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Cosmological Models and Latest Observational Data
Hao Wei
In this note, we consider the observational constraints on some cosmological models by using the 307 Union type Ia supernovae (SNIa), the 32 calibrated Gamma-Ray Bursts (GRBs) at $…
Reconstructing the Cosmic Expansion History up to Redshift z=6.29 with the Calibrated Gamma-Ray Bursts
Hao Wei, Shuang Nan Zhang
Recently, Gamma-Ray Bursts (GRBs) were proposed to be a complementary cosmological probe to type Ia supernovae (SNIa). GRBs have been advocated to be standard candles since several…
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…