Cosmic String in Scalar-Tensor Gravities

TL;DR

This paper investigates the gravitational effects of a cosmic string within scalar-tensor theories, deriving its metric and analyzing how particles and light propagate in this background, revealing similarities to wiggly strings in General Relativity.

Contribution

It provides the first derivation of the cosmic string metric in scalar-tensor gravity and analyzes particle and light propagation in this context.

Findings

Cosmic string metric derived in scalar-tensor gravity

Propagation of particles and light shows features similar to wiggly strings in GR

Weak-field approximation used for analysis

Abstract

We consider a local cosmic string described by the Abelian-Higgs model in the framework of scalar-tensor gravities. We find the metric of the cosmic string in the weak-field approximation. The propagation of particles and light is analysed in this background. This analysis shows that the (unperturbed) cosmic string in scalar-tensor theories presents some analogous features to the wiggly cosmic string in General Relativity.