Smooth dynamical (de)-phantomization of a scalar field in simple cosmological models

TL;DR

This paper explores how simple scalar field cosmological models can smoothly transition across the phantom divide line, driven by Einstein equations, including scenarios with a phantom phase of matter.

Contribution

It demonstrates a mechanism for smooth (de)-phantomization in scalar field models, driven dynamically by Einstein equations, expanding understanding of cosmic phase transitions.

Findings

Smooth crossing of the phantom divide line achieved

Different cosmological scenarios including phantom phases sketched

Kinetic term sign change occurs dynamically

Abstract

Simple scalar field cosmological models are considered describing gravity assisted crossing of the phantom divide line. This crossing or (de)-phantomization characterized by the change of the sign of the kinetic term of the scalar field is smooth and driven dynamically by the Einstein equations. Different cosmological scenarios, including the phantom phase of matter are sketched.