| | |
| | |
Stat |
Members: 3643 Articles: 2'487'895 Articles rated: 2609
29 March 2024 |
|
| | | |
|
Article overview
| |
|
Utility of observational Hubble parameter data on dark energy evolution | Xiao-Lei Meng
; Xin Wang
; Shi-Yu Li
; Tong-Jie Zhang
; | Date: |
9 Jul 2015 | Abstract: | Aiming at exploring the nature of dark energy, we use thirty-six
observational Hubble parameter data (OHD) in the redshift range $0 leqslant z
leqslant 2.36$ to make a cosmological model-independent test of the two-point
$Omh^2(z_{2};z_{1})$ diagnostic. In $Lambda$CDM, we have $Omh^2 equiv
Omega_{m}h^2$, where $Omega_{m}$ is the matter density parameter at present.
We bin all the OHD into four data points to mitigate the observational
contaminations. By comparing with the value of $Omega_{m}h^2$ which is
constrained tightly by the Planck observations, our results show that in all
six testing pairs of $Omh^2$ there are two testing pairs are consistent with
$Lambda$CDM at $1sigma$ confidence level (CL), whereas for another two of
them $Lambda$CDM can only be accommodated at $2sigma$ CL. Particularly, for
remaining two pairs, $Lambda$CDM is not compatible even at $2sigma$ CL.
Therefore it is reasonable that although deviations from $Lambda$CDM exist for
some pairs, cautiously, we cannot rule out the validity of $Lambda$CDM. We
further apply two methods to derive the value of Hubble constant $H_0$
utilizing the two-point $Omh^2(z_{2};z_{1})$ diagnostic. We obtain $H_0 =
71.23pm1.54$ ${mathrm{km s^{-1} Mpc^{-1}}}$ from inverse variance
weighted $Omh^2$ value (method (I)) and $H_0 = 69.37pm1.59$ ${mathrm{km
s^{-1} Mpc^{-1}}}$ that the $Omh^2$ value originates from Planck measurement
(method (II)), both at $1sigma$ CL. Finally, we explore how the error in OHD
propagate into $w(z)$ at certain redshift during the reconstruction of $w(z)$.
We argue that the current precision on OHD is not sufficient small to ensure
the reconstruction of $w(z)$ in an acceptable error range, especially at the
low redshift | Source: | arXiv, 1507.2517 | Services: | Forum | Review | PDF | Favorites |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser claudebot
|
| |
|
|
|
| News, job offers and information for researchers and scientists:
| |