Large parallel cosmic string simulations: New results on loop production

TL;DR

This paper presents the largest cosmic string simulations using advanced parallel computing, revealing the transition from initial non-scaling loop distributions to a true scaling regime with significant large loops across different cosmic eras.

Contribution

It introduces a novel parallel computing technique enabling unprecedented cosmic string simulations and provides new insights into loop production and scaling behavior.

Findings

Confirmation of a non-scaling loop distribution during a transient period

Identification of a true scaling regime with large loops approximately one-twentieth the horizon

Observation of similar behaviors across matter, radiation, and flat space eras

Abstract

Using a new parallel computing technique, we have run the largest cosmic string simulations ever performed. Our results confirm the existence of a long transient period where a non-scaling distribution of small loops is produced at lengths depending on the initial correlation scale. As time passes, this initial population gives way to the true scaling regime, where loops of size approximately equal to one-twentieth the horizon distance become a significant component. We observe similar behavior in matter and radiation eras, as well as in flat space. In the matter era, the scaling population of large loops becomes the dominant component; we expect this to eventually happen in the other eras as well.