Model-independent Distance Calibration and Curvature Measurement Using Quasars and Cosmic Chronometers
Wei,Jun-Jie1,2,3; Melia,Fulvio4,4
Source PublicationThe Astrophysical Journal
AbstractAbstract We present a new model-independent method to determine spatial curvature and to mitigate the circularity problem affecting the use of quasars as distance indicators. Cosmic-chronometer measurements are used to construct the curvature-dependent luminosity distance using a polynomial fit. Based on the reconstructed and the known ultraviolet versus X-ray luminosity correlation of quasars, we simultaneously place limits on the curvature parameter ΩK and the parameters characterizing the luminosity correlation function. This model-independent analysis suggests that a mildly closed universe ( ) is preferred at the 2.1σ level. With the calibrated luminosity correlation, we build a new data set consisting of 1598 quasar distance moduli, and use these calibrated measurements to test and compare the standard ΛCDM model and the Rh?=?ct universe. Both models account for the data very well, though the optimized flat ΛCDM model has one more free parameter than Rh?=?ct, and is penalized more heavily by the Bayes Information Criterion. We find that Rh?=?ct is slightly favored over ΛCDM with a likelihood of ~57.7% versus 42.3%.
KeywordQuasars Cosmological parameters Cosmological models Distance indicators Observational cosmology
WOS IDIOP:0004-637X-888-2-ab5e7d
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210033, People's Republic of China;
2.Guangxi Key Laboratory for Relativistic Astrophysics, Guangxi University, Nanning 530004, People's Republic of China
3.University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
4.Department of Physics, The Applied Math Program, and Department of Astronomy, The University of Arizona, Tucson, AZ 85721, USA;
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Wei,Jun-Jie,Melia,Fulvio. Model-independent Distance Calibration and Curvature Measurement Using Quasars and Cosmic Chronometers[J]. The Astrophysical Journal,2020,888(2).
APA Wei,Jun-Jie,&Melia,Fulvio.(2020).Model-independent Distance Calibration and Curvature Measurement Using Quasars and Cosmic Chronometers.The Astrophysical Journal,888(2).
MLA Wei,Jun-Jie,et al."Model-independent Distance Calibration and Curvature Measurement Using Quasars and Cosmic Chronometers".The Astrophysical Journal 888.2(2020).
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