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Subtracting compact binary foreground sources to reveal primordial gravitational-wave backgrounds

Sachdev, Surabhi, Regimbau, Tania and Sathyaprakash, B. S. ORCID: 2020. Subtracting compact binary foreground sources to reveal primordial gravitational-wave backgrounds. Physical Review D 102 (2) , 024051. 10.1103/PhysRevD.102.024051

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Detection of primordial gravitational-wave backgrounds generated during the early Universe phase transitions is a key science goal for future ground-based detectors. The rate of compact binary mergers is so large that their cosmological population produces a confusion background that could masquerade the detection of potential primordial stochastic backgrounds. In this paper, we study the ability of current and future detectors to resolve the confusion background to reveal interesting primordial backgrounds. The current detector network of LIGO and Virgo and the upcoming KAGRA and LIGO-India will not be able to resolve the cosmological compact binary source population, and its sensitivity to stochastic background will be limited by the confusion background of these sources. We find that a network of three (and five) third generation (3G) detectors of Cosmic Explorer and Einstein Telescope will resolve the confusion background produced by binary black holes leaving only about 1.3% (respectively, 0.075%) unresolved; in contrast, as many as 25% (respectively, 7.7%) of binary neutron star sources remain unresolved. Consequently, the binary black hole population will likely not limit observation of primordial backgrounds, but the binary neutron star population will limit the sensitivity of 3G detectors to Ω GW ∼ 10 − 11 at 10 Hz (respectively, Ω GW ∼ 3 × 10 − 12 ).

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: American Physical Society
ISSN: 2470-0010
Date of First Compliant Deposit: 31 July 2020
Date of Acceptance: 9 June 2020
Last Modified: 04 May 2023 23:43

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