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Gravitational wave production right after a primordial black hole evaporation

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Title
Gravitational wave production right after a primordial black hole evaporation
Author(s)
Keisuke Inomata; Masahiro Kawasaki; Kyohei Mukaida; Takahiro Terada; Tsutomu T. Yanagida
Subject
BARYOGENESIS, ; CONSTRAINTS, ; INFLATION
Publication Date
2020-06
Journal
PHYSICAL REVIEW D, v.101, no.12, pp.123533
Publisher
AMER PHYSICAL SOC
Abstract
© 2020 American Physical Society. We discuss the footprint of evaporation of primordial black holes (PBHs) on stochastic gravitational waves (GWs) induced by scalar perturbations. We consider the case where PBHs once dominated the Universe but eventually evaporated before the big bang nucleosynthesis. The reheating through the PBH evaporation could end with a sudden change in the equation of state of the Universe compared to the conventional reheating caused by particle decay. We show that this "sudden reheating" by the PBH evaporation enhances the induced GWs, whose amount depends on the length of the PBH-dominated era and the width of the PBH mass function. We explore the possibility to constrain the primordial abundance of the evaporating PBHs by observing the induced GWs. We find that the abundance parameter beta greater than or similar to 10(-5) - 10(-8) for O(10(3) - 10(5)) PBHs can be constrained by future GW observations if the width of the mass function is smaller than about a hundredth of the mass
URI
https://pr.ibs.re.kr/handle/8788114/7813
DOI
10.1103/PhysRevD.101.123533
ISSN
2470-0010
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > 1. Journal Papers (저널논문)
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