Constraints on Cosmic Distance Duality Relation from Cosmological
  Observations
  In this paper, we use the model dependent method to revisit the constraint on
the well-known cosmic distance duality relation (CDDR). By using the latest
SNIa samples, such as Union2.1, JLA and SNLS, we find that the SNIa data alone
can not constrain the cosmic opacity parameter $\varepsilon$, which denotes the
deviation from the CDDR, $d_{\rm L} = d_{\rm A}(1+z)^{2+\varepsilon}$, very
well. The constraining power on $\varepsilon$ from the luminosity distance
indicator provided by SNIa and GRB is hardly to be improved at present. When we
include other cosmological observations, such as the measurements of Hubble
parameter, the baryon acoustic oscillations and the distance information from
cosmic microwave background, we obtain the tightest constraint on the cosmic
opacity parameter $\varepsilon$, namely the 68\% C.L. limit:
$\varepsilon=0.023\pm0.018$. Furthermore, we also consider the evolution of
$\varepsilon$ as a function of $z$ using two methods, the parametrization and
the principle component analysis, and do not find the evidence for the
deviation from zero. Finally, we simulate the future SNIa and Hubble
measurements and find the mock data could give very tight constraint on the
cosmic opacity $\varepsilon$ and verify the CDDR at high significance.
