Galaxy cluster angular-size data constraints on dark energy

Chen, Y.; Ratra, Bharat

doi:10.1051/0004-6361/201117944

Cited by 24 publications

(20 citation statements)

References 98 publications

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“…Other measurements that have been used to constrain cosmological parameters include, for example, galaxy cluster gas mass fraction as a function of redshift e.g., Allen et al, 2 Samushia & Ratra, 152 Tong et al, 171 Lu et al, 103 Landry et al, 92 galaxy cluster and other large-scale structure properties Mortonson et al, 113 Devi et al, 38 Wang, 180 De Boni et al, 54 Batista et al, 13 and references therein, gamma-ray burst luminosity distance as a function of redshift e.g., Samushia & Ratra, 153 Wang & Dai, 177 Busti et al, 25 Pan et al 116 , HII starburst galaxy apparent magnitude as a function of redshift e.g., Plionis et al, 129,130 Mania & Ratra, 107 , angular size as a function of redshift e.g., Guerra et al, 75 Bonamente et al, 21 Chen & Ratra, 46 , and strong gravitational lensing Chae et al, 37 Lee & Ng, 93 Biesiada et al, 17 Suyu et al, 167 and references therein. 6 While the constraints from these data are typically less restrictive than those derived from the H(z), SNIa, CMB anisotropy, and BAO data, both types of measurements result in largely compatible constraints that generally support a currently accelerating cosmological expansion.…”

Section: Discussionmentioning

confidence: 99%

Observational constraints on dark energy cosmological model parameters

Farooq

2013

Preprint

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The expansion rate of the Universe changes with time, initially slowing (decelerating) when the universe was matter dominated, because of the mutual gravitational attraction of all the matter in it, and more recently speeding up (accelerating). A number of cosmological observations now strongly support the idea that the Universe is spatially flat (provided the dark energy density is at least approximately time independent) and is currently undergoing an accelerated cosmological expansion. A majority of cosmologists consider "dark energy" to be the cause of this observed accelerated cosmological expansion.The "standard" model of cosmology is the spatially-flat ΛCDM model. Although most predictions of the ΛCDM model are reasonably consistent with measurements, the ΛCDM model has some curious features. To overcome these difficulties, different Dark Energy models have been proposed. Two of these models, the XCDM parametrization and the slow rolling scalar field model φCDM, along with "standard" ΛCDM, with the generalization of XCDM and φCDM in non-flat spatial geometries are considered here and observational data are used to constrain their parameter sets.In this thesis, we start with a overview of the general theory of relativity, Friedmann's equations, and distance measures in cosmology. In the following chapters we explain how we can constrain the three above mentioned cosmological models using three data sets: measurements of the Hubble parameter H(z), Supernova (SN) apparent magnitudes, and the baryonic acoustic oscillations (BAO) peak length scale, as functions of redshift z. We then discuss constraints on the deceleration-acceleration transition redshift z da using unbinned and binned H(z) data. Finally, we incorporate the spatial curvature in the XCDM and φCDM model and determine observational constraints on the parameters of these expanded models.

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Section: Discussionmentioning

confidence: 99%

Observational constraints on dark energy cosmological model parameters

Farooq

2013

Preprint

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“…The observational data that we have studied here still can not distinguish whether dark energy is a time-independent cosmological constant or a time-varying dynamical component. The complementary cosmological probes, such as the strong gravitational lensing and angular diameter distance measurements of galaxy clusters [74], do not yet carry as much statistical weight as the SNe Ia, CMB, BAO and Hubble parameter data. Figure 3.…”

Section: Discussionmentioning

confidence: 99%

Constraints on a ϕCDM model from strong gravitational lensing and updated Hubble parameter measurements

Chen

Geng

Cao

et al. 2015

J. Cosmol. Astropart. Phys.

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Abstract:We constrain the scalar field dark energy model with an inverse power-law potential, i.e., V (φ) ∝ φ −α (α > 0), from a set of recent cosmological observations by compiling an updated sample of Hubble parameter measurements including 30 independent data points. Our results show that the constraining power of the updated sample of H(z) data with the HST prior on H 0 is stronger than those of the SCP Union2 and Union2.1 compilations. A recent sample of strong gravitational lensing systems is also adopted to confine the model even though the results are not significant. A joint analysis of the strong gravitational lensing data with the more restrictive updated Hubble parameter measurements and the Type Ia supernovae data from SCP Union2 indicates that the recent observations still can not distinguish whether dark energy is a time-independent cosmological constant or a time-varying dynamical component.

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“…Also, Chen & Ratra (2012) examined constraints from the angular sizes of galaxy clusters, both for general FRW models and for two classes of flat models with different types of dark energy. Their conclusion is still valid today: such constraints are approximately as restrictive as those based on gammay-ray-burst apparent-luminosity data, strong-gravitational-lensing measurements, or the age of the Universe, but less so than those from BAO or the m-z relation for Type Ia supernovae (or the CMB).…”

Section: Classical Cosmology: Angular Diametersmentioning

confidence: 99%

Calculation of distances in cosmological models with small-scale inhomogeneities and their use in observational cosmology: a review

Helbig¹

2020

TheOJA

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The Universe is not completely homogeneous. Even if it is sufficiently so on large scales, it is very inhomogeneous at small scales, and this has an effect on light propagation, so that the distance as a function of redshift, which in many cases is defined via light propagation, can differ from the homogeneous case. Simple models can take this into account. I review the history of this idea, its generalization to a wide variety of cosmological models, analytic solutions of simple models, comparison of such solutions with exact solutions and numerical simulations, applications, simpler analytic approximations to the distance equations, and (for all of these aspects) the related concept of a 'Swiss-cheese' universe.

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Galaxy cluster angular-size data constraints on dark energy

Cited by 24 publications

References 98 publications

Observational constraints on dark energy cosmological model parameters

Observational constraints on dark energy cosmological model parameters

Constraints on a ϕCDM model from strong gravitational lensing and updated Hubble parameter measurements

Calculation of distances in cosmological models with small-scale inhomogeneities and their use in observational cosmology: a review

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