Cosmic String Spacetime in Dilaton Gravity and Flat Rotation Curves

TL;DR

This paper explores how cosmic strings in dilaton gravity could explain the observed flat rotation curves of galaxies, linking topological defects to galactic dynamics.

Contribution

It introduces a model connecting cosmic string solutions in dilaton gravity to flat galactic rotation curves, offering a potential alternative to dark matter explanations.

Findings

Cosmic string solutions can produce flat rotation curves.

Dilaton gravity effects influence galactic dynamics.

Vacuum solutions relate to observed galactic phenomena.

Abstract

In dilaton gravity theories, we consider a string-like topological defect formed during U(1) gauge symmetry-breaking phase transition in the early Universe, and far from the cosmic string we have vacuum solutions of the generalized Einstein equation. We discuss how they can be related to the flatness of galactic rotation curves.