Phantom dark energy from scalar$-$torsion coupling

TL;DR

This paper proposes a model where a scalar field coupled to torsion in Einstein-Cartan gravity acts as a source of phantom dark energy due to its negative kinetic term, offering a novel approach to dark energy modeling.

Contribution

It introduces a scalar-torsion coupling in Einstein-Cartan theory that results in a phantom dark energy candidate with a negative kinetic term.

Findings

Scalar field becomes kinetic through coupling to torsion.

The kinetic term is negative, indicating phantom dark energy behavior.

Provides a new theoretical framework for dark energy models.

Abstract

We show that a scalar field without a kinetic term in the Lagrangian density, coupled to the covariant divergence of the torsion vector in the Einstein$-$Cartan theory of gravity, becomes kinetic in its general-relativistic equivalent formulation. The resulting kinetic term is negative: such a scalar field could be a source of phantom dark energy.