Self-Interactions in the Spacetime of a Scalar-Tensor Cosmic String

TL;DR

This paper investigates how scalar-tensor cosmic string spacetime geometry influences electric and magnetic fields, revealing that dilatonic coupling creates effects similar to currents and leads to forbidden regions near the string.

Contribution

It demonstrates the impact of scalar-tensor gravity on electromagnetic fields around cosmic strings, highlighting effects caused by dilatonic coupling.

Findings

Dilatonic coupling induces effects akin to current flow.

Forbidden regions appear near the cosmic string due to scalar-tensor effects.

Electromagnetic fields are significantly affected by the spacetime geometry.

Abstract

We study the effect of the geometry and topology of a scalar-tensor cosmic string space-time on the electric and magnetic fields of line sources. It is shown that the dilatonic coupling of the gravity induces effects along the string comparable to a current flow allowing for forbidden regions near the string.