104 research outputs found
Dark energy, matter creation and curvature
The most studied way to explain the current accelerated expansion of the
universe is to assume the existence of dark energy; a new component that fill
the universe, does not clumps, currently dominates the evolution, and has a
negative pressure. In this work I study an alternative model proposed by Lima
et al. \cite{lima96}, which does not need an exotic equation of state, but
assumes instead the existence of gravitational particle creation. Because this
model fits the supernova observations as well as the CDM model, I
perform in this work a thorough study of this model considering an explicit
spatial curvature. I found that in this scenario we can alleviate the cosmic
coincidence problem, basically showing that these two components, dark matter
and dark energy, are of the same nature, but they act at different scales. I
also shown the inadequacy of some particle creation models, and also I study a
previously propose new model that overcome these difficulties.Comment: 6 pages, 4 figures. Accepted for publication in EPJC. arXiv admin
note: substantial text overlap with arXiv:0812.386
Asymmetry in the reconstructed deceleration parameter
We study the orientation dependence of the reconstructed deceleration
parameter as a function of redshift. We use the Union 2 and Loss datasets, by
using the well known preferred axis discussed in the literature, finding the
best fit reconstructed deceleration parameter. We found that a low redshift
transition of the reconstructed is clearly absent in one direction and
amazingly sharp in the opposite one. We discuss the possibility that such a
behavior can be associated with large scale structures affecting the data.Comment: 9 pages, 12 figure
Testing cosmic acceleration for parameterizations using measurements in galaxy clusters
In this paper we study the cosmic acceleration for five dynamical dark energy
models whose equation of state varies with redshift. The cosmological
parameters of these models are constrained by performing a MCMC analysis using
mainly gas mass fraction, , measurements in two samples of galaxy
clusters: one reported by Allen et al. (2004), which consists of points
spanning the redshift range , and the other by Hasselfield et al.
(2013) from the Atacama Cosmology Telescope survey, which consists of data
points in the redshift range . In addition, we
perform a joint analysis with the measurements of the Hubble parameter ,
baryon acoustic oscillations and the cosmic microwave background radiation from
WMAP and Planck measurements to estimate the equation of state parameters. We
obtained that both samples provide consistent constraints on the
cosmological parameters. We found that the data is consistent at the
confidence level with a cosmic slowing down of the acceleration at
late times for most of the parameterizations. The constraints of the joint
analysis using WMAP and Planck measurements show that this trend disappears. We
have confirmed that the probe provides competitive constraints on the
dark energy parameters when a is assumed.Comment: 21 pages, 8 Tables, 11 Figures, accepted for publication in MNRA
A magnified glance into the dark sector: probing cosmological models with strong lensing in A1689
In this paper we constrain four alternative models to the late cosmic
acceleration in the Universe: Chevallier-Polarski-Linder (CPL), interacting
dark energy (IDE), Ricci holographic dark energy (HDE), and modified polytropic
Cardassian (MPC). Strong lensing (SL) images of background galaxies produced by
the galaxy cluster Abell are used to test these models. To perform this
analysis we modify the LENSTOOL lens modeling code. The value added by this
probe is compared with other complementary probes: Type Ia supernovae (SNIa),
baryon acoustic oscillations (BAO), and cosmic microwave background (CMB). We
found that the CPL constraints obtained of the SL data are consistent with
those estimated using the other probes. The IDE constraints are consistent with
the complementary bounds only if large errors in the SL measurements are
considered. The Ricci HDE and MPC constraints are weak but they are similar to
the BAO, SNIa and CMB estimations. We also compute the figure-of-merit as a
tool to quantify the goodness of fit of the data. Our results suggest that the
SL method provides statistically significant constraints on the CPL parameters
but weak for those of the other models. Finally, we show that the use of the SL
measurements in galaxy clusters is a promising and powerful technique to
constrain cosmological models. The advantage of this method is that
cosmological parameters are estimated by modelling the SL features for each
underlying cosmology. These estimations could be further improved by SL
constraints coming from other galaxy clusters.Comment: 13 pages, 5 figures, accepted for publication in Ap
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