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  Mapping the Universe Expansion: Enabling percent-level measurements of the Hubble Constant with a single binary neutron-star merger detection

Bustillo, J. C., Leong, S. H. W., Dietrich, T., & Lasky, P. D. (2021). Mapping the Universe Expansion: Enabling percent-level measurements of the Hubble Constant with a single binary neutron-star merger detection. The Astrophysical Journal Letters, 912(1): L10. doi:10.3847/2041-8213/abf502.

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Bustillo, Juan Calderón, Author
Leong, Samson H. W., Author
Dietrich, Tim1, Author              
Lasky, Paul D., Author
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1Astrophysical and Cosmological Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_1933290              

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Free keywords: General Relativity and Quantum Cosmology, gr-qc,Astrophysics, Cosmology and Extragalactic Astrophysics, astro-ph.CO
 Abstract: The joint observation of the gravitational-wave and electromagnetic signal from the binary neutron-star merger GW170817 allowed for a new independent measurement of the Hubble constant $H_0$, albeit with an uncertainty of about 15\% at 1$\sigma$. Observations of similar sources with a network of future detectors will allow for more precise measurements of $H_0$. These, however, are currently largely limited by the intrinsic degeneracy between the luminosity distance and the inclination of the source in the gravitational-wave signal. We show that the higher-order modes in gravitational waves can be used to break this degeneracy in astrophysical parameter estimation in both the inspiral and post-merger phases of a neutron star merger. We show that for systems at distances similar to GW170817, this method enables percent-level measurements of $H_0$ with a single detection. This would permit the study of time variations and spatial anisotropies of $H_0$ with unprecedented precision. We investigate how different network configurations affect measurements of $H_0$, and discuss the implications in terms of science drivers for the proposed 2.5- and third-generation gravitational-wave detectors. Finally, we show that the precision of $H_0$ measured with these future observatories will be solely limited by redshift measurements of electromagnetic counterparts.

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 Dates: 2020-06-202021-05-082021
 Publication Status: Published in print
 Pages: 12 pages, 5 figures. Version accepted in The Astrophysical Journal Letters
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 Identifiers: arXiv: 2006.11525
DOI: 10.3847/2041-8213/abf502
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Title: The Astrophysical Journal Letters
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Pages: - Volume / Issue: 912 (1) Sequence Number: L10 Start / End Page: - Identifier: -