804 citations · 2.2k across the 18 of their papers we have counts for
13 papers · 1 filter
Direct evidence of acceleration from distance modulus redshift graph
Yungui Gong, Anzhong Wang, Qiang Wu +1
The energy conditions give upper bounds on the luminosity distance. We apply these upper bounds to the 192 essence supernova Ia data to show that the Universe had experienced accel…
Two-Field Quintom Models in the w-w' Plane
Zong-Kuan Guo, Yun-Song Piao, Xinmin Zhang +1
The w-w' plane, defined by the equation of state parameter for the dark energy and its derivative with respect to the logarithm of the scale factor, is useful to the study of class…
Parametrizations of the Dark Energy Density and Scalar Potentials
Zong-Kuan Guo, Nobuyoshi Ohta, Yuan-Zhong Zhang
We develop a theoretical method of constructing the scalar (quintessence or phantom) potential directly from the dimensionless dark energy function X(z), the dark energy density in…
A Tracker Solution for a Holographic Dark Energy Model
Hui Li, Zong-kuan Guo, Yuan-zhong Zhang
We investigate a kind of holographic dark energy model with the future event horizon the IR cutoff and the equation of state -1. In this model, the constraint on the equation of st…
Observational Constraints on Variable Chaplygin Gas
Zong-Kuan Guo, Yuan-Zhong Zhang
We investigate observational constraints on the variable Chaplygin gas model from the gold sample of type Ia supernova data and the recent measurements of the X-ray gas mass fracti…
Cosmology with a Variable Chaplygin Gas
Zong-Kuan Guo, Yuan-Zhong Zhang
We consider a new generalized Chaplygin gas model that includes the original Chaplygin gas model as a special case. In such a model the generalized Chaplygin gas evolves as from du…