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. [ABSTRACT FROM AUTHOR]