Dynamics of a two scalar field cosmological model with phantom terms

Abstract

We perform a detailed analysis of the dynamics of a chiral-like cosmological model where the scalar fields can have negative kinetic terms. In particular, we study the asymptotic dynamics for the gravitational field equations for four different models in a spatially flat Friedmann–Lemaître–Robertson–Walker (FLRW) background space. When one of the scalar fields is phantom, we show that the cosmological fluid can evolves such that the parameter of the equation of state crosses twice the phantom divide line without the appearance of ghosts. Moreover, the cosmological viability of these four models is discussed.