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Keyword: variable speed of light ×Clear all

3 claims from 1 paper

1. Physics and Astronomy › Cosmology and Gravitation Theories

   Late-time varying-speed-of-light test of the DESI DR2 geometrical preference

   Wang and Wang · The European Physical Journal C · 2026

   Using only late-time data, the paper tests whether a redshift-dependent speed of light can explain DESI DR2's geometrical preference, and finds ε consistent with zero and no support for that explanation.

   Unchecked3 claims
   Show 3 claims

   1. UncheckedWith DES-Dovekie supernovae, DESI DR2 and cosmic-chronometer data, the light-speed parameter ε is -0.096 with uncertainties of about +0.125 and -0.114.“For the main DES-Dovekie+DESI DR2+ $$H(z)$$ H ( z ) combination we obtain $$\epsilon =-0.096^{+0.125}_{-0.114}$$ ϵ = - 0 . 096 - 0.114 + 0.125 .”
   2. UncheckedUsing Pantheon-plus supernovae instead of DES-Dovekie, the fitted light-speed variation parameter ε is -0.048 (+0.142, -0.122), a value that includes zero.“Replacing DES-Dovekie by Pantheon-plus gives $$\epsilon =-0.048^{+0.142}_{-0.122}$$ ϵ = - 0 . 048 - 0.122 + 0.142 .”
   3. UncheckedAdding a varying-speed-of-light term lowers the best-fit chi-squared by only 1.05 versus flat ΛCDM, and AIC and BIC both penalise the extra parameter.“The VSL extension improves the minimum $$\chi ^2$$ χ 2 by only $$1.05$$ 1.05 relative to flat $$\Lambda \textrm{CDM}$$ Λ CDM , and is penalized by both AIC and BIC.”