Introduction

Auclair, Isabelle; Ezquerro, Lorena Suelves; Tanguay, Dominique

doi:10.2307/j.ctv1g244rt.4

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“…Closed loops of NG strings loose energy slowly by radiating gravitational waves, and as a result NG string networks contain numerous loops whose decay generate a stochastic gravitational wave background (SGWB) ranging over a wide range of frequencies [1]. Depending on the details of the particular cosmic string model, the corresponding constraints on the dimensionless string tension Gµ from the SGWB are Gµ < ∼ 10 −7 at LIGO-Virgo frequencies [4], Gµ < ∼ 10 −11 at Pulsar frequencies [5], whereas at LISA frequencies one expects to reach Gµ < ∼ 10 −17 [6]. On the other hand, at a more fundamental level, cosmic strings are topological solutions of field theories.…”

Section: Introductionmentioning

confidence: 99%

Particle emission and gravitational radiation from cosmic strings: Observational constraints

2020

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We account for particle emission and gravitational radiation from cosmic string loops to determine their effect on the loop distribution and observational signatures of strings. The effect of particle emission is that the number density of loops no longer scales. This results in a high frequency cutoff on the stochastic gravitational wave background, but we show that the expected cutoff is outside the range of current and planned detectors. Particle emission from string loops also produces a diffuse gamma ray background that is sensitive to the presence of kinks and cusps on the loops. However, both for kinks and cusps, and with mild assumptions about particle physics interactions, current diffuse gamma-ray background observations do not constrain Gµ.

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Section: Introductionmentioning

confidence: 99%