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Comment on the article "Anisotropies in the astrophysical gravitational-wave background: The impact of black hole distributions" by A.C. Jenkins et al. [arXiv:1810.13435]

Cusin, G., Dvorkin, I., Pitrou, C., & Uzan, J.-P. (in preparation). Comment on the article "Anisotropies in the astrophysical gravitational-wave background: The impact of black hole distributions" by A.C. Jenkins et al. [arXiv:1810.13435].

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Creators:
Cusin, Giulia, Author
Dvorkin, Irina1, Author
Pitrou, Cyril, Author
Uzan, Jean-Philippe, Author
Affiliations:
1Astrophysical and Cosmological Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_1933290

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Free keywords: Astrophysics, Cosmology and Extragalactic Astrophysics, astro-ph.CO
Abstract: We investigate the discrepancy pointed out by Jenkins et al. in Ref. [1] between the predictions of anisotropies of the astrophysical gravitational wave (GW) background, derived using different methods in Cusin et al. [2] and in Jenkins et al. [3]. We show that this discrepancy is not due to our treatment of galaxy clustering, contrary to the claim made in Ref. [1] and we show that our modeling of clustering gives results in very good agreement with observations. Furthermore we show that the power law spectrum used in Refs. [1] and [3] to describe galaxy clustering is incorrect on large scales and leads to a different scaling of the multipoles $C_\ell$. Moreover, we also explain that the analytic derivation of the gravitational wave background correlation function in Refs. [1] and [3] is mathematically ill-defined and predicts an amplitude of the angular power spectrum which depends on the (arbitrary) choice of a non-physical cut-off.

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Dates: 2018-11-082018-11-12
Publication Status: Not specified
Pages: 6 pages, 3 figures. Comment about [arXiv:1810.13435], discussion about Limber approximation extended
Publishing info: -
Rev. Method: -
Identifiers: arXiv: 1811.03582
URI: http://arxiv.org/abs/1811.03582
Degree: -

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