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- W3103441762 abstract "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%." @default.
- W3103441762 created "2020-11-23" @default.
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- W3103441762 date "2020-01-14" @default.
- W3103441762 modified "2023-09-25" @default.
- W3103441762 title "Model-independent Distance Calibration and Curvature Measurement Using Quasars and Cosmic Chronometers" @default.
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- W3103441762 doi "https://doi.org/10.3847/1538-4357/ab5e7d" @default.
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