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Dancing in the dark: detecting a population of distant primordial black holes

Abstract: Primordial black holes (PBHs) are compact objects proposed to have formed in the early Universe from the collapse of small-scale over-densities. Their existence may be detected from the observation of gravitational waves (GWs) emitted by PBH mergers, if the signals can be distinguished from those produced by the merging of astrophysical black holes. In this work, we forecast the capability of the Einstein Telescope, a proposed third-generation GW observatory, to identify and measure the abundance of a subdominant population of distant PBHs, using the difference in the redshift evolution of the merger rate of the two populations as our discriminant. We carefully model the merger rates and generate realistic mock catalogues of the luminosity distances and errors that would be obtained from GW signals observed by the Einstein Telescope. We use two independent statistical methods to analyse the mock data, finding that, with our more powerful, likelihood-based method, PBH abundances as small as fPBH ? 7 × 10-6 (fPBH ? 2×10-6) would be distinguishable from fPBH = 0 at the level of 3? with a one year (ten year) observing run of the Einstein Telescope. Our mock data generation code, darksirens, is fast, easily extendable and publicly available on GitLab.

 Autoría: Martinelli M., Scarcella F., Hogg N., Kavanagh B., Gaggero D., Fleury P.,

 Fuente: Journal of Cosmology and Astroparticle Physics, 2022, 08, 006

 Editorial: IOP Publishing Ltd and Sissa Medialab

 Año de publicación: 2022

 Nº de páginas: 48

 Tipo de publicación: Artículo de Revista

 DOI: 10.1088/1475-7516/2022/08/006

 ISSN: 1475-7516

Autoría

MARTINELLI, MATTEO

SCARCELLA, FRANCESCA

HOGG, NATALIE B.

BRADLEY JAMES KAVANAGH

GAGGERO, DANIELE

FLEURY, PIERRE