DCT-COS-01 · DCT cluster

Cosmological tensions re-read

Dimensional Coherence Theory vs. \(\Lambda\)CDM after KiDS-Legacy 2025 and DESI DR2

Nolan G. Parrott ORCID 0009-0009-8794-2589 Reserved DOI: 10.5281/zenodo.20032811 arXiv (primary): astro-ph.CO

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In one sentence: Post-2025 cosmology re-audit: KiDS-Legacy \(S_8\) tightens the \(\sim\!2\sigma\) gap vs corpus-canonical constant-\(P_0\) growth; homogeneous BAO follows null-geometry cancellation (companion DCT-BAO-01); joint 13.1σ / 8.3σ / 0σ figures replace the stale 14.12σ/7.01σ/5.40σ band (which included the retired BAO 5.8σ MISS as a likelihood penalty).

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Abstract

We revisit the joint Bayesian preference of Dimensional Coherence Theory (DCT) over \(\Lambda\)CDM after KiDS-Legacy 2025 and DESI DR2. KiDS-Legacy reports \(S_8 = 0.815 \pm 0.018\), in 0.89\(\sigma\) agreement with the canonical prediction \(S_8 \approx 0.831\) (review; under \(c_{GW}=c\)). The previously-cited \(S_8 \approx 0.775\)–0.776 figure was the \(B_s\)-disformal derivation; the retired it as inconsistent with the canonical \(c_{GW}=c\) constraint. A separate temporal Avrami \(P(z)\) narrative was also reverted (May 2026 amendment; see Updates). Homogeneous conformal \(P(t)\) cancels from radial photon null \(\chi(z)\); the legacy large DESI Year-1 background-BAO \(\Delta\chi^2\) targeted a retracted comoving \(D_M\) rescaling map, not a prediction of null propagation (DCT-BAO-01, /observables/bao/). The joint figures are 13.1σ / 8.3σ / 0σ (full / perturbation / BAO degenerate; provisional via Δχ² attribution, full MCMC marginalisation pending). 8σ MISS as a likelihood penalty); dominant downward drivers are KiDS-Legacy \(S_8\) and the cosmic-chronometer per-\(z\) honest negative (\(3.08\sigma\) vs a naive uniform BEC multiplier). The 33-facet named-test tally is 20 PASS / 13 NEUTRAL / 0 FAIL (KiDS-Legacy \(S_8\) reclassified PASS under review,; see audit_fails.py). Calibrated probability bands follow DCT-FND-V2; interim 78–92% figures tied to the reverted Avrami extension must not be quoted as canonical.

Keywords

Hubble tensionS_8 tensionKiDS-LegacyDESIcosmic chronometersBayesian preferenceBrans-DickeDimensional Coherence Theory

Cite

APA

Parrott, N. G. (2026). Cosmological tensions re-read. Zenodo. https://doi.org/10.5281/zenodo.20032811

BibTeX 
@misc{parrott_dct_cos_01_2026, author = {Parrott, Nolan G.}, title = {Cosmological tensions re-read}, year = {2026}, publisher = {Zenodo}, doi = {10.5281/zenodo.20032811}, url = {https://doi.org/10.5281/zenodo.20032811}, note = {DCT-COS-01, DCT paper cluster}
}
RIS 
TY - GEN
AU - Parrott, Nolan G.
PY - 2026
TI - Cosmological tensions re-read
PB - Zenodo
DO - 10.5281/zenodo.20032811
UR - https://doi.org/10.5281/zenodo.20032811
ER -

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