Inflation and Nonsingular Spacetimes of Cosmic Strings

TL;DR

This paper explores how cosmic strings can induce inflationary behavior in spacetime, leading to nonsingular solutions at high symmetry-breaking scales, contrasting with previously known singular static solutions.

Contribution

It demonstrates that cosmic gauge and global strings can cause inflation and produce nonsingular spacetimes at supercritical symmetry-breaking scales, supported by numerical solutions.

Findings

Strings undergo inflation along radial and axial directions at high scales

Nonsingular spacetimes are possible around supercritical strings

Contrasts with earlier singular static solutions

Abstract

Inflation of cosmic gauge and global strings is investigated by numerically solving the combined Einstein and field equations. Above some critical symmetry-breaking scales, the strings undergo inflation along the radial direction as well as the axial direction at the core. The nonsingular nature of the spacetimes around supercritical gauge and global strings is discussed and contrasted to the singular static solutions that have been discussed in the literature.