2,424 research outputs found
Reexploration of interacting holographic dark energy model: Cases of interaction term excluding the Hubble parameter
In this paper, we make a deep analysis for the five typical interacting
holographic dark energy models with the interaction terms , , , , and , respectively.
We obtain observational constraints on these models by using the type Ia
supernova data (the Joint Light-curve Analysis sample), the cosmic microwave
background data (Planck 2015 distance priors), the baryon acoustic oscillations
data, and the direct measurement of the Hubble constant. We find that the
values of for all the five models are almost equal
(around~699), indicating that the current observational data equally favor
these IHDE models. In addition, a comparison with the cases of interaction term
involving the Hubble parameter is also made.Comment: 14 pages, 6 figures. arXiv admin note: text overlap with
arXiv:1710.0306
No evidence for the evolution of mass density power-law index from strong gravitational lensing observation
In this paper, we consider the singular isothermal sphere lensing model that
has a spherically symmetric power-law mass distribution . We investigate whether the mass density power-law index
is cosmologically evolutionary by using the strong gravitational lensing (SGL)
observation, in combination with other cosmological observations. We also check
whether the constraint result of is affected by the cosmological
model, by considering several simple dynamical dark energy models. We find that
the constraint on is mainly decided by the SGL observation and
independent of the cosmological model, and we find no evidence for the
evolution of from the SGL observation.Comment: 7 pages, 3 figure
- …