Global monopoles and massless dilatons in Einstein-Cartan gravity

TL;DR

This paper explores the interaction of global monopoles with massless dilatons within Einstein-Cartan gravity, revealing a repulsive gravitational effect and limitations of linear approximation due to torsion effects.

Contribution

It presents a linearized solution for a global monopole interacting with a massless dilaton in Einstein-Cartan gravity, highlighting the role of torsion and gravitational behavior.

Findings

Monopole-dilaton system generates a repulsive gravitational field.

Cartan torsion does not interact with the monopole Higgs field.

Linear approximation breaks down for certain torsion values.

Abstract

A global monopole in dilatonic Einstein-Cartan gravity is presented. A linearized solution representing a global monopole interacting with a massless dilaton is found where Cartan torsion does not interact with the monopole Higgs field.Computation of the geodesic equation shows that the monopole-dilaton system generates a repulsive gravitational field.The solution is shown to break the linear approximation for certain values of torsion.