Straight spinning cosmic strings in Brans-Dicke gravity

TL;DR

This paper presents an exact solution for spinning cosmic strings in Brans-Dicke gravity, analyzes closed timelike curves, stability, and explores potential astrophysical implications for galaxy rotation curves.

Contribution

It introduces a new exact solution for spinning cosmic strings in Brans-Dicke theory and examines conditions preventing closed timelike curves and their relevance to galaxy rotation.

Findings

Existence of solutions without closed timelike curves.

Stability of the topological defect configuration.

Potential relevance to galactic rotation curves.

Abstract

It is presented an exact solution of straight spinning cosmic strings in Brans-Dicke theory of gravitation. The possibility of the existence of closed timelike curves around these cosmic strings is analyzed. Furthermore, the stability about the formation of the topological defect discussed here is checked. It is shown the existence of a suitable choice for the integration constants in which closed timelike curves are not allowed. We also verify if it is possible that the obtained spacetime can be the source that describes the observed rotational curves in some galaxies.