Crossing of the Phantom Divided Barrier with Lorentz Invariance Violating Fields

TL;DR

This paper investigates how Lorentz invariance violation, introduced via a vector field, enables a scalar field to cross the phantom divide in dark energy models, offering new insights into cosmic acceleration.

Contribution

It demonstrates that Lorentz invariance violation allows a single scalar field to cross the phantom divide, controlled by a vector field, which is a novel mechanism in dark energy modeling.

Findings

Equation of state can cross the phantom divide with suitable parameters.

Lorentz violating vector field controls the crossing behavior.

Single scalar field suffices for crossing in this model.

Abstract

We study possible crossing of the phantom divided barrier in a Lorentz invariance violating dark energy model. Lorentz invariance violation which is achieved by introducing a vector field in the action, incorporates directly in the dynamics of the scalar field and equation of state. This interesting feature allows us to study phantom divided barrier crossing in the context of Lorentz invariance violation. We show that for suitable choice of parameter space, equation of state can cross phantom divided barrier just by one scalar field and Lorentz violating vector field controls this crossing.