Alcock–Paczyński test with model-independent BAO data

Melia, Fulvio; López-Corredoira, Martín

doi:10.1142/s0218271817500559

Cited by 37 publications

(34 citation statements)

References 47 publications

(22 reference statements)

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“…The observed value for Y at three redshifts are Y (z = 0.38) = 1.079 ± 0.042, Y (z = 0.61) = 1.248 ± 0.044 [64] and Y (z = 2.34) = 1.706 ± 0.083 [65]. The upper panel of Fig.…”

Section: Alcock-paczynski Testmentioning

confidence: 86%

Non-minimal derivative coupling scalar field and bulk viscous dark energy

2017

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Inspired by thermodynamical dissipative phenomena, we consider bulk viscosity for dark fluid in a spatially flat two-component Universe. Our viscous dark energy model represents phantom-crossing which avoids bigrip singularity. We propose a non-minimal derivative coupling scalar field with zero potential leading to accelerated expansion of the Universe in the framework of bulk viscous dark energy model. In this approach, the coupling constant, κ, is related to viscosity coefficient, γ , and the present dark energy density, Ω 0 DE . This coupling is bounded as. We implement recent observational data sets including a joint light-curve analysis (JLA) for SNIa, gamma ray bursts (GRBs) for most luminous astrophysical objects at high redshifts, baryon acoustic oscillations (BAO) from different surveys, Hubble parameter from HST project, Planck CMB power spectrum and lensing to constrain model free parameters. The joint analysis of JLA + GRBs + BAO + HST shows that Ω 0 DE = 0.696 ± 0.010, γ = 0.1404 ± 0.0014 and H 0 = 68.1 ± 1.3. Planck TT observation provides γ = 0.32 +0.31 −0.26 in the 68% confidence limit for the viscosity coefficient. The cosmographic distance ratio indicates that current observed data prefer to increase bulk viscosity. The competition between phantom and quintessence behavior of the viscous dark energy model can accommodate cosmological old objects reported as a sign of age crisis in the ΛCDM model. Finally, tension in the Hubble parameter is alleviated in this model. a

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“…The observed value for Y at three redshifts are Y (z = 0.38) = 1.079 ± 0.042, Y (z = 0.61) = 1.248 ± 0.044 [64] and Y (z = 2.34) = 1.706 ± 0.083 [65]. The upper panel of Fig.…”

Section: Alcock-paczynski Testmentioning

confidence: 86%

Non-minimal derivative coupling scalar field and bulk viscous dark energy

2017

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“…This comparison has been performed using the fitted parameters of the models (see Table 1). According to the y(0.38) = 1.079 ± 0.042, y(z = 0.61) = 1.248 ± 0.044 and y(z = 2.34) = 1.706 ± 0.083 [86] the CDM is not favor by the BAO data while we choose the CDM as the model of comparison. The evolution of Alcock-Paczynski for CDM, HDE, THDE and ITHDE in terms of redshift is plotted in Figs.…”

Section: Alcock-paczynski Testmentioning

confidence: 99%

Observational constraints on interacting Tsallis holographic dark energy model

Sadri

2019

Eur. Phys. J. C

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In this paper, we investigate a recent proposed model -so called the Tsallis holographic dark energy (THDE) model with consideration of the Hubble and the event future horizon as IR cutoffs. In this case, we consider the non-gravitational and phenomenological interaction between dark sectors. We fit the free parameters of the model using Pantheon Supernovae Type Ia data, Baryon Acoustic Oscillations, Cosmic Microwave Background, Gamma-Ray burst and the the local value of the Hubble constant. We examine the THDE model to check its compatibility with observational data using objective Information Criterion (IC). We find that the THDE models cannot be supported by observational data once the CDM is considered as the referring model. Therefore we re-examine the analysis with the standard holographic dark energy model (HDE) as another reference. Changing the CDM to main standard dark energy model (HDE), we observe the compatibility of the THDE models. Using the Alcock-Paczynski (AP) test we check the deviation of the model compared to CDM and HDE. Surveying the evolution of squared of sound speed v 2 s as an another test we check the stability of the interacting and non-interacting THDE models and we find that while the THDE model with the Hubble horizon as IR cutoff is unstable against the background perturbation, the future event horizon as IR cutoff show stability at the late time. In addition, using the modified version of the CAMB package, we observe the suppressing the CMB spectrum at small K-modes and large scale.Eur. Phys. J. C

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“…The rest were excluded at a > 95% confidence level. Analyses with further data using Baryonic Acoustic Oscillations (BAO) [125] improve the test and give us a more accurate constraint: ΛCDM with standard values of parameters is excluded at 98% C.L., whereas static with tired light fits the data, but also an expanding Universe with zero-active mass or wCDM with ω dark energy = −0.60…”

Section: Alcock-paczyńskimentioning

confidence: 99%

Tests and Problems of the Standard Model in Cosmology

López-Corredoira

2017

Preprint

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The main foundations of the standard ΛCDM model of cosmology are that: 1) The redshifts of the galaxies are due to the expansion of the Universe plus peculiar motions; 2) The cosmic microwave background radiation and its anisotropies derive from the high energy primordial Universe when matter and radiation became decoupled; 3) The abundance pattern of the light elements is explained in terms of primordial nucleosynthesis; and 4) The formation and evolution of galaxies can be explained only in terms of gravitation within a inflation+dark matter+dark energy scenario. Numerous tests have been carried out on these ideas and, although the standard model works pretty well in fitting many observations, there are also many data that present apparent caveats to be understood with it. In this paper, I offer a review of these tests and problems, as well as some examples of alternative models.Keywords Cosmology · Observational cosmology · Origin, formation, and abundances of the elements · dark matter · dark energy · superclusters and large-scale structure of the Universe

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Alcock–Paczyński test with model-independent BAO data

Cited by 37 publications

References 47 publications

Non-minimal derivative coupling scalar field and bulk viscous dark energy

Non-minimal derivative coupling scalar field and bulk viscous dark energy

Observational constraints on interacting Tsallis holographic dark energy model

Tests and Problems of the Standard Model in Cosmology

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