII, Eq. VII-29, follows the scaling GBHμν ∝ M², implying a cosmological energydensity ρZS (z) = (4πG/ℏc³) ·⟨M²⟩·nSL, where ⟨M²⟩ is the mean squared total mass and nSL isthe comoving number density of stellar black holes. Both quantities are directly computablefrom gravitational-wave catalogues - without fitting to cosmological data. The effective equationof state wZS (z) = −1 + (1/3) ·dlnρZS/dlna deviates structurally from −1 without freeparameters; this prediction follows from the M² scaling alone. Using the LIGO-Virgo-KAGRAGWTC-3 catalogue (81 BBH events, z = 0. 05-0. 83), we compute ρZS (z) and derive wZS (z) directly from observations. Current results are limited by LIGO selection effects. Selection-corrected results with LIGO O4 data (∼200 events) are identified as the decisivequantitative test. Falsifiable prediction: if wZS (0) lies outside the DESI band, the Zₛinterpretation of dark energy is ruled out. Note on this version (v2): The first version of this paper (May 2026) carried an incomplete andmisattributed entry in the reference list (“Kehle, C. the entry has been corrected accordingly. The content and results of this paper are unaffected by the correction.
Bodo Warteenberg (Wed,) studied this question.