Binned Hubble parameter measurements and the cosmological deceleration–acceleration transition

Farooq, Omer; Crandall, Sara

doi:10.1016/j.physletb.2013.08.078

Cited by 87 publications

(45 citation statements)

References 82 publications

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“…Following the method of Ref. 54, we firstly use the 28 independent OHD data points to constrain cosmological model parameters and then present the results for a combined analysis of other observational tests. Basically, the model parameters are determined by minimizing…”

Section: The Constraint Resultsmentioning

confidence: 99%

INTERACTION BETWEEN DARK ENERGY AND DARK MATTER: OBSERVATIONAL CONSTRAINTS FROM OHD, BAO, CMB AND SNe Ia

Cao

Liang

2013

Int. J. Mod. Phys. D

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In order to test if there is energy transfer between dark energy and dark matter, we investigate cosmological constraints on two forms of nontrivial interaction between the dark matter sector and the sector responsible for the acceleration of the universe, in light of the newly revised observations including OHD, CMB, BAO and SNe Ia. More precisely, we find the same tendencies for both phenomenological forms of the interaction term Q = 3γHρ, i.e., the parameter γ to be a small number, |γ| ≈ 10 −2 . However, concerning the sign of the interaction parameter, we observe that γ > 0 when the interaction between dark sectors is proportional to the energy density of dust matter, whereas the negative coupling (γ < 0) is preferred by observations when the interaction term is proportional to dark energy density. We further discuss two possible explanations to this incompatibility and apply a quantitative criteria to judge the severity of the coincidence problem. Results suggest that the γmIDE model with a positive coupling may alleviate the coincidence problem, since its coincidence index C is smaller than that for the γ d IDE model, the interacting quintessence and phantom models by four orders of magnitude.

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Section: The Constraint Resultsmentioning

confidence: 99%

INTERACTION BETWEEN DARK ENERGY AND DARK MATTER: OBSERVATIONAL CONSTRAINTS FROM OHD, BAO, CMB AND SNe Ia

Cao

Liang

2013

Int. J. Mod. Phys. D

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“…These equations are numerically integrated to provide H(z) in the fCDM model Samushia 2009;Farooq 2013). …”

Section: λCdm ωCdm and Fcdmmentioning

confidence: 99%

Determining the Hubble Constant From Hubble Parameter Measurements

Chen

Kumar

Ratra

2017

ApJ

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140

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ABSTRACT1 Mpc −1 (1σ errors) in the ΛCDM (spatially flat and non-flat), ωCDM, and fCDM models, respectively. These measured H 0 values are more consistent with the lower values determined from recent data on the cosmic microwave background and baryon acoustic oscillations, as well as with the value found from a median statistical analysis of Huchra's compilation of H 0 measurements, but include the higher local measurements of H 0 within the 2σ confidence limits.

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“…But the observed transition redshift lies somewhere between 1 2 and 1 (cp. [32]) which, at least for the CDM model, corresponds to a luminosity distance of the order of the Hubble radius (cp. Fig.…”

Section: Connection With the Nonrelativistic Darkon Fluid Cosmologymentioning

confidence: 99%

General relativistic, nonstandard model for the dark sector of the Universe

Stichel

Zakrzewski

2015

Eur. Phys. J. C

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We present a general relativistic version of the self-gravitating fluid model for the dark sector of the Universe (darkon fluid) introduced in Stichel and Zakrzewski (Phys Rev D 80:083513, 2009) and extended and reviewed in Stichel and Zakrzewski (Entropy 15:559, 2013). This model contains no free parameters in its Lagrangian. The resulting energy-momentum tensor is dustlike with a nontrivial energy flow. In an approximation valid at sub-Hubble scales we find that the present-day cosmic acceleration is not attributed to any kind of negative pressure but it is due to a dynamically determined negative energy density. This property turns out to be equivalent to a time-dependent spatial curvature. The obtained cosmological equations, at sub-Hubble scales, agree with those of the nonrelativistic model but they are given a new physical interpretation. Furthermore, we have derived the self-consistent equation to be satisfied by the nonrelativistic gravitational potential produced by a galactic halo in our model from a weak-field limit of a generalized TolmanOppenheimer-Volkoff equation.

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Binned Hubble parameter measurements and the cosmological deceleration–acceleration transition

Cited by 87 publications

References 82 publications

INTERACTION BETWEEN DARK ENERGY AND DARK MATTER: OBSERVATIONAL CONSTRAINTS FROM OHD, BAO, CMB AND SNe Ia

INTERACTION BETWEEN DARK ENERGY AND DARK MATTER: OBSERVATIONAL CONSTRAINTS FROM OHD, BAO, CMB AND SNe Ia

Determining the Hubble Constant From Hubble Parameter Measurements

General relativistic, nonstandard model for the dark sector of the Universe

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