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