2020
DOI: 10.3847/1538-4357/abc25f
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Reaffirming the Cosmic Acceleration without Supernovae and the Cosmic Microwave Background

Abstract: Recent discussions about supernova magnitude evolution have raised doubts about the robustness of the late-universe acceleration. In a previous letter, Huang did a null test of the cosmic acceleration by using a Parameterization based on the cosmic Age (PAge), which covers a broad class of cosmological models including the standard Λ cold dark matter model and its many extensions. In this work, we continue to explore the cosmic expansion history with the PAge approximation. Using baryon acoustic oscillations (… Show more

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Cited by 23 publications
(19 citation statements)
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“…This fact inspires Refs. [50,51] to propose a global parametrization based on the cosmic age (PAge) by expanding the product Ht of the Hubble parameter H(t) and the cosmic time t to the quadratic order in t, namely, where the two free parameters p age and η characterize the deviation from the matter dominance combination Ht = 2/3 when the dark energy takes over the background expansion. Here the short period spent by the radiation dominated era is neglected.…”
Section: Modelmentioning
confidence: 99%
See 1 more Smart Citation
“…This fact inspires Refs. [50,51] to propose a global parametrization based on the cosmic age (PAge) by expanding the product Ht of the Hubble parameter H(t) and the cosmic time t to the quadratic order in t, namely, where the two free parameters p age and η characterize the deviation from the matter dominance combination Ht = 2/3 when the dark energy takes over the background expansion. Here the short period spent by the radiation dominated era is neglected.…”
Section: Modelmentioning
confidence: 99%
“…1, the Taylor expansions in z or y even up to the fifth order still largely distort the model that they are trying to approximate in the first place even for the ΛCDM model, hence fitting to the traditional Taylor expansion in z or y would be misleading for the BAO data considered to date. Fortunately, there is a global parametrization based on the cosmic age (PAge) [50,51] that are faithful in reproducing a large class of late-time models in a wide redshift range with a high accuracy. See also [52] for a more accurate parametrization based on cosmic age (MAPAge).…”
Section: Introductionmentioning
confidence: 99%
“…For a specific physical model, η and p age could be expressed by the model parameters. Mapping a specific model in the PAge parameter space requires matching the deceleration parameter q(t) at some characteristic time, for example, at redshift zero, as done in Table 1 of [115] for a large class of illustrative models, where the relative error for the PAge representation of ow CPL CDM model is less than 1% over 0 < z < 2.5. See Appendix B for more details on model matching.…”
Section: Modelmentioning
confidence: 99%
“…However, the Taylor expansions of H(z) in z or (1 − a) even to the fourth order still fail to cover the OHD redshift with the modest accuracy even for the ΛCDM case. We therefore propose in this paper to use a global parameterization based on the cosmic age (PAge) [114,115] that not only reproduces ΛCDM up to high redshift with high accuracy but also covers a large class of late-time models in a wide redshift range with a high accuracy. Furthermore, it is logically more consistent to use PAge for OHD from the cosmic chronometer (CC), and the cosmic age was recently found to play an important role in the Hubble tension [116][117][118][119].…”
Section: Introductionmentioning
confidence: 99%
“…Because the sound horizon can be calculated rather simply from basic assumptions of the pre-recombination plasma, they provide a standard ruler which can be seen in the clustering of large scale structures. This provides an independent way to probe cosmological parameters, complimentary to this of the Supernova and the CMB surveys, see ( [23][24][25] ). The BAO peak can be measured from objects with different nature and using different methods.…”
Section: Overview Of the Used Datasetsmentioning
confidence: 99%