Cosmic strings in axionic-dilatonic gravity

TL;DR

This paper investigates cosmic strings within axionic-dilatonic gravity, revealing their singular nature and deriving field expressions at large distances using duality transformations in a supermassive Higgs limit.

Contribution

It introduces a novel analysis of cosmic strings in axionic-dilatonic gravity and applies duality transformations to derive asymptotic field expressions.

Findings

Cosmic strings in this gravity model are singular solutions.

Field expressions at large distances are obtained via duality transformations.

The supermassive Higgs limit simplifies the analysis of the fields.

Abstract

We first consider local cosmic strings in dilaton-axion gravity and show that they are singular solutions. Then we take a supermassive Higgs limit and present expressions for the fields at far distances from the core by applying a Pecci-Quinn and a duality transformation to the dilatonic Melvin's magnetic universe.