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2021

Stochastic gravitational-wave background from metastable cosmic strings

Buchmuller, Wilfried, Domcke, Valerie, Schmitz, Kai

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A metastable cosmic-string network is a generic consequence of many grand unified theories (GUTs) when combined with cosmic inflation.

Metastable cosmic strings are not topologically stable, but decay on cosmic time scales due to pair production of GUT monopoles.
This leads to a network consisting of metastable long strings on superhorizon scales as well as of string loops and segments on subhorizon scales.
We compute for the first time the complete stochastic gravitational-wave background (SGWB) arising from all these network constituents, including several technical improvements to both the derivation of the loop and segment contributions.

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