The stochastic gravitational wave background from close hyperbolic encounters of primordial black holes in dense clusters
Entity
UAM. Departamento de Física TeóricaPublisher
ElsevierDate
2022-06-01Citation
10.1016/j.dark.2022.101009
Physics of the Dark Universe 36 (2022): 101009
ISSN
2212-6864 (onlilne)DOI
10.1016/j.dark.2022.101009Funded by
The authors acknowledge support from the Research Project PGC2018-094773-B-C32 [MINECO-FEDER], and the Centro de Excelencia Severo Ochoa Program SEV-2016-0597. S.J. is supported by the FPI grant PRE2019-088741 funded by MCIN/AEI/10.13039/501100011033. S.K. is supported by the Atracción de Talento contract no. 2019-T1/TIC-13177 granted by the Comunidad de Madrid and Japan Society for the Promotion of Science (JSPS) KAKENHI Grant no. 20H01899 and 20H05853. We would like to thank the referee for useful comments on the manuscriptProject
Gobierno de España. PGC2018-094773-B-C32Editor's Version
https://doi.org/10.1016/j.dark.2022.101009Subjects
Gravitational waves; Hyperbolic encounters; Primordial black holes; Stochastic background; FísicaRights
© 2022 The Author(s)Esta obra está bajo una licencia de Creative Commons Reconocimiento-NoComercial-SinObraDerivada 4.0 Internacional.
Abstract
The inner part of dense clusters of primordial black holes is an active environment where multiple scattering processes take place. Some of them give rise from time to time to bounded pairs, and the rest ends up with a single scattering event. The former eventually evolves to a binary black hole (BBH) emitting periodic gravitational waves (GWs), while the latter with a short distance, called close hyperbolic encounters (CHE), emits a strong GW burst. We make the first calculation of the stochastic GW background originating from unresolved CHE sources. Unlike the case for BBH, the low-frequency tail of the SGWB from CHE is sensitive to the redshift dependence of the event rate, which could help distinguish the astrophysical from the primordial black hole contributions. We find that there is a chance that CHE can be tested by third-generation ground-based GW detectors such as Einstein Telescope and Cosmic Explorer
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Google Scholar:García-Bellido Capdevila, Juan
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Jaraba Gómez, Santiago
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Kuroyanagi, Sachiko
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