Primordial gravastar from inflation

Abstract

The dS bubbles can nucleate spontaneously during inflation, and will be stretched by the cosmological expansion to astrophysical scale. We report on a novel phenomenon that such a bubble might develop into a gravastar (an ultra-compact object with a dS core) after inflation, which witnessed the occurrence of inflation and would survive till today. It is pointed out that if a primordial gravastar was involved in one of the LIGO/Virgo gravitational wave (GW) events, the post-merger object could be a gravastar that will eventually collapse into a black hole. As a result, the late-time GW ringdown waveform will exhibit a series of "echoes" with intervals increasing with time.

arXiv comment10 pages, 4 figures

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Cited by in corpus (12)

• Testing the nature of dark compact objects: a status report
• Stable Schwarzschild stars as black-hole mimickers
• Echoes from phantom wormholes
• Echoes from Hairy Black Holes
• Distinguishing Brans-Dicke-Kerr type naked singularities and black holes with their thin disk electromagnetic radiation properties
• Mixing of gravitational wave echoes
• Observational Appearance of a Freely-falling Star in an Asymmetric Thin-shell Wormhole
• On echo intervals in gravitational wave echo analysis
• Implications of GWTC-3 on primordial black holes from vacuum bubbles
• The Fredholm Approach to Charactize Gravitational Wave Echoes
• Exact Gravastar Solution
• On a Class of Exact Arbitrarily Differentiable de Sitter Cores with Kerr Exteriors: Possible gravastar or regular black hole mimickers