arXiv subjects

Xiao-fei Zhang

Publications and source records attributed to Xiao-fei Zhang.

2 recordsLinked to original sources

arXiv2006

Avoiding the Big-Rip Jeopardy in a Quintom Dark Energy Model with Higher Derivatives

In the framework of a single scalar field quintom model with higher derivative, we construct in this paper a dark energy model of which the equation of state (EOS) $w$ crosses over the cosmological constant boundary. Interestingly during the evolution of the universe $w<-1$ happens just for a period of time with a distinguished feature that $w$ starts with a value above -1, transits into $w<-1$, then comes back to $w>-1$. This avoids the Big Rip jeopardy induced by $w<-1$.

astro-ph↗

arXiv2005

Two-field Models of Dark Energy with Equation of State Across -1

In this paper, we study the possibility of building two-field models of dark energy with equation of state across -1. Specifically we will consider two classes of models: one consists of two scalar fields (Quintessence+Phantom) and another includes one scalar (Phantom) and one spinor field (Neutrino). Our studies indicate to some extent that two-field models give rise to a simple realization of the dynamical dark energy model with the equation of state across $w = -1$.

astro-ph↗