Reconstructing the temporal evolution of the speed of light in a flat FRW Universe  

作　　者：Dan-Dan Wang Han-Yu Zhang Jing-Lan Zheng Yu-Ting Wang Gong-Bo Zhao 

机构地区：[1]National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, China [2]University of Chinese Academy of Sciences, Beijing 100049, China [3]Department of Physics,Kansas State University,116 Cardwell Hall,Manhattan,KS 66506,USA [4]School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, China [5]Institute of Cosmology and Gravitation, University of Portsmouth, Portsmouth, POl 3FX , UK

出　　处：《Research in Astronomy and Astrophysics》2019年第10期138-144,共7页天文和天体物理学研究（英文版）

基　　金：supported by the National Key Basic Research and Development Program of China (2018YFA0404503);the National Basic Research Program of China (973 Program, 2015CB857004);the National Natural Science Foundation

摘　　要：We present a novel method to reconstruct the temporal evolution of the speed of light c(z) in a flat Friedmann-Robertson-Walker(FRW) Universe using astronomical observations. After validating our pipeline with mock datasets, we apply our method to the latest baryon acoustic oscillations(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 △c(z), the fractional difference between c(z) and c0(the speed of light in the International System of Units), e.g.,△c(z)< 0 and △c(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.We present a novel method to reconstruct the temporal evolution of the speed of light c(z) in a flat Friedmann-Robertson-Walker(FRW) Universe using astronomical observations. After validating our pipeline with mock datasets, we apply our method to the latest baryon acoustic oscillations(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 ?c(z), the fractional difference between c(z) and c0(the speed of light in the International System of Units), e.g., ?c(z) < 0 and ?c(z) > 0 at■ respectively, although the significance of these features is currently far below statistical importance.

关 键 词：cosmology-dark energy-large SCALE structure 

分 类 号：P[天文地球]