Ultra-compact structure in intermediate-luminosity radio quasars: building a sample of standard cosmological rulers and improving the dark energy constraints up to <i>z </i>~ 3

Cao, Shuo; Zheng, Xiaogang; Biesiada, Marek; Qi, Jing-Zhao; Chen, Yun; Zhu, Zong-Hong

doi:10.1051/0004-6361/201730551

Cited by 127 publications

(211 citation statements)

References 86 publications

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“…On the one hand, the present value of the matter density parameter m given by quasars is much larger than that derived from other observations. This has been noted by our previous analysis of Cao et al [29] and the first-year Planck results, in the framework of CDM cosmology. Such a result indicates that quasar data at high redshifts may provide us a different understanding of the parameters describing the components of the Universe.…”

Section: Observational Constraintssupporting

confidence: 77%

“…The final results indicated that intermediate-luminosity quasars show negligible dependence on both redshifts z and intrinsic luminosity L, which makes them a fixed comoving-length standard ruler. More recently, based on a cosmologicalmodel-independent method to calibrate the linear sizes l m of intermediate-luminosity quasars, Cao et al [29] investigated the cosmological application of this data set and obtained stringent constraints on both the matter density m and the Hubble constant H 0 , which agree very well with the recent Planck results. The advantage of this data set, compared with other standard rulers, BAO [30][31][32], clusters [33], strong lensing systems [34][35][36]), is that quasars are observed at much higher redshifts (z ∼ 3.0).…”

Section: Introductionmentioning

confidence: 56%

“…The data used in this paper were derived from an old 2.29 GHz VLBI survey undertaken by Preston et al (1985), which contains 613 milliarcsecond ultra-compact radio sources covering the redshift range 0.0035 < z < 3.787. More recently, Cao et al [29] presented a method to identify a sub-sample which can serve as a certain class of individual standard rulers in the Universe. According to the optical counterparts and luminosities, the full sample could be divided into three sub-samples: low-luminosity quasars (L < 10 27 W/Hz), intermediateluminosity quasars (10 27 W/Hz < L < 10 28 W/Hz) and high-luminosity quasars (L > 10 28 W/Hz).…”

Section: Quasars Datamentioning

confidence: 99%

“…In our analysis, we will use the observations of 120 intermediate-luminosity quasars covering the redshift range 0.46 < z < 2.80, while the linear size of this standard ruler is calibrated to l = 11.03 pc through a new cosmologyindependent technique [29].…”

Section: Quasars Datamentioning

confidence: 99%

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New observational constraints on f(T) cosmology from radio quasars

Cao

Biesiada

et al. 2017

Eur. Phys. J. C

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Using a new recently compiled milliarcsecond compact radio data set of 120 intermediate-luminosity quasars in the redshift range 0.46 < z < 2.76, whose statistical linear sizes show negligible dependence on redshifts and intrinsic luminosity and thus represent standard rulers in cosmology, we constrain three viable and most popular f (T ) gravity models, where T is the torsion scalar in teleparallel gravity. Our analysis reveals that constraining power of the quasars data (N = 120) is comparable to the Union2.1 SN Ia data (N = 580) for all three f (T ) models. Together with other standard ruler probes such as cosmic microwave background and baryon acoustic oscillation distance measurements, the present value of the matter density parameter m obtained by quasars is much larger than that derived from other observations. For one of the models considered ( f 1 CDM) a small but noticeable deviation from CDM cosmology is present, while in the framework of f 3 CDM the effective equation of state may cross the phantom divide line at lower redshifts. These results indicate that intermediateluminosity quasars could provide an effective observational probe comparable to SN Ia at much higher redshifts, and f (T ) gravity is a reasonable candidate for the modified gravity theory.

