Using quasar X-ray and UV flux measurements to test the cosmic opacity with cosmography

Xu, Bing; Zhang, Kaituo; Huang, Qihong; Chen, Bing; Li, Yong

doi:10.1016/j.dark.2021.100875

Cited by 2 publications

(2 citation statements)

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“…In this work, we adopt two different catalogs of data, standard candles and standard rulers, to determine how different samples affect the estimation of cosmological parameters. Here, we turn to a new standard candle compila-tion of 1598 quasars from X-ray and UV flux measurements with a redshift range 0.036 ≤ z ≤ 5.1003 [26], which has become an effective probe to investigate different cosmological parameters [27][28][29][30] especially the cosmic curvature Ω k [31,32], and the cosmic distance duality relation [33,34] in the early universe (z ∼ 5). Besides, the newest SNe Ia sample " Pantheon" consists of 1048 points spanning a redshift range 0.01 ≤ z ≤ 2.3 [35], is also adopted in our work as a standard candle.…”

Section: Introductionmentioning

confidence: 99%

Revisiting Chaplygin gas cosmologies with the recent observations of high-redshift quasars

et al. 2022

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In this paper, we use the latest observations of quasars covering the redshift range of $$0.04<z<5.1$$ 0.04 < z < 5.1 to investigate a series of Chaplygin gas models as candidates for unified dark matter and dark energy. Based on different combinations of available standard candle and standard ruler data, we put constraints on the generalized Chaplygin gas (GCG), modified Chaplygin gas (MCG), new generalized Chaplygin gas (NGCG) and viscous generalized Chaplygin gas (VGCG) models. Moreover, we apply Jensen–Shannon divergence (JSD), statefinder diagnostics, and the deviance information criterion (DIC) to distinguish these CG models, based on the statistical results derived from Markov chain Monte Carlo method. The results show that (1) The standard ruler data could provide more stringent constraints on the cosmological parameters of different CG models considered in this analysis. Interestingly, the matter density parameter $$\varOmega _{m}$$ Ω m and Hubble constant $$H_{0}$$ H 0 derived from the available data are well consistent with those from the Planck 2018 results; (2) Based on the statistical criteria JSD, our findings demonstrate the well consistency between Chaplygin gas and the concordance $$\varLambda $$ Λ CDM model. However, in the framework of statefinder diagnostics, the GCG and NGCG models cannot be distinguished from $$\varLambda $$ Λ CDM, while MCG and VGCG models show significant deviation from $$\varLambda $$ Λ CDM in the present epoch; (3) According to the the statistical criteria DIC, we show that the MCG and VGCG models have substantial observational support from high-redshift quasars, whereas the GCG and NGCG models miss out on the less observational support category but can not be ruled out.

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Section: Introductionmentioning

confidence: 99%

Revisiting Chaplygin gas cosmologies with the recent observations of high-redshift quasars

et al. 2022

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“…Thus, the parameter of the CDDR can also be constrained by the parameterization function of optical depth τ(z) rather than η(z) with their relation being η(z) = e τ( z)/2 (Lima et al 2011). And many works have been made to perform the constraints on the cosmic opacity by using various astronomical observations, and the results show that there is no obvious evidence of an opaque universe (More et al 2009;Chen et al 2012;Nair et al 2012;Holanda et al 2013;Liao et al 2013Liao et al , 2015Wang et al 2017;Qi et al 2019b;Ma et al 2019;Wei 2019;Fu et al 2020;Geng et al 2020;Liu et al 2020;Xu et al 2021;He et al 2022). However, it is worth mentioning that combining the simulated gravitation waves from the DECi-hertz Interferometer Gravitational-wave Observatory and the Einstein Telescope (ET) with the observations of SNIa, H II galaxies, and monochromatic X-ray and ultraviolet (UV) luminosity of quasars, the authors in the references (Geng et al 2020;Liu et al 2020) have tested the cosmic opacity out to high redshifts and found that the constraint results are slightly sensitive to the parameterization of τ(z).…”

Section: Introductionmentioning

confidence: 99%

Model-independent Test for the Cosmic Distance–Duality Relation with Pantheon and eBOSS DR16 Quasar Sample

Wang

Zhang

et al. 2022

ApJ

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In this Paper, we carry out a new model-independent cosmological test for the cosmic distance–duality relation (CDDR) by combining the latest five baryon acoustic oscillation (BAO) measurements and the Pantheon type Ia supernova (SNIa) sample. Particularly, the BAO measurement from the extended Baryon Oscillation Spectroscopic Survey data release 16 quasar sample at effective redshift z = 1.48 is used, and two methods, i.e., a compressed form of the Pantheon sample and the artificial neural network combined with the binning SNIa method, are applied to overcome the redshift-matching problem. Our results suggest that the CDDR is compatible with the observations, and the high-redshift BAO and SNIa data can effectively strengthen the constraints on the violation parameters of CDDR with the confidence interval decreasing by more than 20%. In addition, we find that the compressed form of observational data can provide a more rigorous constraint on the CDDR, and thus can be generalized to the applications of other actual observational data with limited sample size in the test for CDDR.

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Using quasar X-ray and UV flux measurements to test the cosmic opacity with cosmography

Cited by 2 publications

References 58 publications

Revisiting Chaplygin gas cosmologies with the recent observations of high-redshift quasars

Revisiting Chaplygin gas cosmologies with the recent observations of high-redshift quasars

Model-independent Test for the Cosmic Distance–Duality Relation with Pantheon and eBOSS DR16 Quasar Sample

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