804 citations · 6.8k across the 96 of their papers we have counts for
13 papers · 1 filter
Probing the Coupling between Dark Components of the Universe
Zong-Kuan Guo, Nobuyoshi Ohta, Shinji Tsujikawa
We place observational constraints on a coupling between dark energy and dark matter by using 71 Type Ia supernovae (SNe Ia) from the first year of the five-year Supernova Legacy S…
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…
Constraints on the DGP Model from Recent Supernova Observations and Baryon Acoustic Oscillations
Zong-Kuan Guo, Zong-Hong Zhu, J. S. Alcaniz +1
Although there is mounting observational evidence that the expansion of our universe is undergoing a late-time acceleration, the mechanism for this acceleration is yet unknown. In…
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…
Parametrization of K-essence and Its Kinetic Term
Hui Li, Zong-Kuan Guo, Yuan-Zhong Zhang
We construct the non-canonical kinetic term of a k-essence field directly from the effective equation of state function , which describes the properties of the dark energy.…