Gravitational and Particle Radiation from Cosmic Strings

TL;DR

This paper analytically investigates gravitational and particle radiation from finite-thickness cosmic strings, revealing that their radiation fields induce unavoidable scalar singularities at the symmetry axis.

Contribution

It provides an analytical study showing that radiation from cosmic strings inevitably leads to scalar singularities at the axis, a novel insight into string-induced spacetime behavior.

Findings

Radiation fields cause scalar singularities at the string axis.

Singularities are non-removable and result from non-linear interactions.

The study focuses on finite-thickness straight cosmic strings.

Abstract

Gravitational and massless particle radiation of straight cosmic strings with finite thickness is studied analytically. It is found that the non-linear interaction of the radiation fields emitted by a cosmic string with the ones of the string always makes the spacetime singular at the symmetry axis. The singularity is not removable and is a scalar one.