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Decay of Cosmic String Loops due to Particle Radiation.

Daiju Matsunami^1,2, Levon Pogosian², Ayush Saurabh³

¹Canadian Institute for Theoretical Astrophysics, University of Toronto, Toronto, Ontario M5S 3H8, Canada.

Physical Review Letters

|June 8, 2019

Summary

This summary is machine-generated.

Cosmic string loops decay primarily through particle emission from kink collisions, with decay time scaling with loop length squared. Gravitational radiation dominates decay for larger loops.

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Area of Science:

Cosmology
Particle Physics
Theoretical Physics

Background:

Cosmic strings are hypothetical topological defects.
Their decay rate influences cosmological constraints.
Abelian-Higgs model provides a framework for studying cosmic strings.

Purpose of the Study:

Investigate the decay mechanisms of cosmic string loops.
Determine the primary energy loss pathways.
Quantify the relationship between decay time and loop length.

Main Methods:

Field theory simulations of cosmic string loop formation and evolution.
Analysis of particle radiation emission.
Comparison of decay times for particle and gravitational radiation.

Main Results:

Particle radiation is emitted mainly via kink collisions.
Decay time due to particle loss scales as L^2 (loop length squared).
Gravitational radiation decay scales as L (loop length).

Conclusions:

Particle emission is the dominant energy loss for small cosmic string loops.
Gravitational radiation becomes the primary decay mechanism for large loops.
These findings refine constraints on cosmic string properties.