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Measuring the speed of light with cosmological observations: current constraints and forecasts
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abstract
We measure the speed of light with current observations, such as Type Ia Supernova, galaxy ages, radial BAO mode, as well as simulations of forthcoming redshift surveys and gravitational waves as standard sirens. By means of a Gaussian Process reconstruction, we find that the precision of such measurements can be improved from roughly 6\% and to about $2-2.5\%$ when the gravitational wave simulations are considered, and to $1.5-2\%$ when redshift survey are included in the analysis as well. This result demonstrates that we will be able to perform a cosmological measurement of a fundamental physical constant with significantly improved precision, which will help us underpinning if its value is truly consistent with local measurements, as predicted by the standard model of Cosmology.
Forward citations
Cited by 2 Pith papers
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New analysis of SNeIa Pantheon Catalog: Variable speed of light as an alternative to dark energy
A variable-speed-of-light model with a modified Lemaître redshift formula fits the Pantheon supernova catalog with H0 ≈ 47 and no dark energy.
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Dilaton-induced variations in Planck constant and speed of light: An alternative to Dark Energy
The paper assigns dilaton-dependent ℏ and c in a scale-invariant fermion-gauge action, derives a τ∝l^{3/2} time scaling, and claims this replaces dark energy, with the supernova fit deferred to a companion paper.
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