130 citations · 1.1k across the 52 of their papers we have counts for
4 papers · 1 filter
Nonparametric reconstruction of dynamical dark energy via observational Hubble parameter data
Hao-Ran Yu, Shuo Yuan, Tong-Jie Zhang
We study the power of current and future observational Hubble parameter data (OHD) on non-parametric estimations of the dark energy equation of state, . We propose a new meth…
Method for Direct Measurement of Cosmic Acceleration by 21-cm Absorption Systems
Hao-Ran Yu, Tong-Jie Zhang, Ue-Li Pen
So far there is only indirect evidence that the Universe is undergoing an accelerated expansion. The evidence for cosmic acceleration is based on the observation of different objec…
An improved method to test the Distance--Duality relation
Xi Yang, Hao-Ran Yu, Zhi-Song Zhang +1
Many researchers have performed cosmological-model-independent tests for the distance duality (DD) relation. Theoretical work has been conducted based on the results of these tests…
Constraining smoothness parameter and the DD relation of Dyer-Roeder equation with supernovae
Xi Yang, Hao-Ran Yu, Tong-Jie Zhang
Our real universe is locally inhomogeneous. Dyer and Roeder introduced the smoothness parameter to describe the influence of local inhomogeneity on angular diameter distance, a…