Gravitational Wave Bursts as Harbingers of Cosmic Strings Diluted by Inflation

Abstract

A standard expectation of primordial cosmological inflation is that it dilutes all relics created before its onset to unobservable levels. We present a counterexample to this expectation by demonstrating that a network of cosmic strings diluted by inflation can regrow to a level that is potentially observable today in gravitational waves~(GWs). In contrast to undiluted cosmic strings, whose primary GW signals are typically in the form of a stochastic GW background, the leading signal from a diluted cosmic string network can be distinctive bursts of GWs within the sensitivity reach of current and future GW observatories.

9 pages, 5 figures

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• Has NANOGrav found first evidence for cosmic strings?
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• Fingerprint of Low-Scale Leptogenesis in the Primordial Gravitational-Wave Spectrum
• Detection of Early-Universe Gravitational Wave Signatures and Fundamental Physics
• The Science of the Einstein Telescope
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• Gravitational Waves from Global Cosmic Strings and Cosmic Archaeology
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• Cosmic Strings, Inflation, and Gravity Waves
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• Gravitational Waves from Quasi-stable Strings
• Monopoles, Strings and Gravitational Waves in Non-minimal Inflation
• Precision Early Universe Cosmology from Stochastic Gravitational Waves
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• A Predictive $SO(10)$ Model
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• Searching Stochastic Gravitational Wave Background Landscape Across Frequency Bands
• Gravitational Wave Gastronomy
• Probing Leptogenesis and Pre-BBN Universe with Gravitational Waves Spectral Shapes