Global dynamics of the hyperbolic Chiral-Phantom model

Understand

We perform a detailed analysis of the asymptotic behavior of a multifield cosmological model with phantom terms.

• Specifically, we consider the Chiral-Phantom model consisting of two scalar fields with a mixed kinetic term, while one scalar field has negative kinetic energy, that is, it has phantom properties.
• We show that the Hubble function can change sign, and we study the global evolution of the field equation in the finite and infinity regions with the use of Poincar\'{e} variables.
• We find that in the Chiral-Phantom model the limit of the quintessence scalar field is recovered while the cosmological evolution differs from the standard hyperbolic theory.