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Section: Observational Constraintssupporting

confidence: 77%

Section: Introductionmentioning

confidence: 56%

Section: Quasars Datamentioning

confidence: 99%

Section: Quasars Datamentioning

confidence: 99%

See 2 more Smart Citations

New observational constraints on f(T) cosmology from radio quasars

Cao

Biesiada

et al. 2017

Eur. Phys. J. C

Self Cite

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“…Pioneer work using these data was also performed in Ref. [39] to probe a flat CDM model and the XCDM model, in which the linear size of this standard ruler was calibrated as l m = 11.03 pc through a cosmological-model-independent method. As complementary to other cosmological standard rods, such as BAO and galaxy clusters [40], quasars are promising objects for studying the expansion rate of the Universe at much higher redshift, and thus they have become an effective probe in cosmology and astrophysics [20,39].…”

Section: Introductionmentioning

confidence: 99%

Testing and selecting cosmological models with ultra-compact radio quasars

Cao

Zheng

et al. 2017

Eur. Phys. J. C

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In this paper, we place constraints on four alternative cosmological models under the assumption of the spatial flatness of the Universe: CPL, EDE, GCG and MPC. A new compilation of 120 compact radio quasars observed by very-long-baseline interferometry, which represents a type of new cosmological standard rulers, are used to test these cosmological models. Our results show that the fits on CPL obtained from the quasar sample are well consistent with those obtained from BAO. For other cosmological models considered, quasars provide constraints in agreement with those derived with other standard probes at 1σ confidence level. Moreover, the results obtained from other statistical methods including figure of merit, Om(z) and statefinder diagnostics indicate that: (1) Radio quasar standard ruler could provide better statistical constraints than BAO for all cosmological models considered, which suggests its potential to act as a powerful complementary probe to BAO and galaxy clusters. (2) Turning to Om(z) diagnostics, CPL, GCG and EDE models cannot be distinguished from each other at the present epoch. (3) In the framework of statefinder diagnostics, MPC and EDE will deviate from the CDM model in the near future, while GCG model cannot be distinguished from the CDM model unless much higher precision observations are available.

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A new way to test the WIMP dark matter models

Cheng

Diao

et al. 2021

J. High Energ. Phys.

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In this paper, we investigate the possibility of testing the weakly interacting massive particle (WIMP) dark matter (DM) models by applying the simplest phenomenological model which introduces an interaction term between dark energy (DE) and WIMP DM, i.e., Q = 3γDMHρDM. In general, the coupling strength γDE is close to 0 as the interaction between DE and WIMP DM is very weak, thus the effect of γDE on the evolution of Y associated with DM energy density can be safely neglected. Meanwhile, our numerical calculation also indicates that xf ≈ 20 is associated with DM freeze-out temperature, which is the same as the vanishing interaction scenario. As for DM relic density, it will be magnified by $$ \frac{2-3{\upgamma}_{\mathrm{DM}}}{2}{\left[2\pi {g}_{\ast }{m}_{\mathrm{DM}}^3/\left(45{s}_0{x}_f^3\right)\right]}^{\gamma_{\mathrm{DM}}} $$ 2 − 3 γ DM 2 2 π g ∗ m DM 3 / 45 s 0 x f 3 γ DM times, which provides a new way to test WIMP DM models. As an example, we analyze the case in which WIMP DM is a scalar DM. (SGL+SNe+Hz) and (CMB+BAO+SNe) cosmological observations will give γDM = $$ {0.134}_{-0.069}^{+0.17} $$ 0.134 − 0.069 + 0.17 and γDM = −0.0008 ± 0.0016, respectively. After further considering the constraints from DM direct detection experiment, DM indirect detection experiment, and DM relic density, we find that the allowed parameter space of the scalar DM model will be completely excluded for the former cosmological observations, while it will increase for the latter ones. Those two cosmological observations lead to an almost paradoxical conclusion. Therefore, one could expect more stringent constraints on the WMIP DM models, with the accumulation of more accurate cosmological observations in the near future.

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Ultra-compact structure in intermediate-luminosity radio quasars: building a sample of standard cosmological rulers and improving the dark energy constraints up to z ~ 3

Cited by 127 publications

References 86 publications

New observational constraints on f(T) cosmology from radio quasars

New observational constraints on f(T) cosmology from radio quasars

Testing and selecting cosmological models with ultra-compact radio quasars

A new way to test the WIMP dark matter models

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