Hubble Parameter Measurement Constraints on Dark Energy

Farooq, Omer; Mania, Data; Ratra, Bharat

doi:10.1088/0004-637x/764/2/138

Cited by 89 publications

(129 citation statements)

References 102 publications

(117 reference statements)

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“…[34] analyzed the information of Hubble parameter at redshift z = 0.24 and z = 0.43 from the Sloan Digital Sky Survey (SDSS) DR6 and DR7 data. Recently, these H(z) data have been widely used on the determination of cosmological parameters, such as the effective number of neutrinos [35,36], the equation of state of dark energy [37][38][39], the cosmography scenario [40,41], and the modified gravity models [42][43][44].…”

Section: B Hubble Measurementsmentioning

confidence: 99%

Constraints on cosmic distance duality relation from cosmological observations

Xia

2016

Physics of the Dark Universe

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In this paper, we use the model dependent method to revisit the constraint on the well-known cosmic distance duality relation (CDDR). By using the latest SNIa samples, such as Union2.1, JLA and SNLS, we find that the SNIa data alone can not constrain the cosmic opacity parameter ε, which denotes the deviation from the CDDR, 2+ε , very well. The constraining power on ε from the luminosity distance indicator provided by SNIa and GRB is hardly to be improved at present. When we include other cosmological observations, such as the measurements of Hubble parameter, the baryon acoustic oscillations and the distance information from cosmic microwave background, we obtain the tightest constraint on the cosmic opacity parameter ε, namely the 68% C.L. limit: ε = 0.023 ± 0.018. Furthermore, we also consider the evolution of ε as a function of z using two methods, the parametrization and the principle component analysis, and do not find the evidence for the deviation from zero. Finally, we simulate the future SNIa and Hubble measurements and find the mock data could give very tight constraint on the cosmic opacity ε and verify the CDDR at high significance.

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Section: B Hubble Measurementsmentioning

confidence: 99%

Constraints on cosmic distance duality relation from cosmological observations

Xia

2016

Physics of the Dark Universe

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“…where N H(z) = 21, H th (z i ; p) is the theoretical Hubble parameter and H obs are the 21 observed Hubble parameters at the observed redshift z i [80][81][82][83] (see Table 1 of [84]). Furthermore we use the 6dF, the SDSS and WiggleZ BAO data [85,86] for which the corresponding chi-square is…”

Section: Observational Constraintsmentioning

confidence: 99%

Dynamical symmetries and observational constraints in scalar field cosmology

2014

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We propose to use dynamical symmetries of the field equations, in order to classify the dark energy models in the context of scalar field (quintessence or phantom) FLRW cosmologies. Practically, symmetries provide a useful mathematical tool in physical problems since they can be used to simplify a given system of differential equations as well as to determine the integrability of the physical system. The requirement that the field equations admit dynamical symmetries results in two potentials one of which is the well known Unified Dark Matter (UDM) potential and another new potential. For each hyperbolic potential we obtain the corresponding analytic solution of the field equations. The proposed analysis suggests that the requirement of the contact symmetry appears to be very competitive to other independent tests used to probe the functional form of a given potential and thus the associated nature of dark energy. Finally, in order to test the viability of the above scalar field models we perform a joint likelihood analysis using some of the latest cosmological data.PACS numbers: 98.80.-k, 95.35.+d, 95.36.+x

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“…In recent years H(z) measurements of the Hubble parameter have been used to constrain several cosmological parameters [58,59,60,61,62,63]. In this paper, we use 19 H(z) measurements from cosmic chonometers [58,59,62] plus 7 H(z) measurements from baryon acoustic oscillations (BAOs) [64,65,66,67,68] in the redshift range 0 < z < 2.3.…”

Section: B H(z) Measurementsmentioning

confidence: 99%

Probing cosmic opacity at high redshifts with gamma-ray bursts

Holanda

Busti

2014

Phys. Rev. D

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Probing the evolution of the universe at high redshifts with standard candles is a powerful way to discriminate dark energy models, where an open question nowadays is whether this component is constant or evolves with time. One possible source of ambiguity in this kind of analyses comes from cosmic opacity, which can mimick a dark enery behaviour. However, most tests of cosmic opacity have been restricted to the redshift range z < 2. In this work, by using luminosity distances of gamma-ray bursts (GRBs), given the validity of the Amati relation, and the latest H(z) data we determine constraints on the cosmic opacity at high redshifts (z > 2) for a flat ΛCDM model. A possible degenerescence of the results with the adopted cosmological model is also investigated by considering a flat XCDM model. The limits on cosmic opacity in the redshift range 0 < z < 2 are updated with type Ia supernovae (SNe Ia) from the Union2.1 sample, where we added the most distant (z = 1.713) spectroscopically confirmed SNe Ia. From the analyses performed, we find that both SNe Ia and GRBs samples are compatible with a transparent universe at 1σ level and the results are independent of the dark energy equation of state parameter w.

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Hubble Parameter Measurement Constraints on Dark Energy

Cited by 89 publications

References 102 publications

Constraints on cosmic distance duality relation from cosmological observations

Constraints on cosmic distance duality relation from cosmological observations

Dynamical symmetries and observational constraints in scalar field cosmology

Probing cosmic opacity at high redshifts with gamma-ray bursts

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