A search for the variation of speed of light using galaxy cluster gas mass fraction measurements

Abstract

In this paper, we implement a new method to test the invariance of the speed of light ($c$) as a function of redshift, by combining the measurements of galaxy cluster gas mass fraction, $H(z)$ from cosmic chronometers, and Type-Ia supernovae (SNe Ia). In our analyses, we consider both a constant depletion factor (which corresponds to the ratio by which the cluster gas mass fraction is depleted with respect to the universal baryonic mean) and one varying with redshift. We also consider the influence of different $H_0$ estimates on our results. We look for a variation of $c$, given by $c(z)=c_0(1+c_{1}z)$. We find a degeneracy between our final results on $c$ variation and the assumptions on the gas mass fraction depletion factor. Most of our analyses indicate negligible variation of the speed of light.

8 pages, 7 figures , I table, Accepted for publication in JCAP

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• Shadows of black holes at cosmological distances in the co-varying physical couplings framework
• Constraining Coupling Constants' Variation with Supernovae, Quasars, and GRBs
• Non-parametric reconstruction of the fine structure constant with galaxy clusters
• Measuring the speed of light with cosmological observations: current constraints and forecasts
• A pilot search for MeV gamma-ray emission from five galaxy clusters using archival COMPTEL data
• Galaxy cluster hydrostatic bias in Kottler spacetime
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• A Stacked Analysis of GeV Gamma-Ray Emission from SPT-SZ Galaxy Clusters with 16 Years of Fermi-LAT Data
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• Brans-Dicke-like field for co-varying $G$ and $c$: observational constraints
• A model-independent test of speed of light variability with cosmological observations
• Revisiting the Constancy of the Speed of Light: Galaxy Cluster Mass Bias Implications