7 papers
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…
Cosmological Evolution of Interacting Phantom Energy with Dark Matter
Zong-Kuan Guo, Rong-Gen Cai, Yuan-Zhong Zhang
We investigate the cosmological evolution of an interacting phantom energy model in which the phantom field has interaction with the dark matter. We discuss the existence and stabi…
Interacting Phantom Energy
Zong-Kuan Guo, Yuan-Zhong Zhang
We investigate the role of a suitable interaction between a matter fluid and a phantom field for the coincidence problem. There exists a stationary scaling solution which is a stab…
Cosmological Evolution of a Quintom Model of Dark Energy
Zong-Kuan Guo, Yun-Song Piao, Xinmin Zhang +1
We investigate in this paper the cosmological evolution of a dark energy model with two scalar fields where one of the scalar has canonical kinetic energy and another scalar has ne…
Acoustic Wormholes
Kamal Kanti Nandi, Yuan-Zhong Zhang, Rong-Gen Cai
Acoustic analogs of static, spherically symmetric massive traversable Lorentzian wormholes are constructed as a {\em formal} extension of acoustic black holes. The method is straig…
A Semiclassical ANEC Constraint On Classical Traversable Lorentzian Wormholes
Kamal K. Nandi, Yuan-Zhong Zhang, Nail G. Migranov
The present article lies at the interface between gravity, a highly nonlinear phenomenon, and quantum field theory. The nonlinear field equations of Einstein permit the theoretical…