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

Abstract

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.

On the Phenomenology of an Accelerated Large-Scale Universe

“…Consideration of D(z l , z s ) allows one to eliminate uncertainty between the stellar velocity dispersion σ 0 and the velocity dispersion of the singular isothermal sphere/ellipsoid [101][102][103][104] (and references therein which can provide additional references to dark energy models, interaction in modern cosmology, modified theories of gravity, etc.). One can involve various geometrical tools like statefinder analysis with r =˙ä aH 3 and s = r−1 3(q−1/2) parameters, (ω de , ω de ), Om, Om3 and statefinder hierarchy analysis to study cosmological models.…”

Viscous cosmology for early- and late-time universe

“…However, as an unorthodox idea we may mention here the probability for producing larger viscosity via dark matter particles decaying into relativistic products [89]. Additionally, the comparison between the magnitude of bulk viscosity and astronomical observations were also performed in a recent paper by Normann and Brevik [71], using the analyses of various experimentally-based sources [90,91]. Various ansatzes for the bulk viscosity were analyzed: (i) ζ =constant, (ii) ζ ∝ √ ρ, and (iii) ζ ∝ ρ.…”

Hubble Parameter Measurement Constraints on the Redshift of the Deceleration–acceleration Transition, Dynamical Dark Energy, and Space Curvature

“…This has resulted in the first mapping out of the cosmological deceleration-acceleration transition, the epoch when dark energy took over from nonrelativistic matter, and the first measurement of the redshift of this transition (see, e.g., Moresco et al 2016). 4 H(z) measurements have also been used to constrain some more conventional cosmological parameters, such as the density of dark energy and the density of nonrelativistic matter (see, e.g., Samushia & Ratra 2006;Chen & Ratra 2011b;Chimento & Richarte 2013;Ferreira et al 2013;Akarsu et al 2014;Bamba et al 2014;Capozziello et al 2014;Dankiewicz et al 2014;Forte 2014;Gruber & Luongo 2014;Chen et al 2015;Meng et al 2015;Alam et al 2016;Guo & Zhang 2016;Mukherjee & Banerjee 2016), typically providing constraints comparable to or better than those provided by SN Ia data, but not as good as those from BAO or CMB anisotropy measurements. More recently, H(z) data have been used to measure the Hubble constant H 0 (Verde et al 2014;Chen et al 2016a), with the resulting H 0 value being more consistent with recent lower values determined from a median statistics analysis of Huchra's H 0 compilation (Chen & Ratra 2011a), from CMB anisotropy data (Hinshaw et al 2013;Sievers et al 2013;Ade et al 2015), from BAO measurements (Aubourg et al 2015;Ross et al 2015;L'Huillier & Shafieloo 2016), and from current cosmological data and the standard model of particle physics with only three light neutrino species (see, e.g., Calabrese et al 2012).…”