Phase-transition sound of inflation at gravitational waves detectors

Abstract

It is well-known that the first-order phase transition (PT) will yield a stochastic gravitational waves (GWs) background with a logo-like spectrum. However, we show that when such a PT happened during the primordial inflation, the GWs spectrum brought by the PT will be reddened, which thus records the unique voiceprint of inflation. We assess the abilities of the GW detectors to detect the corresponding signal.

arXiv comment12 pages, 6 figures

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• Broken blue-tilted inflationary gravitational waves: a joint analysis of NANOGrav 15-year and BICEP/Keck 2018 data
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• Traces of a Heavy Field in Gravitational Waves
• Gravitational Wave From Axion-like Particle Inflation
• Crescendo Beyond the Horizon: More Gravitational Waves from Domain Walls Bounded by Inflated Cosmic Strings
• Simulating first-order phase transition during inflation