540 citations · 1.2k across the 9 of their papers we have counts for
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How to Distinguish Dark Energy and Modified Gravity?
Hao Wei, Shuang Nan Zhang
The current accelerated expansion of our universe could be due to an unknown energy component (dark energy) or a modification to general relativity (modified gravity). In the liter…
Growth Index of DGP Model and Current Growth Rate Data
Hao Wei
Recently, some efforts focus on differentiating dark energy and modified gravity with the growth function . In the literature, it is useful to parameterize the growth rate $f…
Age constraints on the Agegraphic Dark Energy Model
Yi Zhang, Hui Li, Xing Wu +2
We investigate the age constraint on the agegraphic dark energy model by using two old galaxies (LBDS 53W091 and LBDS 53W069) and the old high redshift quasar APM 08279+5255. We fi…
Cosmological Constraints on New Agegraphic Dark Energy
Hao Wei, Rong-Gen Cai
In this work, we consider the cosmological constraints on the new agegraphic dark energy (NADE) proposed in arXiv:0708.0884, by using the observational data of type Ia supernovae (…
A New Model of Agegraphic Dark Energy
Hao Wei, Rong-Gen Cai
In this note, we propose a new model of agegraphic dark energy based on the Károlyházy relation, where the time scale is chosen to be the conformal time of the Friedmann-Robert…
Age Problem in the Holographic Dark Energy Model
Hao Wei, Shuang Nan Zhang
In this note, we test the original holographic dark energy model with some old high redshift objects. The main idea is very simple: the universe cannot be younger than its constitu…