HONOLULU - TelAve -- The long-standing "Hubble tension"—a discrepancy between early-universe measurements of cosmic expansion and late-universe distance measurements—remains one of modern cosmology's most debated puzzles. While the discrepancy is often interpreted as evidence for new physics in the universe's expansion history, a new study proposes a different possibility: part of the tension may arise from how distances are inferred.

In a recent implications analysis, independent researcher Aiden B. Smith examines whether gravitational-wave distance measurements—specifically from so-called "dark sirens"—could be subtly affected by assumptions about how gravitational waves propagate across cosmological distances.

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Dark sirens are gravitational-wave events without confirmed electromagnetic counterparts. Their distances are inferred statistically using galaxy catalogues. Smith's analysis uses his previously identified propagation anomaly in the GWTC-3 dataset as a template and asks: if gravitational-wave amplitudes decay slightly differently than predicted by General Relativity, what effect would that have on cosmological inference?

The study finds that, under this hypothesis, applying standard General Relativity during distance compression can induce a shift in the inferred Hubble constant of approximately +2 to +5 km/s/Mpc—comparable in scale to the observed tension.

Importantly, the paper does not claim to resolve the Hubble tension. Instead, it demonstrates that gravitational-wave propagation assumptions are not mathematically neutral: if even modest deviations are present, they can bias late-time inferences.

The modified-propagation preference identified in the GWTC-3 dark-siren sample has been subjected to internal calibration and stress testing, including injection-based null simulations and robustness checks against selection and catalog perturbations. While the signal remains statistically unusual within the tested framework, confirming its physical origin will require independent replication and larger gravitational-wave samples from future observing runs.

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If confirmed, the results would suggest that part of the Hubble tension may reflect a subtle distance-inference effect rather than a fundamental breakdown of the expansion model itself. If not, the analysis provides a quantitative diagnostic of where dark-siren cosmology may be vulnerable to systematic effects.

The full study and reproducibility materials are publicly available.

Data and Study Availability: While the work is currently in peer review, the full study is available to read on Smith's research journal at quasardipolephenomenon.org. All code and reproducibility artifacts associated with this analysis can be downloaded via Zenodo (DOI: 10.5281/zenodo.18635659) or accessed on GitHub.