What question did this study set out to answer?

This study aims to evaluate the U-Cell Model's prediction of w=-1 against observational data from DESI DR1.

April 5, 2026Open Access

The U-Cell Model Prediction w=−1 Exactly: A Sharp Falsifiable Test Against DESI DR1 Baryon Acoustic Oscillations

Key Points

This study aims to evaluate the U-Cell Model's prediction of w=-1 against observational data from DESI DR1.
Applied the U-Cell Model to predict w across various redshifts.
Compared results to 13 measurements of baryon acoustic oscillations from DESI DR1.
Calculated chi-squared values to assess model performance against Planck ΛCDM.
Obtained a chi²/dof of 1.54, marginally better than Planck ΛCDM with a Δchi² of -0.42.
DESI BAO yielded w of -0.99 ± 0.14, confirming consistency with UCM.
A ratio test indicated robust results, reinforcing the UCM's predictions.

Abstract

The U-Cell Model (UCM) predicts w=−1 exactly for all redshifts, because the Hubble constant H (z) cancels identically in the void–halo balance that determines OmegaLambda, 0 = 0. 6834. We test this prediction against all 13 DESI DR1 baryon acoustic oscillation measurements and find chi²/dof = 1. 54, marginally better than Planck ΛCDM (Δchi² = −0. 42). DESI BAO alone gives w = −0. 99 ± 0. 14, fully consistent with UCM. A sound-horizon-independent ratio test DM/DH confirms the result. The model makes a sharp prediction: Euclid DR1 (October 2026) will find w = −1 to sub-percent precision, or falsify the mechanism.

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