Cosmic distance duality as a probe of minimally extended varying speed of light

TL;DR

This paper tests a minimally extended varying speed of light model using cosmic distance duality relation data from supernovae, Hubble measurements, and CMB, finding a slight deviation from standard cosmology.

Contribution

It provides the first observational constraint on the minimally extended varying speed of light model using multiple cosmological data sets.

Findings

Current data shows a 1-sigma deviation from standard cosmic distance duality.

Constraints suggest possible deviations in the speed of light over cosmic time.

Future observations could tighten these constraints significantly.

Abstract

We obtain the current constraint on the minimally extended varying speed of light (meVSL) model by analyzing cosmic distance duality relation (CCDDR) of it, $D_{L}/D_{A}(1+z)^{-2} = (1+z)^{b/8}$. We use the Pantheon type Ia supernova (SNIa) data, the Hubble parameter $H(z)$ using the cosmic chronometers approach, and the cosmic microwave background (CMB) distance priors from the latest Planck data. We find that the current data show the 1-$\sigma$ deviation from the standard CCDDR. Thus, this provides the constraint on meVSL model and future precision observations might be able to put stronger constraints on it.