A model independent constraint on the temporal evolution of the speed of light

Dandan Wang, Hanyu Zhang, Jinglan Zheng, Yuting Wang, Gong-Bo Zhao

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Abstract

We present a new, model-independent method to reconstruct the temporal evolution of the speed of light c(z) using astronomical observations. After validating our pipeline using mock datasets, we apply our method to the latest BAO and supernovae observations, and reconstruct c(z) in the redshift range of z ∈ [0,1.5]. We find no evidence of a varying speed of light, although we see some interesting features of Δc(z), the fractional difference between c(z) and c0 (the speed of light in the International System of Units), eg, Δc(z) < 0 and Δc(z) > 0 at 0.2≲ z ≲0.5 and 0.8 ≲ z ≲ 1.3, respectively, although the significance of these features is currently far below statistical importance.
Original languageEnglish
Article number152
Number of pages7
JournalResearch in Astronomy and Astrophysics
Volume19
Issue number10
DOIs
Publication statusPublished - 1 Oct 2019

Keywords

  • cosmology
  • dark energy
  • large scale structure

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