2020/02/23 by Xiaogang Zheng, Kai Liao, Marek Biesiada +3
Physics and Astronomy · #Angular diameter #Astronomy and Astrophysical Research #COSMIC cancer database #Cosmic microwave background #Cosmology #Cosmology and Gravitation Theories #Duality (order theory) #Galaxies: Formation, Evolution, Phenomena #Luminosity distance #Observational cosmology #Quasar #Redshift #astro-ph.CO
paper · pdf · doi:10.3847/1538-4357/ab7995
8 pages, 6 figures, 1 table, Accepted for publication in ApJ
arxiv created 2020/02/23 · openalex publication_date 2020/04/01 · arxiv updated 2020/04/08 · openalex created_date 2020/04/10 · openalex updated_date 2026/08/05
Abstract General relativity reproduces main current cosmological observations, assuming the validity of the cosmic distance duality relation (CDDR) at all scales and epochs. However, CDDR is poorly tested in the redshift interval between the farthest observed Type Ia supernovae and that of the cosmic microwave background. We present a new idea of testing the validity of CDDR, through the multiple measurements of high-redshift quasars. Luminosity distances are derived from the relation between the UV and X-ray luminosities of quasars, while angular diameter distances are obtained from the compact structure in radio quasars. This will create a valuable opportunity where two different cosmological distances from the same kind of objects at high redshifts are compared. Our constraints are more stringent than other currently available results based on different observational data and show no evidence for the deviation from CDDR at z ∼ 3. Such an accurate model-independent test of fundamental cosmological principles can become a milestone in precision cosmology.