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Testing the speed of light over cosmological distances: the combination of strongly lensed and unlensed supernova Ia

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arxiv 1810.01287 v1 pith:GIFRFVS5 submitted 2018-10-02 astro-ph.CO

Shuo Cao , Jingzhao Qi , Marek Biesiada , Xiaogang Zheng , Tengpeng Xu , Zong-Hong Zhu This is my paper · ORCID
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keywords lightspeeddistantlensedlsstmeasurementsobjectsstrongly
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abstract

Probing the speed of light is as an important test of General Relativity but the measurements of $c$ using objects in the distant universe have been almost completely unexplored. In this letter, we propose an idea to use the multiple measurements of galactic-scale strong gravitational lensing systems with type Ia supernova acting as background sources to estimate the speed of light. This provides an original method to measure the speed of light using objects located at different redshifts which emitted their light in a distant past. Moreover, we predict that strongly lensed SNe Ia observed by the LSST would produce robust constraints on $\Delta c/c$ at the level of $10^{-3}$. We also discuss whether the future surveys such as LSST may succeed in detecting any hypothetical variation of $c$ predicted by theories in which fundamental constants have dynamical nature.

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  1. A Joint Analysis of Strong Lensing and Type Ia Supernovae to Determine the Hubble Constant

    astro-ph.CO 2025-05 conditional novelty 5.0 of 10

    A model-independent combination of strong lensing and supernova data gives H0 = 70.55 ± 7.44 km/s/Mpc, consistent with both Planck and SH0ES within 1sigma.

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