Abstract
We test the anisotropy in the Finslerian cosmological model with the X-ray and ultraviolet (UV) fluxes of quasars. The 2015 and 2020 compilations of quasars are used in the cosmological constraints. We find that the dipole direction given by the 2015 quasar compilation is not far away from the one provided by the Pantheon sample and the angular differences are around 30^{circ }. The Pantheon sample is combined with quasars as the “standardized candles” to test the cosmic anisotropy. The results from two combined datasets are consistent. They show that the dipole anisotropy is weak in the Finslerian cosmological model. We investigate the Hubble constant H_0 in the Finslerian cosmological model. Though the central value of H_0 from the combination of six gravitationally lensed quasars, Pantheon sample, and 2020 quasar compilation decreases a little bit, it is consistent with the result from six gravitationally lensed quasars within statistical uncertainties.
Highlights
As the most luminous and persistent energy source, quasars have extraordinary potential in the exploration of our Universe
Though the dipole anisotropy is well-constrained by the 2015 quasar compilation, the matter density Ωm and its uncertainty are very large compared to the estimates given by the Cosmic Microwave Background (CMB) and supernovae of type Ia (SNe Ia)
We found that the dipole direction given by the 2015 quasar compilation is not far away from the one given by the Pantheon sample in the Finslerian cosmological model and the angular difference is around 30◦
Summary
As the most luminous and persistent energy source, quasars have extraordinary potential in the exploration of our Universe. We will use two quasars datasets i.e., the 2015 [37] and 2020 [39] quasar compilation to explore the anisotropy in the Finslerian cosmological model. The 2015 quasar compilation contains 808 quasars which are thought to be standardizable candles through the relation between UV and X-ray luminosity. In the 2020 quasar compilation, the 2500 Å UV fluxes for the quasars in the redshift range z < 0.7 are less reliable due to the host-galaxy contamination [39]. We attempt to investigate the Hubble constant H0 in the Finslerian cosmological model by using six gravitationally lensed quasars with measured time delays [48]. 2, we briefly introduce the UV and X-ray luminosity relationship, the time-delay strong lensing measurement, and the Finslerian cosmological model.
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