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Universe 2017, 3(2), 40; doi:10.3390/universe3020040

A Review of Gravitational Waves from Cosmic Domain Walls

Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany
Academic Editor: Lorenzo Iorio
Received: 7 March 2017 / Revised: 20 April 2017 / Accepted: 26 April 2017 / Published: 5 May 2017
(This article belongs to the Special Issue Gravitational Waves: Prospects after the First Direct Detections)
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Abstract

In this contribution, we discuss the cosmological scenario where unstable domain walls are formed in the early universe and their late-time annihilation produces a significant amount of gravitational waves. After describing cosmological constraints on long-lived domain walls, we estimate the typical amplitude and frequency of gravitational waves observed today. We also review possible extensions of the standard model of particle physics that predict the formation of unstable domain walls and can be probed by observation of relic gravitational waves. It is shown that recent results of pulser timing arrays and direct detection experiments partially exclude the relevant parameter space, and that a much wider parameter space can be covered by the next generation of gravitational wave observatories. View Full-Text
Keywords: primordial gravitational waves; physics of the early universe; domain walls; particle physics beyond the standard model primordial gravitational waves; physics of the early universe; domain walls; particle physics beyond the standard model
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Saikawa, K. A Review of Gravitational Waves from Cosmic Domain Walls. Universe 2017, 3, 40.

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