Decay of cosmic global string loops

Ayush Saurabh; Tanmay Vachaspati; Levon Pogosian

doi:10.1103/PhysRevD.101.083522

Decay of cosmic global string loops

Ayush Saurabh, Tanmay Vachaspati, Levon Pogosian

CLAS-NS: Physics

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

We numerically study the decay of cosmic global string loops due to radiation of Goldstone bosons and massive scalar (χ) particles. The length of loops we study range from 200 to 1000 times the width of the string core. We find that the lifetime of a loop is ≈1.4L. The energy spectrum of Goldstone boson radiation has a k-1 falloff, where k is the wave number, and a sharp peak at k≈mχ/2, where mχ is the mass of χ. The latter is a new feature and implies a peak at high energies (MeV-GeV) in the cosmological distribution of QCD axions.

Original language	English (US)
Article number	A227
Journal	Physical Review D
Volume	101
Issue number	8
DOIs	https://doi.org/10.1103/PhysRevD.101.083522
State	Published - Apr 15 2020

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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AB - We numerically study the decay of cosmic global string loops due to radiation of Goldstone bosons and massive scalar (χ) particles. The length of loops we study range from 200 to 1000 times the width of the string core. We find that the lifetime of a loop is ≈1.4L. The energy spectrum of Goldstone boson radiation has a k-1 falloff, where k is the wave number, and a sharp peak at k≈mχ/2, where mχ is the mass of χ. The latter is a new feature and implies a peak at high energies (MeV-GeV) in the cosmological distribution of QCD axions.

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