Has NANOGrav Found First Evidence for Cosmic Strings?

The North American Nanohertz Observatory for Gravitational Waves has recently reported strong evidence for a stochastic common-spectrum process affecting the pulsar timing residuals in its 12.5-year data set. We demonstrate that this process admits an interpretation in terms of a stochastic gravitat...

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Veröffentlicht in:Physical review letters 2021-01, Vol.126 (4), p.041305-041305, Article 041305
Hauptverfasser: Blasi, Simone, Brdar, Vedran, Schmitz, Kai
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container_title Physical review letters
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creator Blasi, Simone
Brdar, Vedran
Schmitz, Kai
description The North American Nanohertz Observatory for Gravitational Waves has recently reported strong evidence for a stochastic common-spectrum process affecting the pulsar timing residuals in its 12.5-year data set. We demonstrate that this process admits an interpretation in terms of a stochastic gravitational-wave background emitted by a cosmic-string network in the early Universe. We study stable Nambu-Goto strings in dependence of their tension Gμ and loop size α and show that the entire viable parameter space will be probed by an array of future experiments.
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source American Physical Society Journals; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals
subjects Gravitation
Gravitational waves
Pulsars
Strings
title Has NANOGrav Found First Evidence for Cosmic Strings?
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