How to simulate global cosmic strings with large string tension

TL;DR

This paper introduces a novel numerical method to simulate global cosmic string networks with large tensions, effectively capturing the hierarchy of scales without requiring prohibitively large computational resources.

Contribution

The authors develop a new simulation approach that models global string networks with large tension efficiently, overcoming previous computational limitations.

Findings

Successfully simulates global strings with high tension

Captures the scale hierarchy without large lattices

Provides insights into cosmic string dynamics

Abstract

Global string networks may be relevant in axion production in the early Universe, as well as other cosmological scenarios. Such networks contain a large hierarchy of scales between the string core scale and the Hubble scale, log(f/H) around 70, which influences the network dynamics by giving the strings large tensions T = pi f^2 log(f/H). We present a new numerical approach to simulate such global string networks, capturing the tension without an exponentially large lattice.