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Exploring the evolution of color-luminosity parameter $eta$ and its effects on parameter estimation | | Shuang Wang
; Yun-He Li
; Xin Zhang
; | | Date: |
23 Oct 2013 | | Abstract: | In Phys. Rev. D 88, 043511 (2013), using the Supernova Legacy Survey Three
Year (SNLS3) data, Wang & Wang found that there is a strong evidence for the
redshift-evolution of color-luminosity parameter $eta$. In this paper, using
three simplest dark energy models ($Lambda$CDM, $w$CDM, and CPL), we further
explore the evolution of $eta$ and its effects on parameter estimation. In
addition to the SNLS3 data, we also take into account the Planck distance
priors data, as well as the latest galaxy clustering (GC) data extracted from
SDSS DR7 and BOSS. We find that, for all the models, $eta$ deviates from a
constant at 5$sigma$ confidence levels. Moreover, adding a parameter of
$eta$ can reduce the best-fit values of $chi^2$ by $sim$ 35, showing the
importance of considering the evolution of $eta$ in the cosmology-fits. We
find that, using the SNLS3 data alone, varying $eta$ yields a larger
$Omega_m$ for the $Lambda$CDM model; using the SNLS3+CMB+GC data, varying
$eta$ yields a larger $Omega_m$ and a smaller $h$ for all the models.
Moreover, we find that these results are much closer to those given by the
CMB+GC data, compared to the cases of treating $eta$ as a constant. This
indicates that considering the evolution of $eta$ is very helpful for
reducing the tension between supernova and other cosmological observations. | | Source: | arXiv, 1310.6109 | | Services: | Forum | Review | PDF | Favorites | |
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